183d290c5STom Rini // SPDX-License-Identifier: GPL-2.0+
29eefe2a2SStefan Roese /*
39eefe2a2SStefan Roese * This file is part of UBIFS.
49eefe2a2SStefan Roese *
59eefe2a2SStefan Roese * Copyright (C) 2006-2008 Nokia Corporation.
69eefe2a2SStefan Roese *
79eefe2a2SStefan Roese * Authors: Artem Bityutskiy (Битюцкий Артём)
89eefe2a2SStefan Roese * Adrian Hunter
99eefe2a2SStefan Roese */
109eefe2a2SStefan Roese
119eefe2a2SStefan Roese /*
129eefe2a2SStefan Roese * This file implements UBIFS initialization and VFS superblock operations. Some
139eefe2a2SStefan Roese * initialization stuff which is rather large and complex is placed at
149eefe2a2SStefan Roese * corresponding subsystems, but most of it is here.
159eefe2a2SStefan Roese */
169eefe2a2SStefan Roese
17ff94bc40SHeiko Schocher #ifndef __UBOOT__
18ff94bc40SHeiko Schocher #include <linux/init.h>
19ff94bc40SHeiko Schocher #include <linux/slab.h>
20ff94bc40SHeiko Schocher #include <linux/module.h>
21ff94bc40SHeiko Schocher #include <linux/ctype.h>
22ff94bc40SHeiko Schocher #include <linux/kthread.h>
23ff94bc40SHeiko Schocher #include <linux/parser.h>
24ff94bc40SHeiko Schocher #include <linux/seq_file.h>
25ff94bc40SHeiko Schocher #include <linux/mount.h>
269eefe2a2SStefan Roese #include <linux/math64.h>
27ff94bc40SHeiko Schocher #include <linux/writeback.h>
28ff94bc40SHeiko Schocher #else
29ff94bc40SHeiko Schocher
306e295186SSimon Glass #include <common.h>
316e295186SSimon Glass #include <malloc.h>
326e295186SSimon Glass #include <memalign.h>
3384b8bf6dSMasahiro Yamada #include <linux/bug.h>
34f8fdb81fSFabio Estevam #include <linux/log2.h>
35ff94bc40SHeiko Schocher #include <linux/stat.h>
36ff94bc40SHeiko Schocher #include <linux/err.h>
37ff94bc40SHeiko Schocher #include "ubifs.h"
38ff94bc40SHeiko Schocher #include <ubi_uboot.h>
39ff94bc40SHeiko Schocher #include <mtd/ubi-user.h>
40ff94bc40SHeiko Schocher
41ff94bc40SHeiko Schocher struct dentry;
42ff94bc40SHeiko Schocher struct file;
43ff94bc40SHeiko Schocher struct iattr;
44ff94bc40SHeiko Schocher struct kstat;
45ff94bc40SHeiko Schocher struct vfsmount;
469eefe2a2SStefan Roese
479eefe2a2SStefan Roese #define INODE_LOCKED_MAX 64
489eefe2a2SStefan Roese
499eefe2a2SStefan Roese struct super_block *ubifs_sb;
50ff94bc40SHeiko Schocher
519eefe2a2SStefan Roese static struct inode *inodes_locked_down[INODE_LOCKED_MAX];
529eefe2a2SStefan Roese
set_anon_super(struct super_block * s,void * data)53ff94bc40SHeiko Schocher int set_anon_super(struct super_block *s, void *data)
549eefe2a2SStefan Roese {
559eefe2a2SStefan Roese return 0;
569eefe2a2SStefan Roese }
579eefe2a2SStefan Roese
iget_locked(struct super_block * sb,unsigned long ino)589eefe2a2SStefan Roese struct inode *iget_locked(struct super_block *sb, unsigned long ino)
599eefe2a2SStefan Roese {
609eefe2a2SStefan Roese struct inode *inode;
619eefe2a2SStefan Roese
624519668bSMarcel Ziswiler inode = (struct inode *)malloc_cache_aligned(
634519668bSMarcel Ziswiler sizeof(struct ubifs_inode));
649eefe2a2SStefan Roese if (inode) {
659eefe2a2SStefan Roese inode->i_ino = ino;
669eefe2a2SStefan Roese inode->i_sb = sb;
679eefe2a2SStefan Roese list_add(&inode->i_sb_list, &sb->s_inodes);
689eefe2a2SStefan Roese inode->i_state = I_LOCK | I_NEW;
699eefe2a2SStefan Roese }
709eefe2a2SStefan Roese
719eefe2a2SStefan Roese return inode;
729eefe2a2SStefan Roese }
739eefe2a2SStefan Roese
iget_failed(struct inode * inode)74ff94bc40SHeiko Schocher void iget_failed(struct inode *inode)
75ff94bc40SHeiko Schocher {
76ff94bc40SHeiko Schocher }
77ff94bc40SHeiko Schocher
ubifs_iput(struct inode * inode)789eefe2a2SStefan Roese int ubifs_iput(struct inode *inode)
799eefe2a2SStefan Roese {
809eefe2a2SStefan Roese list_del_init(&inode->i_sb_list);
819eefe2a2SStefan Roese
829eefe2a2SStefan Roese free(inode);
839eefe2a2SStefan Roese return 0;
849eefe2a2SStefan Roese }
859eefe2a2SStefan Roese
869eefe2a2SStefan Roese /*
879eefe2a2SStefan Roese * Lock (save) inode in inode array for readback after recovery
889eefe2a2SStefan Roese */
iput(struct inode * inode)899eefe2a2SStefan Roese void iput(struct inode *inode)
909eefe2a2SStefan Roese {
919eefe2a2SStefan Roese int i;
929eefe2a2SStefan Roese struct inode *ino;
939eefe2a2SStefan Roese
949eefe2a2SStefan Roese /*
959eefe2a2SStefan Roese * Search end of list
969eefe2a2SStefan Roese */
979eefe2a2SStefan Roese for (i = 0; i < INODE_LOCKED_MAX; i++) {
989eefe2a2SStefan Roese if (inodes_locked_down[i] == NULL)
999eefe2a2SStefan Roese break;
1009eefe2a2SStefan Roese }
1019eefe2a2SStefan Roese
1029eefe2a2SStefan Roese if (i >= INODE_LOCKED_MAX) {
1030195a7bbSHeiko Schocher dbg_gen("Error, can't lock (save) more inodes while recovery!!!");
1049eefe2a2SStefan Roese return;
1059eefe2a2SStefan Roese }
1069eefe2a2SStefan Roese
1079eefe2a2SStefan Roese /*
1089eefe2a2SStefan Roese * Allocate and use new inode
1099eefe2a2SStefan Roese */
1104519668bSMarcel Ziswiler ino = (struct inode *)malloc_cache_aligned(sizeof(struct ubifs_inode));
1119eefe2a2SStefan Roese memcpy(ino, inode, sizeof(struct ubifs_inode));
1129eefe2a2SStefan Roese
1139eefe2a2SStefan Roese /*
1149eefe2a2SStefan Roese * Finally save inode in array
1159eefe2a2SStefan Roese */
1169eefe2a2SStefan Roese inodes_locked_down[i] = ino;
1179eefe2a2SStefan Roese }
1189eefe2a2SStefan Roese
119ff94bc40SHeiko Schocher /* from fs/inode.c */
120ff94bc40SHeiko Schocher /**
121ff94bc40SHeiko Schocher * clear_nlink - directly zero an inode's link count
122ff94bc40SHeiko Schocher * @inode: inode
123ff94bc40SHeiko Schocher *
124ff94bc40SHeiko Schocher * This is a low-level filesystem helper to replace any
125ff94bc40SHeiko Schocher * direct filesystem manipulation of i_nlink. See
126ff94bc40SHeiko Schocher * drop_nlink() for why we care about i_nlink hitting zero.
127ff94bc40SHeiko Schocher */
clear_nlink(struct inode * inode)128ff94bc40SHeiko Schocher void clear_nlink(struct inode *inode)
129ff94bc40SHeiko Schocher {
130ff94bc40SHeiko Schocher if (inode->i_nlink) {
131ff94bc40SHeiko Schocher inode->__i_nlink = 0;
132ff94bc40SHeiko Schocher atomic_long_inc(&inode->i_sb->s_remove_count);
133ff94bc40SHeiko Schocher }
134ff94bc40SHeiko Schocher }
135ff94bc40SHeiko Schocher EXPORT_SYMBOL(clear_nlink);
136ff94bc40SHeiko Schocher
137ff94bc40SHeiko Schocher /**
138ff94bc40SHeiko Schocher * set_nlink - directly set an inode's link count
139ff94bc40SHeiko Schocher * @inode: inode
140ff94bc40SHeiko Schocher * @nlink: new nlink (should be non-zero)
141ff94bc40SHeiko Schocher *
142ff94bc40SHeiko Schocher * This is a low-level filesystem helper to replace any
143ff94bc40SHeiko Schocher * direct filesystem manipulation of i_nlink.
144ff94bc40SHeiko Schocher */
set_nlink(struct inode * inode,unsigned int nlink)145ff94bc40SHeiko Schocher void set_nlink(struct inode *inode, unsigned int nlink)
146ff94bc40SHeiko Schocher {
147ff94bc40SHeiko Schocher if (!nlink) {
148ff94bc40SHeiko Schocher clear_nlink(inode);
149ff94bc40SHeiko Schocher } else {
150ff94bc40SHeiko Schocher /* Yes, some filesystems do change nlink from zero to one */
151ff94bc40SHeiko Schocher if (inode->i_nlink == 0)
152ff94bc40SHeiko Schocher atomic_long_dec(&inode->i_sb->s_remove_count);
153ff94bc40SHeiko Schocher
154ff94bc40SHeiko Schocher inode->__i_nlink = nlink;
155ff94bc40SHeiko Schocher }
156ff94bc40SHeiko Schocher }
157ff94bc40SHeiko Schocher EXPORT_SYMBOL(set_nlink);
158ff94bc40SHeiko Schocher
159ff94bc40SHeiko Schocher /* from include/linux/fs.h */
i_uid_write(struct inode * inode,uid_t uid)160ff94bc40SHeiko Schocher static inline void i_uid_write(struct inode *inode, uid_t uid)
161ff94bc40SHeiko Schocher {
162ff94bc40SHeiko Schocher inode->i_uid.val = uid;
163ff94bc40SHeiko Schocher }
164ff94bc40SHeiko Schocher
i_gid_write(struct inode * inode,gid_t gid)165ff94bc40SHeiko Schocher static inline void i_gid_write(struct inode *inode, gid_t gid)
166ff94bc40SHeiko Schocher {
167ff94bc40SHeiko Schocher inode->i_gid.val = gid;
168ff94bc40SHeiko Schocher }
169ff94bc40SHeiko Schocher
unlock_new_inode(struct inode * inode)170ff94bc40SHeiko Schocher void unlock_new_inode(struct inode *inode)
171ff94bc40SHeiko Schocher {
172ff94bc40SHeiko Schocher return;
173ff94bc40SHeiko Schocher }
174ff94bc40SHeiko Schocher #endif
175ff94bc40SHeiko Schocher
176ff94bc40SHeiko Schocher /*
177ff94bc40SHeiko Schocher * Maximum amount of memory we may 'kmalloc()' without worrying that we are
178ff94bc40SHeiko Schocher * allocating too much.
179ff94bc40SHeiko Schocher */
180ff94bc40SHeiko Schocher #define UBIFS_KMALLOC_OK (128*1024)
181ff94bc40SHeiko Schocher
182ff94bc40SHeiko Schocher /* Slab cache for UBIFS inodes */
183ff94bc40SHeiko Schocher struct kmem_cache *ubifs_inode_slab;
184ff94bc40SHeiko Schocher
185ff94bc40SHeiko Schocher #ifndef __UBOOT__
186ff94bc40SHeiko Schocher /* UBIFS TNC shrinker description */
187ff94bc40SHeiko Schocher static struct shrinker ubifs_shrinker_info = {
188ff94bc40SHeiko Schocher .scan_objects = ubifs_shrink_scan,
189ff94bc40SHeiko Schocher .count_objects = ubifs_shrink_count,
190ff94bc40SHeiko Schocher .seeks = DEFAULT_SEEKS,
191ff94bc40SHeiko Schocher };
192ff94bc40SHeiko Schocher #endif
193ff94bc40SHeiko Schocher
194ff94bc40SHeiko Schocher /**
195ff94bc40SHeiko Schocher * validate_inode - validate inode.
196ff94bc40SHeiko Schocher * @c: UBIFS file-system description object
197ff94bc40SHeiko Schocher * @inode: the inode to validate
198ff94bc40SHeiko Schocher *
199ff94bc40SHeiko Schocher * This is a helper function for 'ubifs_iget()' which validates various fields
200ff94bc40SHeiko Schocher * of a newly built inode to make sure they contain sane values and prevent
201ff94bc40SHeiko Schocher * possible vulnerabilities. Returns zero if the inode is all right and
202ff94bc40SHeiko Schocher * a non-zero error code if not.
203ff94bc40SHeiko Schocher */
validate_inode(struct ubifs_info * c,const struct inode * inode)204ff94bc40SHeiko Schocher static int validate_inode(struct ubifs_info *c, const struct inode *inode)
205ff94bc40SHeiko Schocher {
206ff94bc40SHeiko Schocher int err;
207ff94bc40SHeiko Schocher const struct ubifs_inode *ui = ubifs_inode(inode);
208ff94bc40SHeiko Schocher
209ff94bc40SHeiko Schocher if (inode->i_size > c->max_inode_sz) {
2100195a7bbSHeiko Schocher ubifs_err(c, "inode is too large (%lld)",
211ff94bc40SHeiko Schocher (long long)inode->i_size);
212ff94bc40SHeiko Schocher return 1;
213ff94bc40SHeiko Schocher }
214ff94bc40SHeiko Schocher
2150195a7bbSHeiko Schocher if (ui->compr_type >= UBIFS_COMPR_TYPES_CNT) {
2160195a7bbSHeiko Schocher ubifs_err(c, "unknown compression type %d", ui->compr_type);
217ff94bc40SHeiko Schocher return 2;
218ff94bc40SHeiko Schocher }
219ff94bc40SHeiko Schocher
220ff94bc40SHeiko Schocher if (ui->xattr_names + ui->xattr_cnt > XATTR_LIST_MAX)
221ff94bc40SHeiko Schocher return 3;
222ff94bc40SHeiko Schocher
223ff94bc40SHeiko Schocher if (ui->data_len < 0 || ui->data_len > UBIFS_MAX_INO_DATA)
224ff94bc40SHeiko Schocher return 4;
225ff94bc40SHeiko Schocher
226ff94bc40SHeiko Schocher if (ui->xattr && !S_ISREG(inode->i_mode))
227ff94bc40SHeiko Schocher return 5;
228ff94bc40SHeiko Schocher
229ff94bc40SHeiko Schocher if (!ubifs_compr_present(ui->compr_type)) {
2300195a7bbSHeiko Schocher ubifs_warn(c, "inode %lu uses '%s' compression, but it was not compiled in",
231ff94bc40SHeiko Schocher inode->i_ino, ubifs_compr_name(ui->compr_type));
232ff94bc40SHeiko Schocher }
233ff94bc40SHeiko Schocher
234ff94bc40SHeiko Schocher err = dbg_check_dir(c, inode);
235ff94bc40SHeiko Schocher return err;
236ff94bc40SHeiko Schocher }
237ff94bc40SHeiko Schocher
ubifs_iget(struct super_block * sb,unsigned long inum)2389eefe2a2SStefan Roese struct inode *ubifs_iget(struct super_block *sb, unsigned long inum)
2399eefe2a2SStefan Roese {
2409eefe2a2SStefan Roese int err;
2419eefe2a2SStefan Roese union ubifs_key key;
2429eefe2a2SStefan Roese struct ubifs_ino_node *ino;
2439eefe2a2SStefan Roese struct ubifs_info *c = sb->s_fs_info;
2449eefe2a2SStefan Roese struct inode *inode;
2459eefe2a2SStefan Roese struct ubifs_inode *ui;
246ff94bc40SHeiko Schocher #ifdef __UBOOT__
2479eefe2a2SStefan Roese int i;
248ff94bc40SHeiko Schocher #endif
2499eefe2a2SStefan Roese
2509eefe2a2SStefan Roese dbg_gen("inode %lu", inum);
2519eefe2a2SStefan Roese
252ff94bc40SHeiko Schocher #ifdef __UBOOT__
2539eefe2a2SStefan Roese /*
2549eefe2a2SStefan Roese * U-Boot special handling of locked down inodes via recovery
2559eefe2a2SStefan Roese * e.g. ubifs_recover_size()
2569eefe2a2SStefan Roese */
2579eefe2a2SStefan Roese for (i = 0; i < INODE_LOCKED_MAX; i++) {
2589eefe2a2SStefan Roese /*
2599eefe2a2SStefan Roese * Exit on last entry (NULL), inode not found in list
2609eefe2a2SStefan Roese */
2619eefe2a2SStefan Roese if (inodes_locked_down[i] == NULL)
2629eefe2a2SStefan Roese break;
2639eefe2a2SStefan Roese
2649eefe2a2SStefan Roese if (inodes_locked_down[i]->i_ino == inum) {
2659eefe2a2SStefan Roese /*
2669eefe2a2SStefan Roese * We found the locked down inode in our array,
2679eefe2a2SStefan Roese * so just return this pointer instead of creating
2689eefe2a2SStefan Roese * a new one.
2699eefe2a2SStefan Roese */
2709eefe2a2SStefan Roese return inodes_locked_down[i];
2719eefe2a2SStefan Roese }
2729eefe2a2SStefan Roese }
273ff94bc40SHeiko Schocher #endif
2749eefe2a2SStefan Roese
2759eefe2a2SStefan Roese inode = iget_locked(sb, inum);
2769eefe2a2SStefan Roese if (!inode)
2779eefe2a2SStefan Roese return ERR_PTR(-ENOMEM);
2789eefe2a2SStefan Roese if (!(inode->i_state & I_NEW))
2799eefe2a2SStefan Roese return inode;
2809eefe2a2SStefan Roese ui = ubifs_inode(inode);
2819eefe2a2SStefan Roese
2829eefe2a2SStefan Roese ino = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS);
2839eefe2a2SStefan Roese if (!ino) {
2849eefe2a2SStefan Roese err = -ENOMEM;
2859eefe2a2SStefan Roese goto out;
2869eefe2a2SStefan Roese }
2879eefe2a2SStefan Roese
2889eefe2a2SStefan Roese ino_key_init(c, &key, inode->i_ino);
2899eefe2a2SStefan Roese
2909eefe2a2SStefan Roese err = ubifs_tnc_lookup(c, &key, ino);
2919eefe2a2SStefan Roese if (err)
2929eefe2a2SStefan Roese goto out_ino;
2939eefe2a2SStefan Roese
2949eefe2a2SStefan Roese inode->i_flags |= (S_NOCMTIME | S_NOATIME);
295ff94bc40SHeiko Schocher set_nlink(inode, le32_to_cpu(ino->nlink));
296ff94bc40SHeiko Schocher i_uid_write(inode, le32_to_cpu(ino->uid));
297ff94bc40SHeiko Schocher i_gid_write(inode, le32_to_cpu(ino->gid));
2989eefe2a2SStefan Roese inode->i_atime.tv_sec = (int64_t)le64_to_cpu(ino->atime_sec);
2999eefe2a2SStefan Roese inode->i_atime.tv_nsec = le32_to_cpu(ino->atime_nsec);
3009eefe2a2SStefan Roese inode->i_mtime.tv_sec = (int64_t)le64_to_cpu(ino->mtime_sec);
3019eefe2a2SStefan Roese inode->i_mtime.tv_nsec = le32_to_cpu(ino->mtime_nsec);
3029eefe2a2SStefan Roese inode->i_ctime.tv_sec = (int64_t)le64_to_cpu(ino->ctime_sec);
3039eefe2a2SStefan Roese inode->i_ctime.tv_nsec = le32_to_cpu(ino->ctime_nsec);
3049eefe2a2SStefan Roese inode->i_mode = le32_to_cpu(ino->mode);
3059eefe2a2SStefan Roese inode->i_size = le64_to_cpu(ino->size);
3069eefe2a2SStefan Roese
3079eefe2a2SStefan Roese ui->data_len = le32_to_cpu(ino->data_len);
3089eefe2a2SStefan Roese ui->flags = le32_to_cpu(ino->flags);
3099eefe2a2SStefan Roese ui->compr_type = le16_to_cpu(ino->compr_type);
3109eefe2a2SStefan Roese ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum);
311ff94bc40SHeiko Schocher ui->xattr_cnt = le32_to_cpu(ino->xattr_cnt);
312ff94bc40SHeiko Schocher ui->xattr_size = le32_to_cpu(ino->xattr_size);
313ff94bc40SHeiko Schocher ui->xattr_names = le32_to_cpu(ino->xattr_names);
3149eefe2a2SStefan Roese ui->synced_i_size = ui->ui_size = inode->i_size;
3159eefe2a2SStefan Roese
316ff94bc40SHeiko Schocher ui->xattr = (ui->flags & UBIFS_XATTR_FL) ? 1 : 0;
317ff94bc40SHeiko Schocher
3189eefe2a2SStefan Roese err = validate_inode(c, inode);
3199eefe2a2SStefan Roese if (err)
3209eefe2a2SStefan Roese goto out_invalid;
3219eefe2a2SStefan Roese
322ff94bc40SHeiko Schocher #ifndef __UBOOT__
323ff94bc40SHeiko Schocher switch (inode->i_mode & S_IFMT) {
324ff94bc40SHeiko Schocher case S_IFREG:
325ff94bc40SHeiko Schocher inode->i_mapping->a_ops = &ubifs_file_address_operations;
326ff94bc40SHeiko Schocher inode->i_op = &ubifs_file_inode_operations;
327ff94bc40SHeiko Schocher inode->i_fop = &ubifs_file_operations;
328ff94bc40SHeiko Schocher if (ui->xattr) {
329ff94bc40SHeiko Schocher ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
330ff94bc40SHeiko Schocher if (!ui->data) {
331ff94bc40SHeiko Schocher err = -ENOMEM;
332ff94bc40SHeiko Schocher goto out_ino;
333ff94bc40SHeiko Schocher }
334ff94bc40SHeiko Schocher memcpy(ui->data, ino->data, ui->data_len);
335ff94bc40SHeiko Schocher ((char *)ui->data)[ui->data_len] = '\0';
336ff94bc40SHeiko Schocher } else if (ui->data_len != 0) {
337ff94bc40SHeiko Schocher err = 10;
338ff94bc40SHeiko Schocher goto out_invalid;
339ff94bc40SHeiko Schocher }
340ff94bc40SHeiko Schocher break;
341ff94bc40SHeiko Schocher case S_IFDIR:
342ff94bc40SHeiko Schocher inode->i_op = &ubifs_dir_inode_operations;
343ff94bc40SHeiko Schocher inode->i_fop = &ubifs_dir_operations;
344ff94bc40SHeiko Schocher if (ui->data_len != 0) {
345ff94bc40SHeiko Schocher err = 11;
346ff94bc40SHeiko Schocher goto out_invalid;
347ff94bc40SHeiko Schocher }
348ff94bc40SHeiko Schocher break;
349ff94bc40SHeiko Schocher case S_IFLNK:
350ff94bc40SHeiko Schocher inode->i_op = &ubifs_symlink_inode_operations;
351ff94bc40SHeiko Schocher if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) {
352ff94bc40SHeiko Schocher err = 12;
353ff94bc40SHeiko Schocher goto out_invalid;
354ff94bc40SHeiko Schocher }
355ff94bc40SHeiko Schocher ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
356ff94bc40SHeiko Schocher if (!ui->data) {
357ff94bc40SHeiko Schocher err = -ENOMEM;
358ff94bc40SHeiko Schocher goto out_ino;
359ff94bc40SHeiko Schocher }
360ff94bc40SHeiko Schocher memcpy(ui->data, ino->data, ui->data_len);
361ff94bc40SHeiko Schocher ((char *)ui->data)[ui->data_len] = '\0';
3620195a7bbSHeiko Schocher inode->i_link = ui->data;
363ff94bc40SHeiko Schocher break;
364ff94bc40SHeiko Schocher case S_IFBLK:
365ff94bc40SHeiko Schocher case S_IFCHR:
366ff94bc40SHeiko Schocher {
367ff94bc40SHeiko Schocher dev_t rdev;
368ff94bc40SHeiko Schocher union ubifs_dev_desc *dev;
369ff94bc40SHeiko Schocher
370ff94bc40SHeiko Schocher ui->data = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
371ff94bc40SHeiko Schocher if (!ui->data) {
372ff94bc40SHeiko Schocher err = -ENOMEM;
373ff94bc40SHeiko Schocher goto out_ino;
374ff94bc40SHeiko Schocher }
375ff94bc40SHeiko Schocher
376ff94bc40SHeiko Schocher dev = (union ubifs_dev_desc *)ino->data;
377ff94bc40SHeiko Schocher if (ui->data_len == sizeof(dev->new))
378ff94bc40SHeiko Schocher rdev = new_decode_dev(le32_to_cpu(dev->new));
379ff94bc40SHeiko Schocher else if (ui->data_len == sizeof(dev->huge))
380ff94bc40SHeiko Schocher rdev = huge_decode_dev(le64_to_cpu(dev->huge));
381ff94bc40SHeiko Schocher else {
382ff94bc40SHeiko Schocher err = 13;
383ff94bc40SHeiko Schocher goto out_invalid;
384ff94bc40SHeiko Schocher }
385ff94bc40SHeiko Schocher memcpy(ui->data, ino->data, ui->data_len);
386ff94bc40SHeiko Schocher inode->i_op = &ubifs_file_inode_operations;
387ff94bc40SHeiko Schocher init_special_inode(inode, inode->i_mode, rdev);
388ff94bc40SHeiko Schocher break;
389ff94bc40SHeiko Schocher }
390ff94bc40SHeiko Schocher case S_IFSOCK:
391ff94bc40SHeiko Schocher case S_IFIFO:
392ff94bc40SHeiko Schocher inode->i_op = &ubifs_file_inode_operations;
393ff94bc40SHeiko Schocher init_special_inode(inode, inode->i_mode, 0);
394ff94bc40SHeiko Schocher if (ui->data_len != 0) {
395ff94bc40SHeiko Schocher err = 14;
396ff94bc40SHeiko Schocher goto out_invalid;
397ff94bc40SHeiko Schocher }
398ff94bc40SHeiko Schocher break;
399ff94bc40SHeiko Schocher default:
400ff94bc40SHeiko Schocher err = 15;
401ff94bc40SHeiko Schocher goto out_invalid;
402ff94bc40SHeiko Schocher }
403ff94bc40SHeiko Schocher #else
4049eefe2a2SStefan Roese if ((inode->i_mode & S_IFMT) == S_IFLNK) {
4059eefe2a2SStefan Roese if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) {
4069eefe2a2SStefan Roese err = 12;
4079eefe2a2SStefan Roese goto out_invalid;
4089eefe2a2SStefan Roese }
4099eefe2a2SStefan Roese ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
4109eefe2a2SStefan Roese if (!ui->data) {
4119eefe2a2SStefan Roese err = -ENOMEM;
4129eefe2a2SStefan Roese goto out_ino;
4139eefe2a2SStefan Roese }
4149eefe2a2SStefan Roese memcpy(ui->data, ino->data, ui->data_len);
4159eefe2a2SStefan Roese ((char *)ui->data)[ui->data_len] = '\0';
4169eefe2a2SStefan Roese }
417ff94bc40SHeiko Schocher #endif
4189eefe2a2SStefan Roese
4199eefe2a2SStefan Roese kfree(ino);
420ff94bc40SHeiko Schocher #ifndef __UBOOT__
421ff94bc40SHeiko Schocher ubifs_set_inode_flags(inode);
422ff94bc40SHeiko Schocher #endif
423ff94bc40SHeiko Schocher unlock_new_inode(inode);
4249eefe2a2SStefan Roese return inode;
4259eefe2a2SStefan Roese
4269eefe2a2SStefan Roese out_invalid:
4270195a7bbSHeiko Schocher ubifs_err(c, "inode %lu validation failed, error %d", inode->i_ino, err);
428ff94bc40SHeiko Schocher ubifs_dump_node(c, ino);
429ff94bc40SHeiko Schocher ubifs_dump_inode(c, inode);
4309eefe2a2SStefan Roese err = -EINVAL;
4319eefe2a2SStefan Roese out_ino:
4329eefe2a2SStefan Roese kfree(ino);
4339eefe2a2SStefan Roese out:
4340195a7bbSHeiko Schocher ubifs_err(c, "failed to read inode %lu, error %d", inode->i_ino, err);
435ff94bc40SHeiko Schocher iget_failed(inode);
4369eefe2a2SStefan Roese return ERR_PTR(err);
4379eefe2a2SStefan Roese }
4389eefe2a2SStefan Roese
ubifs_alloc_inode(struct super_block * sb)439ff94bc40SHeiko Schocher static struct inode *ubifs_alloc_inode(struct super_block *sb)
440ff94bc40SHeiko Schocher {
441ff94bc40SHeiko Schocher struct ubifs_inode *ui;
442ff94bc40SHeiko Schocher
443ff94bc40SHeiko Schocher ui = kmem_cache_alloc(ubifs_inode_slab, GFP_NOFS);
444ff94bc40SHeiko Schocher if (!ui)
445ff94bc40SHeiko Schocher return NULL;
446ff94bc40SHeiko Schocher
447ff94bc40SHeiko Schocher memset((void *)ui + sizeof(struct inode), 0,
448ff94bc40SHeiko Schocher sizeof(struct ubifs_inode) - sizeof(struct inode));
449ff94bc40SHeiko Schocher mutex_init(&ui->ui_mutex);
450ff94bc40SHeiko Schocher spin_lock_init(&ui->ui_lock);
451ff94bc40SHeiko Schocher return &ui->vfs_inode;
452ff94bc40SHeiko Schocher };
453ff94bc40SHeiko Schocher
454ff94bc40SHeiko Schocher #ifndef __UBOOT__
ubifs_i_callback(struct rcu_head * head)455ff94bc40SHeiko Schocher static void ubifs_i_callback(struct rcu_head *head)
456ff94bc40SHeiko Schocher {
457ff94bc40SHeiko Schocher struct inode *inode = container_of(head, struct inode, i_rcu);
458ff94bc40SHeiko Schocher struct ubifs_inode *ui = ubifs_inode(inode);
459ff94bc40SHeiko Schocher kmem_cache_free(ubifs_inode_slab, ui);
460ff94bc40SHeiko Schocher }
461ff94bc40SHeiko Schocher
ubifs_destroy_inode(struct inode * inode)462ff94bc40SHeiko Schocher static void ubifs_destroy_inode(struct inode *inode)
463ff94bc40SHeiko Schocher {
464ff94bc40SHeiko Schocher struct ubifs_inode *ui = ubifs_inode(inode);
465ff94bc40SHeiko Schocher
466ff94bc40SHeiko Schocher kfree(ui->data);
467ff94bc40SHeiko Schocher call_rcu(&inode->i_rcu, ubifs_i_callback);
468ff94bc40SHeiko Schocher }
469ff94bc40SHeiko Schocher
470ff94bc40SHeiko Schocher /*
471ff94bc40SHeiko Schocher * Note, Linux write-back code calls this without 'i_mutex'.
472ff94bc40SHeiko Schocher */
ubifs_write_inode(struct inode * inode,struct writeback_control * wbc)473ff94bc40SHeiko Schocher static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc)
474ff94bc40SHeiko Schocher {
475ff94bc40SHeiko Schocher int err = 0;
476ff94bc40SHeiko Schocher struct ubifs_info *c = inode->i_sb->s_fs_info;
477ff94bc40SHeiko Schocher struct ubifs_inode *ui = ubifs_inode(inode);
478ff94bc40SHeiko Schocher
479ff94bc40SHeiko Schocher ubifs_assert(!ui->xattr);
480ff94bc40SHeiko Schocher if (is_bad_inode(inode))
481ff94bc40SHeiko Schocher return 0;
482ff94bc40SHeiko Schocher
483ff94bc40SHeiko Schocher mutex_lock(&ui->ui_mutex);
484ff94bc40SHeiko Schocher /*
485ff94bc40SHeiko Schocher * Due to races between write-back forced by budgeting
486ff94bc40SHeiko Schocher * (see 'sync_some_inodes()') and background write-back, the inode may
487ff94bc40SHeiko Schocher * have already been synchronized, do not do this again. This might
488ff94bc40SHeiko Schocher * also happen if it was synchronized in an VFS operation, e.g.
489ff94bc40SHeiko Schocher * 'ubifs_link()'.
490ff94bc40SHeiko Schocher */
491ff94bc40SHeiko Schocher if (!ui->dirty) {
492ff94bc40SHeiko Schocher mutex_unlock(&ui->ui_mutex);
493ff94bc40SHeiko Schocher return 0;
494ff94bc40SHeiko Schocher }
495ff94bc40SHeiko Schocher
496ff94bc40SHeiko Schocher /*
497ff94bc40SHeiko Schocher * As an optimization, do not write orphan inodes to the media just
498ff94bc40SHeiko Schocher * because this is not needed.
499ff94bc40SHeiko Schocher */
500ff94bc40SHeiko Schocher dbg_gen("inode %lu, mode %#x, nlink %u",
501ff94bc40SHeiko Schocher inode->i_ino, (int)inode->i_mode, inode->i_nlink);
502ff94bc40SHeiko Schocher if (inode->i_nlink) {
503ff94bc40SHeiko Schocher err = ubifs_jnl_write_inode(c, inode);
504ff94bc40SHeiko Schocher if (err)
5050195a7bbSHeiko Schocher ubifs_err(c, "can't write inode %lu, error %d",
506ff94bc40SHeiko Schocher inode->i_ino, err);
507ff94bc40SHeiko Schocher else
508ff94bc40SHeiko Schocher err = dbg_check_inode_size(c, inode, ui->ui_size);
509ff94bc40SHeiko Schocher }
510ff94bc40SHeiko Schocher
511ff94bc40SHeiko Schocher ui->dirty = 0;
512ff94bc40SHeiko Schocher mutex_unlock(&ui->ui_mutex);
513ff94bc40SHeiko Schocher ubifs_release_dirty_inode_budget(c, ui);
514ff94bc40SHeiko Schocher return err;
515ff94bc40SHeiko Schocher }
516ff94bc40SHeiko Schocher
ubifs_evict_inode(struct inode * inode)517ff94bc40SHeiko Schocher static void ubifs_evict_inode(struct inode *inode)
518ff94bc40SHeiko Schocher {
519ff94bc40SHeiko Schocher int err;
520ff94bc40SHeiko Schocher struct ubifs_info *c = inode->i_sb->s_fs_info;
521ff94bc40SHeiko Schocher struct ubifs_inode *ui = ubifs_inode(inode);
522ff94bc40SHeiko Schocher
523ff94bc40SHeiko Schocher if (ui->xattr)
524ff94bc40SHeiko Schocher /*
525ff94bc40SHeiko Schocher * Extended attribute inode deletions are fully handled in
526ff94bc40SHeiko Schocher * 'ubifs_removexattr()'. These inodes are special and have
527ff94bc40SHeiko Schocher * limited usage, so there is nothing to do here.
528ff94bc40SHeiko Schocher */
529ff94bc40SHeiko Schocher goto out;
530ff94bc40SHeiko Schocher
531ff94bc40SHeiko Schocher dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode);
532ff94bc40SHeiko Schocher ubifs_assert(!atomic_read(&inode->i_count));
533ff94bc40SHeiko Schocher
5344e67c571SHeiko Schocher truncate_inode_pages_final(&inode->i_data);
535ff94bc40SHeiko Schocher
536ff94bc40SHeiko Schocher if (inode->i_nlink)
537ff94bc40SHeiko Schocher goto done;
538ff94bc40SHeiko Schocher
539ff94bc40SHeiko Schocher if (is_bad_inode(inode))
540ff94bc40SHeiko Schocher goto out;
541ff94bc40SHeiko Schocher
542ff94bc40SHeiko Schocher ui->ui_size = inode->i_size = 0;
543ff94bc40SHeiko Schocher err = ubifs_jnl_delete_inode(c, inode);
544ff94bc40SHeiko Schocher if (err)
545ff94bc40SHeiko Schocher /*
546ff94bc40SHeiko Schocher * Worst case we have a lost orphan inode wasting space, so a
547ff94bc40SHeiko Schocher * simple error message is OK here.
548ff94bc40SHeiko Schocher */
5490195a7bbSHeiko Schocher ubifs_err(c, "can't delete inode %lu, error %d",
550ff94bc40SHeiko Schocher inode->i_ino, err);
551ff94bc40SHeiko Schocher
552ff94bc40SHeiko Schocher out:
553ff94bc40SHeiko Schocher if (ui->dirty)
554ff94bc40SHeiko Schocher ubifs_release_dirty_inode_budget(c, ui);
555ff94bc40SHeiko Schocher else {
556ff94bc40SHeiko Schocher /* We've deleted something - clean the "no space" flags */
557ff94bc40SHeiko Schocher c->bi.nospace = c->bi.nospace_rp = 0;
558ff94bc40SHeiko Schocher smp_wmb();
559ff94bc40SHeiko Schocher }
560ff94bc40SHeiko Schocher done:
561ff94bc40SHeiko Schocher clear_inode(inode);
562ff94bc40SHeiko Schocher }
563ff94bc40SHeiko Schocher #endif
564ff94bc40SHeiko Schocher
ubifs_dirty_inode(struct inode * inode,int flags)565ff94bc40SHeiko Schocher static void ubifs_dirty_inode(struct inode *inode, int flags)
566ff94bc40SHeiko Schocher {
567ff94bc40SHeiko Schocher struct ubifs_inode *ui = ubifs_inode(inode);
568ff94bc40SHeiko Schocher
569ff94bc40SHeiko Schocher ubifs_assert(mutex_is_locked(&ui->ui_mutex));
570ff94bc40SHeiko Schocher if (!ui->dirty) {
571ff94bc40SHeiko Schocher ui->dirty = 1;
572ff94bc40SHeiko Schocher dbg_gen("inode %lu", inode->i_ino);
573ff94bc40SHeiko Schocher }
574ff94bc40SHeiko Schocher }
575ff94bc40SHeiko Schocher
576ff94bc40SHeiko Schocher #ifndef __UBOOT__
ubifs_statfs(struct dentry * dentry,struct kstatfs * buf)577ff94bc40SHeiko Schocher static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf)
578ff94bc40SHeiko Schocher {
579ff94bc40SHeiko Schocher struct ubifs_info *c = dentry->d_sb->s_fs_info;
580ff94bc40SHeiko Schocher unsigned long long free;
581ff94bc40SHeiko Schocher __le32 *uuid = (__le32 *)c->uuid;
582ff94bc40SHeiko Schocher
583ff94bc40SHeiko Schocher free = ubifs_get_free_space(c);
584ff94bc40SHeiko Schocher dbg_gen("free space %lld bytes (%lld blocks)",
585ff94bc40SHeiko Schocher free, free >> UBIFS_BLOCK_SHIFT);
586ff94bc40SHeiko Schocher
587ff94bc40SHeiko Schocher buf->f_type = UBIFS_SUPER_MAGIC;
588ff94bc40SHeiko Schocher buf->f_bsize = UBIFS_BLOCK_SIZE;
589ff94bc40SHeiko Schocher buf->f_blocks = c->block_cnt;
590ff94bc40SHeiko Schocher buf->f_bfree = free >> UBIFS_BLOCK_SHIFT;
591ff94bc40SHeiko Schocher if (free > c->report_rp_size)
592ff94bc40SHeiko Schocher buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT;
593ff94bc40SHeiko Schocher else
594ff94bc40SHeiko Schocher buf->f_bavail = 0;
595ff94bc40SHeiko Schocher buf->f_files = 0;
596ff94bc40SHeiko Schocher buf->f_ffree = 0;
597ff94bc40SHeiko Schocher buf->f_namelen = UBIFS_MAX_NLEN;
598ff94bc40SHeiko Schocher buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]);
599ff94bc40SHeiko Schocher buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]);
600ff94bc40SHeiko Schocher ubifs_assert(buf->f_bfree <= c->block_cnt);
601ff94bc40SHeiko Schocher return 0;
602ff94bc40SHeiko Schocher }
603ff94bc40SHeiko Schocher
ubifs_show_options(struct seq_file * s,struct dentry * root)604ff94bc40SHeiko Schocher static int ubifs_show_options(struct seq_file *s, struct dentry *root)
605ff94bc40SHeiko Schocher {
606ff94bc40SHeiko Schocher struct ubifs_info *c = root->d_sb->s_fs_info;
607ff94bc40SHeiko Schocher
608ff94bc40SHeiko Schocher if (c->mount_opts.unmount_mode == 2)
6090195a7bbSHeiko Schocher seq_puts(s, ",fast_unmount");
610ff94bc40SHeiko Schocher else if (c->mount_opts.unmount_mode == 1)
6110195a7bbSHeiko Schocher seq_puts(s, ",norm_unmount");
612ff94bc40SHeiko Schocher
613ff94bc40SHeiko Schocher if (c->mount_opts.bulk_read == 2)
6140195a7bbSHeiko Schocher seq_puts(s, ",bulk_read");
615ff94bc40SHeiko Schocher else if (c->mount_opts.bulk_read == 1)
6160195a7bbSHeiko Schocher seq_puts(s, ",no_bulk_read");
617ff94bc40SHeiko Schocher
618ff94bc40SHeiko Schocher if (c->mount_opts.chk_data_crc == 2)
6190195a7bbSHeiko Schocher seq_puts(s, ",chk_data_crc");
620ff94bc40SHeiko Schocher else if (c->mount_opts.chk_data_crc == 1)
6210195a7bbSHeiko Schocher seq_puts(s, ",no_chk_data_crc");
622ff94bc40SHeiko Schocher
623ff94bc40SHeiko Schocher if (c->mount_opts.override_compr) {
624ff94bc40SHeiko Schocher seq_printf(s, ",compr=%s",
625ff94bc40SHeiko Schocher ubifs_compr_name(c->mount_opts.compr_type));
626ff94bc40SHeiko Schocher }
627ff94bc40SHeiko Schocher
628ff94bc40SHeiko Schocher return 0;
629ff94bc40SHeiko Schocher }
630ff94bc40SHeiko Schocher
ubifs_sync_fs(struct super_block * sb,int wait)631ff94bc40SHeiko Schocher static int ubifs_sync_fs(struct super_block *sb, int wait)
632ff94bc40SHeiko Schocher {
633ff94bc40SHeiko Schocher int i, err;
634ff94bc40SHeiko Schocher struct ubifs_info *c = sb->s_fs_info;
635ff94bc40SHeiko Schocher
636ff94bc40SHeiko Schocher /*
637ff94bc40SHeiko Schocher * Zero @wait is just an advisory thing to help the file system shove
638ff94bc40SHeiko Schocher * lots of data into the queues, and there will be the second
639ff94bc40SHeiko Schocher * '->sync_fs()' call, with non-zero @wait.
640ff94bc40SHeiko Schocher */
641ff94bc40SHeiko Schocher if (!wait)
642ff94bc40SHeiko Schocher return 0;
643ff94bc40SHeiko Schocher
644ff94bc40SHeiko Schocher /*
645ff94bc40SHeiko Schocher * Synchronize write buffers, because 'ubifs_run_commit()' does not
646ff94bc40SHeiko Schocher * do this if it waits for an already running commit.
647ff94bc40SHeiko Schocher */
648ff94bc40SHeiko Schocher for (i = 0; i < c->jhead_cnt; i++) {
649ff94bc40SHeiko Schocher err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
650ff94bc40SHeiko Schocher if (err)
651ff94bc40SHeiko Schocher return err;
652ff94bc40SHeiko Schocher }
653ff94bc40SHeiko Schocher
654ff94bc40SHeiko Schocher /*
655ff94bc40SHeiko Schocher * Strictly speaking, it is not necessary to commit the journal here,
656ff94bc40SHeiko Schocher * synchronizing write-buffers would be enough. But committing makes
657ff94bc40SHeiko Schocher * UBIFS free space predictions much more accurate, so we want to let
658ff94bc40SHeiko Schocher * the user be able to get more accurate results of 'statfs()' after
659ff94bc40SHeiko Schocher * they synchronize the file system.
660ff94bc40SHeiko Schocher */
661ff94bc40SHeiko Schocher err = ubifs_run_commit(c);
662ff94bc40SHeiko Schocher if (err)
663ff94bc40SHeiko Schocher return err;
664ff94bc40SHeiko Schocher
665ff94bc40SHeiko Schocher return ubi_sync(c->vi.ubi_num);
666ff94bc40SHeiko Schocher }
667ff94bc40SHeiko Schocher #endif
668ff94bc40SHeiko Schocher
6699eefe2a2SStefan Roese /**
6709eefe2a2SStefan Roese * init_constants_early - initialize UBIFS constants.
6719eefe2a2SStefan Roese * @c: UBIFS file-system description object
6729eefe2a2SStefan Roese *
6739eefe2a2SStefan Roese * This function initialize UBIFS constants which do not need the superblock to
6749eefe2a2SStefan Roese * be read. It also checks that the UBI volume satisfies basic UBIFS
6759eefe2a2SStefan Roese * requirements. Returns zero in case of success and a negative error code in
6769eefe2a2SStefan Roese * case of failure.
6779eefe2a2SStefan Roese */
init_constants_early(struct ubifs_info * c)6789eefe2a2SStefan Roese static int init_constants_early(struct ubifs_info *c)
6799eefe2a2SStefan Roese {
6809eefe2a2SStefan Roese if (c->vi.corrupted) {
6810195a7bbSHeiko Schocher ubifs_warn(c, "UBI volume is corrupted - read-only mode");
6829eefe2a2SStefan Roese c->ro_media = 1;
6839eefe2a2SStefan Roese }
6849eefe2a2SStefan Roese
6859eefe2a2SStefan Roese if (c->di.ro_mode) {
6860195a7bbSHeiko Schocher ubifs_msg(c, "read-only UBI device");
6879eefe2a2SStefan Roese c->ro_media = 1;
6889eefe2a2SStefan Roese }
6899eefe2a2SStefan Roese
6909eefe2a2SStefan Roese if (c->vi.vol_type == UBI_STATIC_VOLUME) {
6910195a7bbSHeiko Schocher ubifs_msg(c, "static UBI volume - read-only mode");
6929eefe2a2SStefan Roese c->ro_media = 1;
6939eefe2a2SStefan Roese }
6949eefe2a2SStefan Roese
6959eefe2a2SStefan Roese c->leb_cnt = c->vi.size;
6969eefe2a2SStefan Roese c->leb_size = c->vi.usable_leb_size;
697ff94bc40SHeiko Schocher c->leb_start = c->di.leb_start;
6989eefe2a2SStefan Roese c->half_leb_size = c->leb_size / 2;
6999eefe2a2SStefan Roese c->min_io_size = c->di.min_io_size;
7009eefe2a2SStefan Roese c->min_io_shift = fls(c->min_io_size) - 1;
701ff94bc40SHeiko Schocher c->max_write_size = c->di.max_write_size;
702ff94bc40SHeiko Schocher c->max_write_shift = fls(c->max_write_size) - 1;
7039eefe2a2SStefan Roese
7049eefe2a2SStefan Roese if (c->leb_size < UBIFS_MIN_LEB_SZ) {
7050195a7bbSHeiko Schocher ubifs_err(c, "too small LEBs (%d bytes), min. is %d bytes",
7069eefe2a2SStefan Roese c->leb_size, UBIFS_MIN_LEB_SZ);
7079eefe2a2SStefan Roese return -EINVAL;
7089eefe2a2SStefan Roese }
7099eefe2a2SStefan Roese
7109eefe2a2SStefan Roese if (c->leb_cnt < UBIFS_MIN_LEB_CNT) {
7110195a7bbSHeiko Schocher ubifs_err(c, "too few LEBs (%d), min. is %d",
7129eefe2a2SStefan Roese c->leb_cnt, UBIFS_MIN_LEB_CNT);
7139eefe2a2SStefan Roese return -EINVAL;
7149eefe2a2SStefan Roese }
7159eefe2a2SStefan Roese
7169eefe2a2SStefan Roese if (!is_power_of_2(c->min_io_size)) {
7170195a7bbSHeiko Schocher ubifs_err(c, "bad min. I/O size %d", c->min_io_size);
7189eefe2a2SStefan Roese return -EINVAL;
7199eefe2a2SStefan Roese }
7209eefe2a2SStefan Roese
7219eefe2a2SStefan Roese /*
722ff94bc40SHeiko Schocher * Maximum write size has to be greater or equivalent to min. I/O
723ff94bc40SHeiko Schocher * size, and be multiple of min. I/O size.
724ff94bc40SHeiko Schocher */
725ff94bc40SHeiko Schocher if (c->max_write_size < c->min_io_size ||
726ff94bc40SHeiko Schocher c->max_write_size % c->min_io_size ||
727ff94bc40SHeiko Schocher !is_power_of_2(c->max_write_size)) {
7280195a7bbSHeiko Schocher ubifs_err(c, "bad write buffer size %d for %d min. I/O unit",
729ff94bc40SHeiko Schocher c->max_write_size, c->min_io_size);
730ff94bc40SHeiko Schocher return -EINVAL;
731ff94bc40SHeiko Schocher }
732ff94bc40SHeiko Schocher
733ff94bc40SHeiko Schocher /*
7349eefe2a2SStefan Roese * UBIFS aligns all node to 8-byte boundary, so to make function in
7359eefe2a2SStefan Roese * io.c simpler, assume minimum I/O unit size to be 8 bytes if it is
7369eefe2a2SStefan Roese * less than 8.
7379eefe2a2SStefan Roese */
7389eefe2a2SStefan Roese if (c->min_io_size < 8) {
7399eefe2a2SStefan Roese c->min_io_size = 8;
7409eefe2a2SStefan Roese c->min_io_shift = 3;
741ff94bc40SHeiko Schocher if (c->max_write_size < c->min_io_size) {
742ff94bc40SHeiko Schocher c->max_write_size = c->min_io_size;
743ff94bc40SHeiko Schocher c->max_write_shift = c->min_io_shift;
744ff94bc40SHeiko Schocher }
7459eefe2a2SStefan Roese }
7469eefe2a2SStefan Roese
7479eefe2a2SStefan Roese c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size);
7489eefe2a2SStefan Roese c->mst_node_alsz = ALIGN(UBIFS_MST_NODE_SZ, c->min_io_size);
7499eefe2a2SStefan Roese
7509eefe2a2SStefan Roese /*
7519eefe2a2SStefan Roese * Initialize node length ranges which are mostly needed for node
7529eefe2a2SStefan Roese * length validation.
7539eefe2a2SStefan Roese */
7549eefe2a2SStefan Roese c->ranges[UBIFS_PAD_NODE].len = UBIFS_PAD_NODE_SZ;
7559eefe2a2SStefan Roese c->ranges[UBIFS_SB_NODE].len = UBIFS_SB_NODE_SZ;
7569eefe2a2SStefan Roese c->ranges[UBIFS_MST_NODE].len = UBIFS_MST_NODE_SZ;
7579eefe2a2SStefan Roese c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ;
7589eefe2a2SStefan Roese c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ;
7599eefe2a2SStefan Roese c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ;
7609eefe2a2SStefan Roese
7619eefe2a2SStefan Roese c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ;
7629eefe2a2SStefan Roese c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ;
7639eefe2a2SStefan Roese c->ranges[UBIFS_ORPH_NODE].min_len =
7649eefe2a2SStefan Roese UBIFS_ORPH_NODE_SZ + sizeof(__le64);
7659eefe2a2SStefan Roese c->ranges[UBIFS_ORPH_NODE].max_len = c->leb_size;
7669eefe2a2SStefan Roese c->ranges[UBIFS_DENT_NODE].min_len = UBIFS_DENT_NODE_SZ;
7679eefe2a2SStefan Roese c->ranges[UBIFS_DENT_NODE].max_len = UBIFS_MAX_DENT_NODE_SZ;
7689eefe2a2SStefan Roese c->ranges[UBIFS_XENT_NODE].min_len = UBIFS_XENT_NODE_SZ;
7699eefe2a2SStefan Roese c->ranges[UBIFS_XENT_NODE].max_len = UBIFS_MAX_XENT_NODE_SZ;
7709eefe2a2SStefan Roese c->ranges[UBIFS_DATA_NODE].min_len = UBIFS_DATA_NODE_SZ;
7719eefe2a2SStefan Roese c->ranges[UBIFS_DATA_NODE].max_len = UBIFS_MAX_DATA_NODE_SZ;
7729eefe2a2SStefan Roese /*
7739eefe2a2SStefan Roese * Minimum indexing node size is amended later when superblock is
7749eefe2a2SStefan Roese * read and the key length is known.
7759eefe2a2SStefan Roese */
7769eefe2a2SStefan Roese c->ranges[UBIFS_IDX_NODE].min_len = UBIFS_IDX_NODE_SZ + UBIFS_BRANCH_SZ;
7779eefe2a2SStefan Roese /*
7789eefe2a2SStefan Roese * Maximum indexing node size is amended later when superblock is
7799eefe2a2SStefan Roese * read and the fanout is known.
7809eefe2a2SStefan Roese */
7819eefe2a2SStefan Roese c->ranges[UBIFS_IDX_NODE].max_len = INT_MAX;
7829eefe2a2SStefan Roese
7839eefe2a2SStefan Roese /*
7849eefe2a2SStefan Roese * Initialize dead and dark LEB space watermarks. See gc.c for comments
7859eefe2a2SStefan Roese * about these values.
7869eefe2a2SStefan Roese */
7879eefe2a2SStefan Roese c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size);
7889eefe2a2SStefan Roese c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size);
7899eefe2a2SStefan Roese
7909eefe2a2SStefan Roese /*
7919eefe2a2SStefan Roese * Calculate how many bytes would be wasted at the end of LEB if it was
7929eefe2a2SStefan Roese * fully filled with data nodes of maximum size. This is used in
7939eefe2a2SStefan Roese * calculations when reporting free space.
7949eefe2a2SStefan Roese */
7959eefe2a2SStefan Roese c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ;
7969eefe2a2SStefan Roese
797ff94bc40SHeiko Schocher /* Buffer size for bulk-reads */
798ff94bc40SHeiko Schocher c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ;
799ff94bc40SHeiko Schocher if (c->max_bu_buf_len > c->leb_size)
800ff94bc40SHeiko Schocher c->max_bu_buf_len = c->leb_size;
8019eefe2a2SStefan Roese return 0;
8029eefe2a2SStefan Roese }
8039eefe2a2SStefan Roese
804ff94bc40SHeiko Schocher /**
805ff94bc40SHeiko Schocher * bud_wbuf_callback - bud LEB write-buffer synchronization call-back.
806ff94bc40SHeiko Schocher * @c: UBIFS file-system description object
807ff94bc40SHeiko Schocher * @lnum: LEB the write-buffer was synchronized to
808ff94bc40SHeiko Schocher * @free: how many free bytes left in this LEB
809ff94bc40SHeiko Schocher * @pad: how many bytes were padded
810ff94bc40SHeiko Schocher *
811ff94bc40SHeiko Schocher * This is a callback function which is called by the I/O unit when the
812ff94bc40SHeiko Schocher * write-buffer is synchronized. We need this to correctly maintain space
813ff94bc40SHeiko Schocher * accounting in bud logical eraseblocks. This function returns zero in case of
814ff94bc40SHeiko Schocher * success and a negative error code in case of failure.
815ff94bc40SHeiko Schocher *
816ff94bc40SHeiko Schocher * This function actually belongs to the journal, but we keep it here because
817ff94bc40SHeiko Schocher * we want to keep it static.
818ff94bc40SHeiko Schocher */
bud_wbuf_callback(struct ubifs_info * c,int lnum,int free,int pad)819ff94bc40SHeiko Schocher static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad)
820ff94bc40SHeiko Schocher {
821ff94bc40SHeiko Schocher return ubifs_update_one_lp(c, lnum, free, pad, 0, 0);
822ff94bc40SHeiko Schocher }
823ff94bc40SHeiko Schocher
8249eefe2a2SStefan Roese /*
8259eefe2a2SStefan Roese * init_constants_sb - initialize UBIFS constants.
8269eefe2a2SStefan Roese * @c: UBIFS file-system description object
8279eefe2a2SStefan Roese *
8289eefe2a2SStefan Roese * This is a helper function which initializes various UBIFS constants after
8299eefe2a2SStefan Roese * the superblock has been read. It also checks various UBIFS parameters and
8309eefe2a2SStefan Roese * makes sure they are all right. Returns zero in case of success and a
8319eefe2a2SStefan Roese * negative error code in case of failure.
8329eefe2a2SStefan Roese */
init_constants_sb(struct ubifs_info * c)8339eefe2a2SStefan Roese static int init_constants_sb(struct ubifs_info *c)
8349eefe2a2SStefan Roese {
8359eefe2a2SStefan Roese int tmp, err;
8369eefe2a2SStefan Roese long long tmp64;
8379eefe2a2SStefan Roese
8389eefe2a2SStefan Roese c->main_bytes = (long long)c->main_lebs * c->leb_size;
8399eefe2a2SStefan Roese c->max_znode_sz = sizeof(struct ubifs_znode) +
8409eefe2a2SStefan Roese c->fanout * sizeof(struct ubifs_zbranch);
8419eefe2a2SStefan Roese
8429eefe2a2SStefan Roese tmp = ubifs_idx_node_sz(c, 1);
8439eefe2a2SStefan Roese c->ranges[UBIFS_IDX_NODE].min_len = tmp;
8449eefe2a2SStefan Roese c->min_idx_node_sz = ALIGN(tmp, 8);
8459eefe2a2SStefan Roese
8469eefe2a2SStefan Roese tmp = ubifs_idx_node_sz(c, c->fanout);
8479eefe2a2SStefan Roese c->ranges[UBIFS_IDX_NODE].max_len = tmp;
8489eefe2a2SStefan Roese c->max_idx_node_sz = ALIGN(tmp, 8);
8499eefe2a2SStefan Roese
8509eefe2a2SStefan Roese /* Make sure LEB size is large enough to fit full commit */
8519eefe2a2SStefan Roese tmp = UBIFS_CS_NODE_SZ + UBIFS_REF_NODE_SZ * c->jhead_cnt;
8529eefe2a2SStefan Roese tmp = ALIGN(tmp, c->min_io_size);
8539eefe2a2SStefan Roese if (tmp > c->leb_size) {
8540195a7bbSHeiko Schocher ubifs_err(c, "too small LEB size %d, at least %d needed",
8559eefe2a2SStefan Roese c->leb_size, tmp);
8569eefe2a2SStefan Roese return -EINVAL;
8579eefe2a2SStefan Roese }
8589eefe2a2SStefan Roese
8599eefe2a2SStefan Roese /*
8609eefe2a2SStefan Roese * Make sure that the log is large enough to fit reference nodes for
8619eefe2a2SStefan Roese * all buds plus one reserved LEB.
8629eefe2a2SStefan Roese */
8639eefe2a2SStefan Roese tmp64 = c->max_bud_bytes + c->leb_size - 1;
8649eefe2a2SStefan Roese c->max_bud_cnt = div_u64(tmp64, c->leb_size);
8659eefe2a2SStefan Roese tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1);
8669eefe2a2SStefan Roese tmp /= c->leb_size;
8679eefe2a2SStefan Roese tmp += 1;
8689eefe2a2SStefan Roese if (c->log_lebs < tmp) {
8690195a7bbSHeiko Schocher ubifs_err(c, "too small log %d LEBs, required min. %d LEBs",
8709eefe2a2SStefan Roese c->log_lebs, tmp);
8719eefe2a2SStefan Roese return -EINVAL;
8729eefe2a2SStefan Roese }
8739eefe2a2SStefan Roese
8749eefe2a2SStefan Roese /*
8759eefe2a2SStefan Roese * When budgeting we assume worst-case scenarios when the pages are not
8769eefe2a2SStefan Roese * be compressed and direntries are of the maximum size.
8779eefe2a2SStefan Roese *
8789eefe2a2SStefan Roese * Note, data, which may be stored in inodes is budgeted separately, so
879ff94bc40SHeiko Schocher * it is not included into 'c->bi.inode_budget'.
8809eefe2a2SStefan Roese */
881ff94bc40SHeiko Schocher c->bi.page_budget = UBIFS_MAX_DATA_NODE_SZ * UBIFS_BLOCKS_PER_PAGE;
882ff94bc40SHeiko Schocher c->bi.inode_budget = UBIFS_INO_NODE_SZ;
883ff94bc40SHeiko Schocher c->bi.dent_budget = UBIFS_MAX_DENT_NODE_SZ;
8849eefe2a2SStefan Roese
8859eefe2a2SStefan Roese /*
8869eefe2a2SStefan Roese * When the amount of flash space used by buds becomes
8879eefe2a2SStefan Roese * 'c->max_bud_bytes', UBIFS just blocks all writers and starts commit.
8889eefe2a2SStefan Roese * The writers are unblocked when the commit is finished. To avoid
8899eefe2a2SStefan Roese * writers to be blocked UBIFS initiates background commit in advance,
8909eefe2a2SStefan Roese * when number of bud bytes becomes above the limit defined below.
8919eefe2a2SStefan Roese */
8929eefe2a2SStefan Roese c->bg_bud_bytes = (c->max_bud_bytes * 13) >> 4;
8939eefe2a2SStefan Roese
8949eefe2a2SStefan Roese /*
8959eefe2a2SStefan Roese * Ensure minimum journal size. All the bytes in the journal heads are
8969eefe2a2SStefan Roese * considered to be used, when calculating the current journal usage.
8979eefe2a2SStefan Roese * Consequently, if the journal is too small, UBIFS will treat it as
8989eefe2a2SStefan Roese * always full.
8999eefe2a2SStefan Roese */
9009eefe2a2SStefan Roese tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1;
9019eefe2a2SStefan Roese if (c->bg_bud_bytes < tmp64)
9029eefe2a2SStefan Roese c->bg_bud_bytes = tmp64;
9039eefe2a2SStefan Roese if (c->max_bud_bytes < tmp64 + c->leb_size)
9049eefe2a2SStefan Roese c->max_bud_bytes = tmp64 + c->leb_size;
9059eefe2a2SStefan Roese
9069eefe2a2SStefan Roese err = ubifs_calc_lpt_geom(c);
9079eefe2a2SStefan Roese if (err)
9089eefe2a2SStefan Roese return err;
9099eefe2a2SStefan Roese
910ff94bc40SHeiko Schocher /* Initialize effective LEB size used in budgeting calculations */
911ff94bc40SHeiko Schocher c->idx_leb_size = c->leb_size - c->max_idx_node_sz;
9129eefe2a2SStefan Roese return 0;
9139eefe2a2SStefan Roese }
9149eefe2a2SStefan Roese
9159eefe2a2SStefan Roese /*
9169eefe2a2SStefan Roese * init_constants_master - initialize UBIFS constants.
9179eefe2a2SStefan Roese * @c: UBIFS file-system description object
9189eefe2a2SStefan Roese *
9199eefe2a2SStefan Roese * This is a helper function which initializes various UBIFS constants after
9209eefe2a2SStefan Roese * the master node has been read. It also checks various UBIFS parameters and
9219eefe2a2SStefan Roese * makes sure they are all right.
9229eefe2a2SStefan Roese */
init_constants_master(struct ubifs_info * c)9239eefe2a2SStefan Roese static void init_constants_master(struct ubifs_info *c)
9249eefe2a2SStefan Roese {
9259eefe2a2SStefan Roese long long tmp64;
9269eefe2a2SStefan Roese
927ff94bc40SHeiko Schocher c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c);
928ff94bc40SHeiko Schocher c->report_rp_size = ubifs_reported_space(c, c->rp_size);
9299eefe2a2SStefan Roese
9309eefe2a2SStefan Roese /*
9319eefe2a2SStefan Roese * Calculate total amount of FS blocks. This number is not used
9329eefe2a2SStefan Roese * internally because it does not make much sense for UBIFS, but it is
9339eefe2a2SStefan Roese * necessary to report something for the 'statfs()' call.
9349eefe2a2SStefan Roese *
9359eefe2a2SStefan Roese * Subtract the LEB reserved for GC, the LEB which is reserved for
9369eefe2a2SStefan Roese * deletions, minimum LEBs for the index, and assume only one journal
9379eefe2a2SStefan Roese * head is available.
9389eefe2a2SStefan Roese */
9399eefe2a2SStefan Roese tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1;
9409eefe2a2SStefan Roese tmp64 *= (long long)c->leb_size - c->leb_overhead;
9419eefe2a2SStefan Roese tmp64 = ubifs_reported_space(c, tmp64);
9429eefe2a2SStefan Roese c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT;
9439eefe2a2SStefan Roese }
9449eefe2a2SStefan Roese
9459eefe2a2SStefan Roese /**
946ff94bc40SHeiko Schocher * take_gc_lnum - reserve GC LEB.
947ff94bc40SHeiko Schocher * @c: UBIFS file-system description object
948ff94bc40SHeiko Schocher *
949ff94bc40SHeiko Schocher * This function ensures that the LEB reserved for garbage collection is marked
950ff94bc40SHeiko Schocher * as "taken" in lprops. We also have to set free space to LEB size and dirty
951ff94bc40SHeiko Schocher * space to zero, because lprops may contain out-of-date information if the
952ff94bc40SHeiko Schocher * file-system was un-mounted before it has been committed. This function
953ff94bc40SHeiko Schocher * returns zero in case of success and a negative error code in case of
954ff94bc40SHeiko Schocher * failure.
955ff94bc40SHeiko Schocher */
take_gc_lnum(struct ubifs_info * c)956ff94bc40SHeiko Schocher static int take_gc_lnum(struct ubifs_info *c)
957ff94bc40SHeiko Schocher {
958ff94bc40SHeiko Schocher int err;
959ff94bc40SHeiko Schocher
960ff94bc40SHeiko Schocher if (c->gc_lnum == -1) {
9610195a7bbSHeiko Schocher ubifs_err(c, "no LEB for GC");
962ff94bc40SHeiko Schocher return -EINVAL;
963ff94bc40SHeiko Schocher }
964ff94bc40SHeiko Schocher
965ff94bc40SHeiko Schocher /* And we have to tell lprops that this LEB is taken */
966ff94bc40SHeiko Schocher err = ubifs_change_one_lp(c, c->gc_lnum, c->leb_size, 0,
967ff94bc40SHeiko Schocher LPROPS_TAKEN, 0, 0);
968ff94bc40SHeiko Schocher return err;
969ff94bc40SHeiko Schocher }
970ff94bc40SHeiko Schocher
971ff94bc40SHeiko Schocher /**
972ff94bc40SHeiko Schocher * alloc_wbufs - allocate write-buffers.
973ff94bc40SHeiko Schocher * @c: UBIFS file-system description object
974ff94bc40SHeiko Schocher *
975ff94bc40SHeiko Schocher * This helper function allocates and initializes UBIFS write-buffers. Returns
976ff94bc40SHeiko Schocher * zero in case of success and %-ENOMEM in case of failure.
977ff94bc40SHeiko Schocher */
alloc_wbufs(struct ubifs_info * c)978ff94bc40SHeiko Schocher static int alloc_wbufs(struct ubifs_info *c)
979ff94bc40SHeiko Schocher {
980ff94bc40SHeiko Schocher int i, err;
981ff94bc40SHeiko Schocher
9820195a7bbSHeiko Schocher c->jheads = kcalloc(c->jhead_cnt, sizeof(struct ubifs_jhead),
983ff94bc40SHeiko Schocher GFP_KERNEL);
984ff94bc40SHeiko Schocher if (!c->jheads)
985ff94bc40SHeiko Schocher return -ENOMEM;
986ff94bc40SHeiko Schocher
987ff94bc40SHeiko Schocher /* Initialize journal heads */
988ff94bc40SHeiko Schocher for (i = 0; i < c->jhead_cnt; i++) {
989ff94bc40SHeiko Schocher INIT_LIST_HEAD(&c->jheads[i].buds_list);
990ff94bc40SHeiko Schocher err = ubifs_wbuf_init(c, &c->jheads[i].wbuf);
991ff94bc40SHeiko Schocher if (err)
992ff94bc40SHeiko Schocher return err;
993ff94bc40SHeiko Schocher
994ff94bc40SHeiko Schocher c->jheads[i].wbuf.sync_callback = &bud_wbuf_callback;
995ff94bc40SHeiko Schocher c->jheads[i].wbuf.jhead = i;
996ff94bc40SHeiko Schocher c->jheads[i].grouped = 1;
997ff94bc40SHeiko Schocher }
998ff94bc40SHeiko Schocher
999ff94bc40SHeiko Schocher /*
1000ff94bc40SHeiko Schocher * Garbage Collector head does not need to be synchronized by timer.
1001ff94bc40SHeiko Schocher * Also GC head nodes are not grouped.
1002ff94bc40SHeiko Schocher */
1003ff94bc40SHeiko Schocher c->jheads[GCHD].wbuf.no_timer = 1;
1004ff94bc40SHeiko Schocher c->jheads[GCHD].grouped = 0;
1005ff94bc40SHeiko Schocher
1006ff94bc40SHeiko Schocher return 0;
1007ff94bc40SHeiko Schocher }
1008ff94bc40SHeiko Schocher
1009ff94bc40SHeiko Schocher /**
1010ff94bc40SHeiko Schocher * free_wbufs - free write-buffers.
1011ff94bc40SHeiko Schocher * @c: UBIFS file-system description object
1012ff94bc40SHeiko Schocher */
free_wbufs(struct ubifs_info * c)1013ff94bc40SHeiko Schocher static void free_wbufs(struct ubifs_info *c)
1014ff94bc40SHeiko Schocher {
1015ff94bc40SHeiko Schocher int i;
1016ff94bc40SHeiko Schocher
1017ff94bc40SHeiko Schocher if (c->jheads) {
1018ff94bc40SHeiko Schocher for (i = 0; i < c->jhead_cnt; i++) {
1019ff94bc40SHeiko Schocher kfree(c->jheads[i].wbuf.buf);
1020ff94bc40SHeiko Schocher kfree(c->jheads[i].wbuf.inodes);
1021ff94bc40SHeiko Schocher }
1022ff94bc40SHeiko Schocher kfree(c->jheads);
1023ff94bc40SHeiko Schocher c->jheads = NULL;
1024ff94bc40SHeiko Schocher }
1025ff94bc40SHeiko Schocher }
1026ff94bc40SHeiko Schocher
1027ff94bc40SHeiko Schocher /**
10289eefe2a2SStefan Roese * free_orphans - free orphans.
10299eefe2a2SStefan Roese * @c: UBIFS file-system description object
10309eefe2a2SStefan Roese */
free_orphans(struct ubifs_info * c)10319eefe2a2SStefan Roese static void free_orphans(struct ubifs_info *c)
10329eefe2a2SStefan Roese {
10339eefe2a2SStefan Roese struct ubifs_orphan *orph;
10349eefe2a2SStefan Roese
10359eefe2a2SStefan Roese while (c->orph_dnext) {
10369eefe2a2SStefan Roese orph = c->orph_dnext;
10379eefe2a2SStefan Roese c->orph_dnext = orph->dnext;
10389eefe2a2SStefan Roese list_del(&orph->list);
10399eefe2a2SStefan Roese kfree(orph);
10409eefe2a2SStefan Roese }
10419eefe2a2SStefan Roese
10429eefe2a2SStefan Roese while (!list_empty(&c->orph_list)) {
10439eefe2a2SStefan Roese orph = list_entry(c->orph_list.next, struct ubifs_orphan, list);
10449eefe2a2SStefan Roese list_del(&orph->list);
10459eefe2a2SStefan Roese kfree(orph);
10460195a7bbSHeiko Schocher ubifs_err(c, "orphan list not empty at unmount");
10479eefe2a2SStefan Roese }
10489eefe2a2SStefan Roese
10499eefe2a2SStefan Roese vfree(c->orph_buf);
10509eefe2a2SStefan Roese c->orph_buf = NULL;
10519eefe2a2SStefan Roese }
10529eefe2a2SStefan Roese
1053ff94bc40SHeiko Schocher /**
1054ff94bc40SHeiko Schocher * free_buds - free per-bud objects.
1055ff94bc40SHeiko Schocher * @c: UBIFS file-system description object
1056ff94bc40SHeiko Schocher */
free_buds(struct ubifs_info * c)1057ff94bc40SHeiko Schocher static void free_buds(struct ubifs_info *c)
1058ff94bc40SHeiko Schocher {
1059ff94bc40SHeiko Schocher struct ubifs_bud *bud, *n;
1060ff94bc40SHeiko Schocher
1061ff94bc40SHeiko Schocher rbtree_postorder_for_each_entry_safe(bud, n, &c->buds, rb)
1062ff94bc40SHeiko Schocher kfree(bud);
1063ff94bc40SHeiko Schocher }
1064ff94bc40SHeiko Schocher
10659eefe2a2SStefan Roese /**
10669eefe2a2SStefan Roese * check_volume_empty - check if the UBI volume is empty.
10679eefe2a2SStefan Roese * @c: UBIFS file-system description object
10689eefe2a2SStefan Roese *
10699eefe2a2SStefan Roese * This function checks if the UBIFS volume is empty by looking if its LEBs are
10709eefe2a2SStefan Roese * mapped or not. The result of checking is stored in the @c->empty variable.
10719eefe2a2SStefan Roese * Returns zero in case of success and a negative error code in case of
10729eefe2a2SStefan Roese * failure.
10739eefe2a2SStefan Roese */
check_volume_empty(struct ubifs_info * c)10749eefe2a2SStefan Roese static int check_volume_empty(struct ubifs_info *c)
10759eefe2a2SStefan Roese {
10769eefe2a2SStefan Roese int lnum, err;
10779eefe2a2SStefan Roese
10789eefe2a2SStefan Roese c->empty = 1;
10799eefe2a2SStefan Roese for (lnum = 0; lnum < c->leb_cnt; lnum++) {
1080ff94bc40SHeiko Schocher err = ubifs_is_mapped(c, lnum);
10819eefe2a2SStefan Roese if (unlikely(err < 0))
10829eefe2a2SStefan Roese return err;
10839eefe2a2SStefan Roese if (err == 1) {
10849eefe2a2SStefan Roese c->empty = 0;
10859eefe2a2SStefan Roese break;
10869eefe2a2SStefan Roese }
10879eefe2a2SStefan Roese
10889eefe2a2SStefan Roese cond_resched();
10899eefe2a2SStefan Roese }
10909eefe2a2SStefan Roese
10919eefe2a2SStefan Roese return 0;
10929eefe2a2SStefan Roese }
10939eefe2a2SStefan Roese
1094ff94bc40SHeiko Schocher /*
1095ff94bc40SHeiko Schocher * UBIFS mount options.
1096ff94bc40SHeiko Schocher *
1097ff94bc40SHeiko Schocher * Opt_fast_unmount: do not run a journal commit before un-mounting
1098ff94bc40SHeiko Schocher * Opt_norm_unmount: run a journal commit before un-mounting
1099ff94bc40SHeiko Schocher * Opt_bulk_read: enable bulk-reads
1100ff94bc40SHeiko Schocher * Opt_no_bulk_read: disable bulk-reads
1101ff94bc40SHeiko Schocher * Opt_chk_data_crc: check CRCs when reading data nodes
1102ff94bc40SHeiko Schocher * Opt_no_chk_data_crc: do not check CRCs when reading data nodes
1103ff94bc40SHeiko Schocher * Opt_override_compr: override default compressor
1104ff94bc40SHeiko Schocher * Opt_err: just end of array marker
1105ff94bc40SHeiko Schocher */
1106ff94bc40SHeiko Schocher enum {
1107ff94bc40SHeiko Schocher Opt_fast_unmount,
1108ff94bc40SHeiko Schocher Opt_norm_unmount,
1109ff94bc40SHeiko Schocher Opt_bulk_read,
1110ff94bc40SHeiko Schocher Opt_no_bulk_read,
1111ff94bc40SHeiko Schocher Opt_chk_data_crc,
1112ff94bc40SHeiko Schocher Opt_no_chk_data_crc,
1113ff94bc40SHeiko Schocher Opt_override_compr,
1114ff94bc40SHeiko Schocher Opt_err,
1115ff94bc40SHeiko Schocher };
1116ff94bc40SHeiko Schocher
1117ff94bc40SHeiko Schocher #ifndef __UBOOT__
1118ff94bc40SHeiko Schocher static const match_table_t tokens = {
1119ff94bc40SHeiko Schocher {Opt_fast_unmount, "fast_unmount"},
1120ff94bc40SHeiko Schocher {Opt_norm_unmount, "norm_unmount"},
1121ff94bc40SHeiko Schocher {Opt_bulk_read, "bulk_read"},
1122ff94bc40SHeiko Schocher {Opt_no_bulk_read, "no_bulk_read"},
1123ff94bc40SHeiko Schocher {Opt_chk_data_crc, "chk_data_crc"},
1124ff94bc40SHeiko Schocher {Opt_no_chk_data_crc, "no_chk_data_crc"},
1125ff94bc40SHeiko Schocher {Opt_override_compr, "compr=%s"},
1126ff94bc40SHeiko Schocher {Opt_err, NULL},
1127ff94bc40SHeiko Schocher };
1128ff94bc40SHeiko Schocher
1129ff94bc40SHeiko Schocher /**
1130ff94bc40SHeiko Schocher * parse_standard_option - parse a standard mount option.
1131ff94bc40SHeiko Schocher * @option: the option to parse
1132ff94bc40SHeiko Schocher *
1133ff94bc40SHeiko Schocher * Normally, standard mount options like "sync" are passed to file-systems as
1134ff94bc40SHeiko Schocher * flags. However, when a "rootflags=" kernel boot parameter is used, they may
1135ff94bc40SHeiko Schocher * be present in the options string. This function tries to deal with this
1136ff94bc40SHeiko Schocher * situation and parse standard options. Returns 0 if the option was not
1137ff94bc40SHeiko Schocher * recognized, and the corresponding integer flag if it was.
1138ff94bc40SHeiko Schocher *
1139ff94bc40SHeiko Schocher * UBIFS is only interested in the "sync" option, so do not check for anything
1140ff94bc40SHeiko Schocher * else.
1141ff94bc40SHeiko Schocher */
parse_standard_option(const char * option)1142ff94bc40SHeiko Schocher static int parse_standard_option(const char *option)
1143ff94bc40SHeiko Schocher {
11440195a7bbSHeiko Schocher
11450195a7bbSHeiko Schocher pr_notice("UBIFS: parse %s\n", option);
1146ff94bc40SHeiko Schocher if (!strcmp(option, "sync"))
1147ff94bc40SHeiko Schocher return MS_SYNCHRONOUS;
1148ff94bc40SHeiko Schocher return 0;
1149ff94bc40SHeiko Schocher }
1150ff94bc40SHeiko Schocher
1151ff94bc40SHeiko Schocher /**
1152ff94bc40SHeiko Schocher * ubifs_parse_options - parse mount parameters.
1153ff94bc40SHeiko Schocher * @c: UBIFS file-system description object
1154ff94bc40SHeiko Schocher * @options: parameters to parse
1155ff94bc40SHeiko Schocher * @is_remount: non-zero if this is FS re-mount
1156ff94bc40SHeiko Schocher *
1157ff94bc40SHeiko Schocher * This function parses UBIFS mount options and returns zero in case success
1158ff94bc40SHeiko Schocher * and a negative error code in case of failure.
1159ff94bc40SHeiko Schocher */
ubifs_parse_options(struct ubifs_info * c,char * options,int is_remount)1160ff94bc40SHeiko Schocher static int ubifs_parse_options(struct ubifs_info *c, char *options,
1161ff94bc40SHeiko Schocher int is_remount)
1162ff94bc40SHeiko Schocher {
1163ff94bc40SHeiko Schocher char *p;
1164ff94bc40SHeiko Schocher substring_t args[MAX_OPT_ARGS];
1165ff94bc40SHeiko Schocher
1166ff94bc40SHeiko Schocher if (!options)
1167ff94bc40SHeiko Schocher return 0;
1168ff94bc40SHeiko Schocher
1169ff94bc40SHeiko Schocher while ((p = strsep(&options, ","))) {
1170ff94bc40SHeiko Schocher int token;
1171ff94bc40SHeiko Schocher
1172ff94bc40SHeiko Schocher if (!*p)
1173ff94bc40SHeiko Schocher continue;
1174ff94bc40SHeiko Schocher
1175ff94bc40SHeiko Schocher token = match_token(p, tokens, args);
1176ff94bc40SHeiko Schocher switch (token) {
1177ff94bc40SHeiko Schocher /*
1178ff94bc40SHeiko Schocher * %Opt_fast_unmount and %Opt_norm_unmount options are ignored.
1179ff94bc40SHeiko Schocher * We accept them in order to be backward-compatible. But this
1180ff94bc40SHeiko Schocher * should be removed at some point.
1181ff94bc40SHeiko Schocher */
1182ff94bc40SHeiko Schocher case Opt_fast_unmount:
1183ff94bc40SHeiko Schocher c->mount_opts.unmount_mode = 2;
1184ff94bc40SHeiko Schocher break;
1185ff94bc40SHeiko Schocher case Opt_norm_unmount:
1186ff94bc40SHeiko Schocher c->mount_opts.unmount_mode = 1;
1187ff94bc40SHeiko Schocher break;
1188ff94bc40SHeiko Schocher case Opt_bulk_read:
1189ff94bc40SHeiko Schocher c->mount_opts.bulk_read = 2;
1190ff94bc40SHeiko Schocher c->bulk_read = 1;
1191ff94bc40SHeiko Schocher break;
1192ff94bc40SHeiko Schocher case Opt_no_bulk_read:
1193ff94bc40SHeiko Schocher c->mount_opts.bulk_read = 1;
1194ff94bc40SHeiko Schocher c->bulk_read = 0;
1195ff94bc40SHeiko Schocher break;
1196ff94bc40SHeiko Schocher case Opt_chk_data_crc:
1197ff94bc40SHeiko Schocher c->mount_opts.chk_data_crc = 2;
1198ff94bc40SHeiko Schocher c->no_chk_data_crc = 0;
1199ff94bc40SHeiko Schocher break;
1200ff94bc40SHeiko Schocher case Opt_no_chk_data_crc:
1201ff94bc40SHeiko Schocher c->mount_opts.chk_data_crc = 1;
1202ff94bc40SHeiko Schocher c->no_chk_data_crc = 1;
1203ff94bc40SHeiko Schocher break;
1204ff94bc40SHeiko Schocher case Opt_override_compr:
1205ff94bc40SHeiko Schocher {
1206ff94bc40SHeiko Schocher char *name = match_strdup(&args[0]);
1207ff94bc40SHeiko Schocher
1208ff94bc40SHeiko Schocher if (!name)
1209ff94bc40SHeiko Schocher return -ENOMEM;
1210ff94bc40SHeiko Schocher if (!strcmp(name, "none"))
1211ff94bc40SHeiko Schocher c->mount_opts.compr_type = UBIFS_COMPR_NONE;
1212ff94bc40SHeiko Schocher else if (!strcmp(name, "lzo"))
1213ff94bc40SHeiko Schocher c->mount_opts.compr_type = UBIFS_COMPR_LZO;
1214ff94bc40SHeiko Schocher else if (!strcmp(name, "zlib"))
1215ff94bc40SHeiko Schocher c->mount_opts.compr_type = UBIFS_COMPR_ZLIB;
1216ff94bc40SHeiko Schocher else {
12170195a7bbSHeiko Schocher ubifs_err(c, "unknown compressor \"%s\"", name); //FIXME: is c ready?
1218ff94bc40SHeiko Schocher kfree(name);
1219ff94bc40SHeiko Schocher return -EINVAL;
1220ff94bc40SHeiko Schocher }
1221ff94bc40SHeiko Schocher kfree(name);
1222ff94bc40SHeiko Schocher c->mount_opts.override_compr = 1;
1223ff94bc40SHeiko Schocher c->default_compr = c->mount_opts.compr_type;
1224ff94bc40SHeiko Schocher break;
1225ff94bc40SHeiko Schocher }
1226ff94bc40SHeiko Schocher default:
1227ff94bc40SHeiko Schocher {
1228ff94bc40SHeiko Schocher unsigned long flag;
1229ff94bc40SHeiko Schocher struct super_block *sb = c->vfs_sb;
1230ff94bc40SHeiko Schocher
1231ff94bc40SHeiko Schocher flag = parse_standard_option(p);
1232ff94bc40SHeiko Schocher if (!flag) {
12330195a7bbSHeiko Schocher ubifs_err(c, "unrecognized mount option \"%s\" or missing value",
1234ff94bc40SHeiko Schocher p);
1235ff94bc40SHeiko Schocher return -EINVAL;
1236ff94bc40SHeiko Schocher }
1237ff94bc40SHeiko Schocher sb->s_flags |= flag;
1238ff94bc40SHeiko Schocher break;
1239ff94bc40SHeiko Schocher }
1240ff94bc40SHeiko Schocher }
1241ff94bc40SHeiko Schocher }
1242ff94bc40SHeiko Schocher
1243ff94bc40SHeiko Schocher return 0;
1244ff94bc40SHeiko Schocher }
1245040cc7b3SAnton Habegger #endif
1246ff94bc40SHeiko Schocher
1247ff94bc40SHeiko Schocher /**
1248ff94bc40SHeiko Schocher * destroy_journal - destroy journal data structures.
1249ff94bc40SHeiko Schocher * @c: UBIFS file-system description object
1250ff94bc40SHeiko Schocher *
1251ff94bc40SHeiko Schocher * This function destroys journal data structures including those that may have
1252ff94bc40SHeiko Schocher * been created by recovery functions.
1253ff94bc40SHeiko Schocher */
destroy_journal(struct ubifs_info * c)1254ff94bc40SHeiko Schocher static void destroy_journal(struct ubifs_info *c)
1255ff94bc40SHeiko Schocher {
1256ff94bc40SHeiko Schocher while (!list_empty(&c->unclean_leb_list)) {
1257ff94bc40SHeiko Schocher struct ubifs_unclean_leb *ucleb;
1258ff94bc40SHeiko Schocher
1259ff94bc40SHeiko Schocher ucleb = list_entry(c->unclean_leb_list.next,
1260ff94bc40SHeiko Schocher struct ubifs_unclean_leb, list);
1261ff94bc40SHeiko Schocher list_del(&ucleb->list);
1262ff94bc40SHeiko Schocher kfree(ucleb);
1263ff94bc40SHeiko Schocher }
1264ff94bc40SHeiko Schocher while (!list_empty(&c->old_buds)) {
1265ff94bc40SHeiko Schocher struct ubifs_bud *bud;
1266ff94bc40SHeiko Schocher
1267ff94bc40SHeiko Schocher bud = list_entry(c->old_buds.next, struct ubifs_bud, list);
1268ff94bc40SHeiko Schocher list_del(&bud->list);
1269ff94bc40SHeiko Schocher kfree(bud);
1270ff94bc40SHeiko Schocher }
1271ff94bc40SHeiko Schocher ubifs_destroy_idx_gc(c);
1272ff94bc40SHeiko Schocher ubifs_destroy_size_tree(c);
1273ff94bc40SHeiko Schocher ubifs_tnc_close(c);
1274ff94bc40SHeiko Schocher free_buds(c);
1275ff94bc40SHeiko Schocher }
1276ff94bc40SHeiko Schocher
1277ff94bc40SHeiko Schocher /**
1278ff94bc40SHeiko Schocher * bu_init - initialize bulk-read information.
1279ff94bc40SHeiko Schocher * @c: UBIFS file-system description object
1280ff94bc40SHeiko Schocher */
bu_init(struct ubifs_info * c)1281ff94bc40SHeiko Schocher static void bu_init(struct ubifs_info *c)
1282ff94bc40SHeiko Schocher {
1283ff94bc40SHeiko Schocher ubifs_assert(c->bulk_read == 1);
1284ff94bc40SHeiko Schocher
1285ff94bc40SHeiko Schocher if (c->bu.buf)
1286ff94bc40SHeiko Schocher return; /* Already initialized */
1287ff94bc40SHeiko Schocher
1288ff94bc40SHeiko Schocher again:
1289ff94bc40SHeiko Schocher c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN);
1290ff94bc40SHeiko Schocher if (!c->bu.buf) {
1291ff94bc40SHeiko Schocher if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) {
1292ff94bc40SHeiko Schocher c->max_bu_buf_len = UBIFS_KMALLOC_OK;
1293ff94bc40SHeiko Schocher goto again;
1294ff94bc40SHeiko Schocher }
1295ff94bc40SHeiko Schocher
1296ff94bc40SHeiko Schocher /* Just disable bulk-read */
12970195a7bbSHeiko Schocher ubifs_warn(c, "cannot allocate %d bytes of memory for bulk-read, disabling it",
1298ff94bc40SHeiko Schocher c->max_bu_buf_len);
1299ff94bc40SHeiko Schocher c->mount_opts.bulk_read = 1;
1300ff94bc40SHeiko Schocher c->bulk_read = 0;
1301ff94bc40SHeiko Schocher return;
1302ff94bc40SHeiko Schocher }
1303ff94bc40SHeiko Schocher }
1304ff94bc40SHeiko Schocher
1305ff94bc40SHeiko Schocher #ifndef __UBOOT__
1306ff94bc40SHeiko Schocher /**
1307ff94bc40SHeiko Schocher * check_free_space - check if there is enough free space to mount.
1308ff94bc40SHeiko Schocher * @c: UBIFS file-system description object
1309ff94bc40SHeiko Schocher *
1310ff94bc40SHeiko Schocher * This function makes sure UBIFS has enough free space to be mounted in
1311ff94bc40SHeiko Schocher * read/write mode. UBIFS must always have some free space to allow deletions.
1312ff94bc40SHeiko Schocher */
check_free_space(struct ubifs_info * c)1313ff94bc40SHeiko Schocher static int check_free_space(struct ubifs_info *c)
1314ff94bc40SHeiko Schocher {
1315ff94bc40SHeiko Schocher ubifs_assert(c->dark_wm > 0);
1316ff94bc40SHeiko Schocher if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) {
13170195a7bbSHeiko Schocher ubifs_err(c, "insufficient free space to mount in R/W mode");
1318ff94bc40SHeiko Schocher ubifs_dump_budg(c, &c->bi);
1319ff94bc40SHeiko Schocher ubifs_dump_lprops(c);
1320ff94bc40SHeiko Schocher return -ENOSPC;
1321ff94bc40SHeiko Schocher }
1322ff94bc40SHeiko Schocher return 0;
1323ff94bc40SHeiko Schocher }
1324ff94bc40SHeiko Schocher #endif
1325ff94bc40SHeiko Schocher
13269eefe2a2SStefan Roese /**
13279eefe2a2SStefan Roese * mount_ubifs - mount UBIFS file-system.
13289eefe2a2SStefan Roese * @c: UBIFS file-system description object
13299eefe2a2SStefan Roese *
13309eefe2a2SStefan Roese * This function mounts UBIFS file system. Returns zero in case of success and
13319eefe2a2SStefan Roese * a negative error code in case of failure.
13329eefe2a2SStefan Roese */
mount_ubifs(struct ubifs_info * c)13339eefe2a2SStefan Roese static int mount_ubifs(struct ubifs_info *c)
13349eefe2a2SStefan Roese {
1335ff94bc40SHeiko Schocher int err;
1336afb6fda2SPetr Vorel long long x;
1337afb6fda2SPetr Vorel #ifndef CONFIG_UBIFS_SILENCE_MSG
1338afb6fda2SPetr Vorel long long y;
1339afb6fda2SPetr Vorel #endif
13409eefe2a2SStefan Roese size_t sz;
13419eefe2a2SStefan Roese
1342ff94bc40SHeiko Schocher c->ro_mount = !!(c->vfs_sb->s_flags & MS_RDONLY);
13430195a7bbSHeiko Schocher /* Suppress error messages while probing if MS_SILENT is set */
13440195a7bbSHeiko Schocher c->probing = !!(c->vfs_sb->s_flags & MS_SILENT);
1345ff94bc40SHeiko Schocher #ifdef __UBOOT__
1346ff94bc40SHeiko Schocher if (!c->ro_mount) {
1347ff94bc40SHeiko Schocher printf("UBIFS: only ro mode in U-Boot allowed.\n");
1348ff94bc40SHeiko Schocher return -EACCES;
1349ff94bc40SHeiko Schocher }
1350ff94bc40SHeiko Schocher #endif
1351ff94bc40SHeiko Schocher
13529eefe2a2SStefan Roese err = init_constants_early(c);
13539eefe2a2SStefan Roese if (err)
13549eefe2a2SStefan Roese return err;
13559eefe2a2SStefan Roese
13569eefe2a2SStefan Roese err = ubifs_debugging_init(c);
13579eefe2a2SStefan Roese if (err)
13589eefe2a2SStefan Roese return err;
13599eefe2a2SStefan Roese
13609eefe2a2SStefan Roese err = check_volume_empty(c);
13619eefe2a2SStefan Roese if (err)
13629eefe2a2SStefan Roese goto out_free;
13639eefe2a2SStefan Roese
1364ff94bc40SHeiko Schocher if (c->empty && (c->ro_mount || c->ro_media)) {
13659eefe2a2SStefan Roese /*
13669eefe2a2SStefan Roese * This UBI volume is empty, and read-only, or the file system
13679eefe2a2SStefan Roese * is mounted read-only - we cannot format it.
13689eefe2a2SStefan Roese */
13690195a7bbSHeiko Schocher ubifs_err(c, "can't format empty UBI volume: read-only %s",
13709eefe2a2SStefan Roese c->ro_media ? "UBI volume" : "mount");
13719eefe2a2SStefan Roese err = -EROFS;
13729eefe2a2SStefan Roese goto out_free;
13739eefe2a2SStefan Roese }
13749eefe2a2SStefan Roese
1375ff94bc40SHeiko Schocher if (c->ro_media && !c->ro_mount) {
13760195a7bbSHeiko Schocher ubifs_err(c, "cannot mount read-write - read-only media");
13779eefe2a2SStefan Roese err = -EROFS;
13789eefe2a2SStefan Roese goto out_free;
13799eefe2a2SStefan Roese }
13809eefe2a2SStefan Roese
13819eefe2a2SStefan Roese /*
13829eefe2a2SStefan Roese * The requirement for the buffer is that it should fit indexing B-tree
13839eefe2a2SStefan Roese * height amount of integers. We assume the height if the TNC tree will
13849eefe2a2SStefan Roese * never exceed 64.
13859eefe2a2SStefan Roese */
13869eefe2a2SStefan Roese err = -ENOMEM;
13879eefe2a2SStefan Roese c->bottom_up_buf = kmalloc(BOTTOM_UP_HEIGHT * sizeof(int), GFP_KERNEL);
13889eefe2a2SStefan Roese if (!c->bottom_up_buf)
13899eefe2a2SStefan Roese goto out_free;
13909eefe2a2SStefan Roese
13919eefe2a2SStefan Roese c->sbuf = vmalloc(c->leb_size);
13929eefe2a2SStefan Roese if (!c->sbuf)
13939eefe2a2SStefan Roese goto out_free;
13949eefe2a2SStefan Roese
1395ff94bc40SHeiko Schocher #ifndef __UBOOT__
1396ff94bc40SHeiko Schocher if (!c->ro_mount) {
1397ff94bc40SHeiko Schocher c->ileb_buf = vmalloc(c->leb_size);
1398ff94bc40SHeiko Schocher if (!c->ileb_buf)
1399ff94bc40SHeiko Schocher goto out_free;
1400ff94bc40SHeiko Schocher }
1401ff94bc40SHeiko Schocher #endif
1402ff94bc40SHeiko Schocher
1403ff94bc40SHeiko Schocher if (c->bulk_read == 1)
1404ff94bc40SHeiko Schocher bu_init(c);
1405ff94bc40SHeiko Schocher
1406ff94bc40SHeiko Schocher #ifndef __UBOOT__
1407ff94bc40SHeiko Schocher if (!c->ro_mount) {
1408ff94bc40SHeiko Schocher c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ,
1409ff94bc40SHeiko Schocher GFP_KERNEL);
1410ff94bc40SHeiko Schocher if (!c->write_reserve_buf)
1411ff94bc40SHeiko Schocher goto out_free;
1412ff94bc40SHeiko Schocher }
1413ff94bc40SHeiko Schocher #endif
1414ff94bc40SHeiko Schocher
1415ff94bc40SHeiko Schocher c->mounting = 1;
14169eefe2a2SStefan Roese
14179eefe2a2SStefan Roese err = ubifs_read_superblock(c);
14189eefe2a2SStefan Roese if (err)
14199eefe2a2SStefan Roese goto out_free;
14209eefe2a2SStefan Roese
14210195a7bbSHeiko Schocher c->probing = 0;
14220195a7bbSHeiko Schocher
14239eefe2a2SStefan Roese /*
14249eefe2a2SStefan Roese * Make sure the compressor which is set as default in the superblock
14259eefe2a2SStefan Roese * or overridden by mount options is actually compiled in.
14269eefe2a2SStefan Roese */
14279eefe2a2SStefan Roese if (!ubifs_compr_present(c->default_compr)) {
14280195a7bbSHeiko Schocher ubifs_err(c, "'compressor \"%s\" is not compiled in",
14299eefe2a2SStefan Roese ubifs_compr_name(c->default_compr));
1430ff94bc40SHeiko Schocher err = -ENOTSUPP;
14319eefe2a2SStefan Roese goto out_free;
14329eefe2a2SStefan Roese }
14339eefe2a2SStefan Roese
14349eefe2a2SStefan Roese err = init_constants_sb(c);
14359eefe2a2SStefan Roese if (err)
14369eefe2a2SStefan Roese goto out_free;
14379eefe2a2SStefan Roese
14389eefe2a2SStefan Roese sz = ALIGN(c->max_idx_node_sz, c->min_io_size);
14399eefe2a2SStefan Roese sz = ALIGN(sz + c->max_idx_node_sz, c->min_io_size);
14409eefe2a2SStefan Roese c->cbuf = kmalloc(sz, GFP_NOFS);
14419eefe2a2SStefan Roese if (!c->cbuf) {
14429eefe2a2SStefan Roese err = -ENOMEM;
14439eefe2a2SStefan Roese goto out_free;
14449eefe2a2SStefan Roese }
14459eefe2a2SStefan Roese
1446ff94bc40SHeiko Schocher err = alloc_wbufs(c);
1447ff94bc40SHeiko Schocher if (err)
1448ff94bc40SHeiko Schocher goto out_cbuf;
1449ff94bc40SHeiko Schocher
14509eefe2a2SStefan Roese sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id);
1451ff94bc40SHeiko Schocher #ifndef __UBOOT__
1452ff94bc40SHeiko Schocher if (!c->ro_mount) {
1453ff94bc40SHeiko Schocher /* Create background thread */
1454ff94bc40SHeiko Schocher c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name);
1455ff94bc40SHeiko Schocher if (IS_ERR(c->bgt)) {
1456ff94bc40SHeiko Schocher err = PTR_ERR(c->bgt);
1457ff94bc40SHeiko Schocher c->bgt = NULL;
14580195a7bbSHeiko Schocher ubifs_err(c, "cannot spawn \"%s\", error %d",
1459ff94bc40SHeiko Schocher c->bgt_name, err);
1460ff94bc40SHeiko Schocher goto out_wbufs;
1461ff94bc40SHeiko Schocher }
1462ff94bc40SHeiko Schocher wake_up_process(c->bgt);
1463ff94bc40SHeiko Schocher }
1464ff94bc40SHeiko Schocher #endif
14659eefe2a2SStefan Roese
14669eefe2a2SStefan Roese err = ubifs_read_master(c);
14679eefe2a2SStefan Roese if (err)
14689eefe2a2SStefan Roese goto out_master;
14699eefe2a2SStefan Roese
14709eefe2a2SStefan Roese init_constants_master(c);
14719eefe2a2SStefan Roese
14729eefe2a2SStefan Roese if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) {
14730195a7bbSHeiko Schocher ubifs_msg(c, "recovery needed");
14749eefe2a2SStefan Roese c->need_recovery = 1;
14759eefe2a2SStefan Roese }
14769eefe2a2SStefan Roese
1477ff94bc40SHeiko Schocher #ifndef __UBOOT__
1478ff94bc40SHeiko Schocher if (c->need_recovery && !c->ro_mount) {
1479ff94bc40SHeiko Schocher err = ubifs_recover_inl_heads(c, c->sbuf);
1480ff94bc40SHeiko Schocher if (err)
1481ff94bc40SHeiko Schocher goto out_master;
1482ff94bc40SHeiko Schocher }
1483ff94bc40SHeiko Schocher #endif
1484ff94bc40SHeiko Schocher
1485ff94bc40SHeiko Schocher err = ubifs_lpt_init(c, 1, !c->ro_mount);
1486ff94bc40SHeiko Schocher if (err)
1487ff94bc40SHeiko Schocher goto out_master;
1488ff94bc40SHeiko Schocher
1489ff94bc40SHeiko Schocher #ifndef __UBOOT__
1490ff94bc40SHeiko Schocher if (!c->ro_mount && c->space_fixup) {
1491ff94bc40SHeiko Schocher err = ubifs_fixup_free_space(c);
1492ff94bc40SHeiko Schocher if (err)
1493ff94bc40SHeiko Schocher goto out_lpt;
1494ff94bc40SHeiko Schocher }
1495ff94bc40SHeiko Schocher
14960195a7bbSHeiko Schocher if (!c->ro_mount && !c->need_recovery) {
1497ff94bc40SHeiko Schocher /*
1498ff94bc40SHeiko Schocher * Set the "dirty" flag so that if we reboot uncleanly we
1499ff94bc40SHeiko Schocher * will notice this immediately on the next mount.
1500ff94bc40SHeiko Schocher */
1501ff94bc40SHeiko Schocher c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
1502ff94bc40SHeiko Schocher err = ubifs_write_master(c);
1503ff94bc40SHeiko Schocher if (err)
1504ff94bc40SHeiko Schocher goto out_lpt;
1505ff94bc40SHeiko Schocher }
1506ff94bc40SHeiko Schocher #endif
1507ff94bc40SHeiko Schocher
1508ff94bc40SHeiko Schocher err = dbg_check_idx_size(c, c->bi.old_idx_sz);
15099eefe2a2SStefan Roese if (err)
15109eefe2a2SStefan Roese goto out_lpt;
15119eefe2a2SStefan Roese
15129eefe2a2SStefan Roese err = ubifs_replay_journal(c);
15139eefe2a2SStefan Roese if (err)
15149eefe2a2SStefan Roese goto out_journal;
15159eefe2a2SStefan Roese
1516ff94bc40SHeiko Schocher /* Calculate 'min_idx_lebs' after journal replay */
1517ff94bc40SHeiko Schocher c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c);
1518ff94bc40SHeiko Schocher
1519ff94bc40SHeiko Schocher err = ubifs_mount_orphans(c, c->need_recovery, c->ro_mount);
15209eefe2a2SStefan Roese if (err)
15219eefe2a2SStefan Roese goto out_orphans;
15229eefe2a2SStefan Roese
1523ff94bc40SHeiko Schocher if (!c->ro_mount) {
1524ff94bc40SHeiko Schocher #ifndef __UBOOT__
1525ff94bc40SHeiko Schocher int lnum;
1526ff94bc40SHeiko Schocher
1527ff94bc40SHeiko Schocher err = check_free_space(c);
1528ff94bc40SHeiko Schocher if (err)
1529ff94bc40SHeiko Schocher goto out_orphans;
1530ff94bc40SHeiko Schocher
1531ff94bc40SHeiko Schocher /* Check for enough log space */
1532ff94bc40SHeiko Schocher lnum = c->lhead_lnum + 1;
1533ff94bc40SHeiko Schocher if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
1534ff94bc40SHeiko Schocher lnum = UBIFS_LOG_LNUM;
1535ff94bc40SHeiko Schocher if (lnum == c->ltail_lnum) {
1536ff94bc40SHeiko Schocher err = ubifs_consolidate_log(c);
1537ff94bc40SHeiko Schocher if (err)
1538ff94bc40SHeiko Schocher goto out_orphans;
1539ff94bc40SHeiko Schocher }
1540ff94bc40SHeiko Schocher
15419eefe2a2SStefan Roese if (c->need_recovery) {
15429eefe2a2SStefan Roese err = ubifs_recover_size(c);
15439eefe2a2SStefan Roese if (err)
15449eefe2a2SStefan Roese goto out_orphans;
1545ff94bc40SHeiko Schocher err = ubifs_rcvry_gc_commit(c);
1546ff94bc40SHeiko Schocher if (err)
1547ff94bc40SHeiko Schocher goto out_orphans;
1548ff94bc40SHeiko Schocher } else {
1549ff94bc40SHeiko Schocher err = take_gc_lnum(c);
1550ff94bc40SHeiko Schocher if (err)
1551ff94bc40SHeiko Schocher goto out_orphans;
1552ff94bc40SHeiko Schocher
1553ff94bc40SHeiko Schocher /*
1554ff94bc40SHeiko Schocher * GC LEB may contain garbage if there was an unclean
1555ff94bc40SHeiko Schocher * reboot, and it should be un-mapped.
1556ff94bc40SHeiko Schocher */
1557ff94bc40SHeiko Schocher err = ubifs_leb_unmap(c, c->gc_lnum);
1558ff94bc40SHeiko Schocher if (err)
1559ff94bc40SHeiko Schocher goto out_orphans;
15609eefe2a2SStefan Roese }
15619eefe2a2SStefan Roese
1562ff94bc40SHeiko Schocher err = dbg_check_lprops(c);
1563ff94bc40SHeiko Schocher if (err)
1564ff94bc40SHeiko Schocher goto out_orphans;
1565ff94bc40SHeiko Schocher #endif
1566ff94bc40SHeiko Schocher } else if (c->need_recovery) {
1567ff94bc40SHeiko Schocher err = ubifs_recover_size(c);
1568ff94bc40SHeiko Schocher if (err)
1569ff94bc40SHeiko Schocher goto out_orphans;
1570ff94bc40SHeiko Schocher } else {
1571ff94bc40SHeiko Schocher /*
1572ff94bc40SHeiko Schocher * Even if we mount read-only, we have to set space in GC LEB
1573ff94bc40SHeiko Schocher * to proper value because this affects UBIFS free space
1574ff94bc40SHeiko Schocher * reporting. We do not want to have a situation when
1575ff94bc40SHeiko Schocher * re-mounting from R/O to R/W changes amount of free space.
1576ff94bc40SHeiko Schocher */
1577ff94bc40SHeiko Schocher err = take_gc_lnum(c);
1578ff94bc40SHeiko Schocher if (err)
1579ff94bc40SHeiko Schocher goto out_orphans;
1580ff94bc40SHeiko Schocher }
1581ff94bc40SHeiko Schocher
1582ff94bc40SHeiko Schocher #ifndef __UBOOT__
15839eefe2a2SStefan Roese spin_lock(&ubifs_infos_lock);
15849eefe2a2SStefan Roese list_add_tail(&c->infos_list, &ubifs_infos);
15859eefe2a2SStefan Roese spin_unlock(&ubifs_infos_lock);
1586ff94bc40SHeiko Schocher #endif
15879eefe2a2SStefan Roese
15889eefe2a2SStefan Roese if (c->need_recovery) {
1589ff94bc40SHeiko Schocher if (c->ro_mount)
15900195a7bbSHeiko Schocher ubifs_msg(c, "recovery deferred");
15919eefe2a2SStefan Roese else {
15929eefe2a2SStefan Roese c->need_recovery = 0;
15930195a7bbSHeiko Schocher ubifs_msg(c, "recovery completed");
1594ff94bc40SHeiko Schocher /*
1595ff94bc40SHeiko Schocher * GC LEB has to be empty and taken at this point. But
1596ff94bc40SHeiko Schocher * the journal head LEBs may also be accounted as
1597ff94bc40SHeiko Schocher * "empty taken" if they are empty.
1598ff94bc40SHeiko Schocher */
1599ff94bc40SHeiko Schocher ubifs_assert(c->lst.taken_empty_lebs > 0);
16009eefe2a2SStefan Roese }
1601ff94bc40SHeiko Schocher } else
1602ff94bc40SHeiko Schocher ubifs_assert(c->lst.taken_empty_lebs > 0);
16039eefe2a2SStefan Roese
16049eefe2a2SStefan Roese err = dbg_check_filesystem(c);
16059eefe2a2SStefan Roese if (err)
16069eefe2a2SStefan Roese goto out_infos;
16079eefe2a2SStefan Roese
1608ff94bc40SHeiko Schocher err = dbg_debugfs_init_fs(c);
1609ff94bc40SHeiko Schocher if (err)
1610ff94bc40SHeiko Schocher goto out_infos;
16119eefe2a2SStefan Roese
1612ff94bc40SHeiko Schocher c->mounting = 0;
1613ff94bc40SHeiko Schocher
16140195a7bbSHeiko Schocher ubifs_msg(c, "UBIFS: mounted UBI device %d, volume %d, name \"%s\"%s",
1615ff94bc40SHeiko Schocher c->vi.ubi_num, c->vi.vol_id, c->vi.name,
1616ff94bc40SHeiko Schocher c->ro_mount ? ", R/O mode" : "");
16179eefe2a2SStefan Roese x = (long long)c->main_lebs * c->leb_size;
1618afb6fda2SPetr Vorel #ifndef CONFIG_UBIFS_SILENCE_MSG
1619ff94bc40SHeiko Schocher y = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes;
1620afb6fda2SPetr Vorel #endif
16210195a7bbSHeiko Schocher ubifs_msg(c, "LEB size: %d bytes (%d KiB), min./max. I/O unit sizes: %d bytes/%d bytes",
1622ff94bc40SHeiko Schocher c->leb_size, c->leb_size >> 10, c->min_io_size,
1623ff94bc40SHeiko Schocher c->max_write_size);
16240195a7bbSHeiko Schocher ubifs_msg(c, "FS size: %lld bytes (%lld MiB, %d LEBs), journal size %lld bytes (%lld MiB, %d LEBs)",
1625ff94bc40SHeiko Schocher x, x >> 20, c->main_lebs,
1626ff94bc40SHeiko Schocher y, y >> 20, c->log_lebs + c->max_bud_cnt);
16270195a7bbSHeiko Schocher ubifs_msg(c, "reserved for root: %llu bytes (%llu KiB)",
16289eefe2a2SStefan Roese c->report_rp_size, c->report_rp_size >> 10);
16290195a7bbSHeiko Schocher ubifs_msg(c, "media format: w%d/r%d (latest is w%d/r%d), UUID %pUB%s",
1630ff94bc40SHeiko Schocher c->fmt_version, c->ro_compat_version,
1631ff94bc40SHeiko Schocher UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION, c->uuid,
1632ff94bc40SHeiko Schocher c->big_lpt ? ", big LPT model" : ", small LPT model");
16339eefe2a2SStefan Roese
1634ff94bc40SHeiko Schocher dbg_gen("default compressor: %s", ubifs_compr_name(c->default_compr));
1635ff94bc40SHeiko Schocher dbg_gen("data journal heads: %d",
16369eefe2a2SStefan Roese c->jhead_cnt - NONDATA_JHEADS_CNT);
1637ff94bc40SHeiko Schocher dbg_gen("log LEBs: %d (%d - %d)",
16389eefe2a2SStefan Roese c->log_lebs, UBIFS_LOG_LNUM, c->log_last);
1639ff94bc40SHeiko Schocher dbg_gen("LPT area LEBs: %d (%d - %d)",
16409eefe2a2SStefan Roese c->lpt_lebs, c->lpt_first, c->lpt_last);
1641ff94bc40SHeiko Schocher dbg_gen("orphan area LEBs: %d (%d - %d)",
16429eefe2a2SStefan Roese c->orph_lebs, c->orph_first, c->orph_last);
1643ff94bc40SHeiko Schocher dbg_gen("main area LEBs: %d (%d - %d)",
16449eefe2a2SStefan Roese c->main_lebs, c->main_first, c->leb_cnt - 1);
1645ff94bc40SHeiko Schocher dbg_gen("index LEBs: %d", c->lst.idx_lebs);
1646ff94bc40SHeiko Schocher dbg_gen("total index bytes: %lld (%lld KiB, %lld MiB)",
1647ff94bc40SHeiko Schocher c->bi.old_idx_sz, c->bi.old_idx_sz >> 10,
1648ff94bc40SHeiko Schocher c->bi.old_idx_sz >> 20);
1649ff94bc40SHeiko Schocher dbg_gen("key hash type: %d", c->key_hash_type);
1650ff94bc40SHeiko Schocher dbg_gen("tree fanout: %d", c->fanout);
1651ff94bc40SHeiko Schocher dbg_gen("reserved GC LEB: %d", c->gc_lnum);
1652ff94bc40SHeiko Schocher dbg_gen("max. znode size %d", c->max_znode_sz);
1653ff94bc40SHeiko Schocher dbg_gen("max. index node size %d", c->max_idx_node_sz);
1654ff94bc40SHeiko Schocher dbg_gen("node sizes: data %zu, inode %zu, dentry %zu",
16559eefe2a2SStefan Roese UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ);
1656ff94bc40SHeiko Schocher dbg_gen("node sizes: trun %zu, sb %zu, master %zu",
16579eefe2a2SStefan Roese UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ);
1658ff94bc40SHeiko Schocher dbg_gen("node sizes: ref %zu, cmt. start %zu, orph %zu",
16599eefe2a2SStefan Roese UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ);
1660ff94bc40SHeiko Schocher dbg_gen("max. node sizes: data %zu, inode %zu dentry %zu, idx %d",
16619eefe2a2SStefan Roese UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ,
1662ff94bc40SHeiko Schocher UBIFS_MAX_DENT_NODE_SZ, ubifs_idx_node_sz(c, c->fanout));
1663ff94bc40SHeiko Schocher dbg_gen("dead watermark: %d", c->dead_wm);
1664ff94bc40SHeiko Schocher dbg_gen("dark watermark: %d", c->dark_wm);
1665ff94bc40SHeiko Schocher dbg_gen("LEB overhead: %d", c->leb_overhead);
16669eefe2a2SStefan Roese x = (long long)c->main_lebs * c->dark_wm;
1667ff94bc40SHeiko Schocher dbg_gen("max. dark space: %lld (%lld KiB, %lld MiB)",
16689eefe2a2SStefan Roese x, x >> 10, x >> 20);
1669ff94bc40SHeiko Schocher dbg_gen("maximum bud bytes: %lld (%lld KiB, %lld MiB)",
16709eefe2a2SStefan Roese c->max_bud_bytes, c->max_bud_bytes >> 10,
16719eefe2a2SStefan Roese c->max_bud_bytes >> 20);
1672ff94bc40SHeiko Schocher dbg_gen("BG commit bud bytes: %lld (%lld KiB, %lld MiB)",
16739eefe2a2SStefan Roese c->bg_bud_bytes, c->bg_bud_bytes >> 10,
16749eefe2a2SStefan Roese c->bg_bud_bytes >> 20);
1675ff94bc40SHeiko Schocher dbg_gen("current bud bytes %lld (%lld KiB, %lld MiB)",
16769eefe2a2SStefan Roese c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20);
1677ff94bc40SHeiko Schocher dbg_gen("max. seq. number: %llu", c->max_sqnum);
1678ff94bc40SHeiko Schocher dbg_gen("commit number: %llu", c->cmt_no);
16799eefe2a2SStefan Roese
16809eefe2a2SStefan Roese return 0;
16819eefe2a2SStefan Roese
16829eefe2a2SStefan Roese out_infos:
16839eefe2a2SStefan Roese spin_lock(&ubifs_infos_lock);
16849eefe2a2SStefan Roese list_del(&c->infos_list);
16859eefe2a2SStefan Roese spin_unlock(&ubifs_infos_lock);
16869eefe2a2SStefan Roese out_orphans:
16879eefe2a2SStefan Roese free_orphans(c);
16889eefe2a2SStefan Roese out_journal:
1689ff94bc40SHeiko Schocher destroy_journal(c);
16909eefe2a2SStefan Roese out_lpt:
16919eefe2a2SStefan Roese ubifs_lpt_free(c, 0);
16929eefe2a2SStefan Roese out_master:
16939eefe2a2SStefan Roese kfree(c->mst_node);
16949eefe2a2SStefan Roese kfree(c->rcvrd_mst_node);
16959eefe2a2SStefan Roese if (c->bgt)
16969eefe2a2SStefan Roese kthread_stop(c->bgt);
1697ff94bc40SHeiko Schocher #ifndef __UBOOT__
1698ff94bc40SHeiko Schocher out_wbufs:
1699ff94bc40SHeiko Schocher #endif
1700ff94bc40SHeiko Schocher free_wbufs(c);
1701ff94bc40SHeiko Schocher out_cbuf:
17029eefe2a2SStefan Roese kfree(c->cbuf);
17039eefe2a2SStefan Roese out_free:
1704ff94bc40SHeiko Schocher kfree(c->write_reserve_buf);
1705ff94bc40SHeiko Schocher kfree(c->bu.buf);
17069eefe2a2SStefan Roese vfree(c->ileb_buf);
17079eefe2a2SStefan Roese vfree(c->sbuf);
17089eefe2a2SStefan Roese kfree(c->bottom_up_buf);
17099eefe2a2SStefan Roese ubifs_debugging_exit(c);
17109eefe2a2SStefan Roese return err;
17119eefe2a2SStefan Roese }
17129eefe2a2SStefan Roese
17139eefe2a2SStefan Roese /**
17149eefe2a2SStefan Roese * ubifs_umount - un-mount UBIFS file-system.
17159eefe2a2SStefan Roese * @c: UBIFS file-system description object
17169eefe2a2SStefan Roese *
17179eefe2a2SStefan Roese * Note, this function is called to free allocated resourced when un-mounting,
17189eefe2a2SStefan Roese * as well as free resources when an error occurred while we were half way
17199eefe2a2SStefan Roese * through mounting (error path cleanup function). So it has to make sure the
17209eefe2a2SStefan Roese * resource was actually allocated before freeing it.
17219eefe2a2SStefan Roese */
1722ff94bc40SHeiko Schocher #ifndef __UBOOT__
ubifs_umount(struct ubifs_info * c)1723ff94bc40SHeiko Schocher static void ubifs_umount(struct ubifs_info *c)
1724ff94bc40SHeiko Schocher #else
1725cb9c09d4SStefan Roese void ubifs_umount(struct ubifs_info *c)
1726ff94bc40SHeiko Schocher #endif
17279eefe2a2SStefan Roese {
17289eefe2a2SStefan Roese dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num,
17299eefe2a2SStefan Roese c->vi.vol_id);
17309eefe2a2SStefan Roese
1731ff94bc40SHeiko Schocher dbg_debugfs_exit_fs(c);
17329eefe2a2SStefan Roese spin_lock(&ubifs_infos_lock);
17339eefe2a2SStefan Roese list_del(&c->infos_list);
17349eefe2a2SStefan Roese spin_unlock(&ubifs_infos_lock);
17359eefe2a2SStefan Roese
1736ff94bc40SHeiko Schocher #ifndef __UBOOT__
17379eefe2a2SStefan Roese if (c->bgt)
17389eefe2a2SStefan Roese kthread_stop(c->bgt);
17399eefe2a2SStefan Roese
1740ff94bc40SHeiko Schocher destroy_journal(c);
1741ff94bc40SHeiko Schocher #endif
1742ff94bc40SHeiko Schocher free_wbufs(c);
17439eefe2a2SStefan Roese free_orphans(c);
17449eefe2a2SStefan Roese ubifs_lpt_free(c, 0);
17459eefe2a2SStefan Roese
17469eefe2a2SStefan Roese kfree(c->cbuf);
17479eefe2a2SStefan Roese kfree(c->rcvrd_mst_node);
17489eefe2a2SStefan Roese kfree(c->mst_node);
1749ff94bc40SHeiko Schocher kfree(c->write_reserve_buf);
1750ff94bc40SHeiko Schocher kfree(c->bu.buf);
17519eefe2a2SStefan Roese vfree(c->ileb_buf);
17529eefe2a2SStefan Roese vfree(c->sbuf);
17539eefe2a2SStefan Roese kfree(c->bottom_up_buf);
17549eefe2a2SStefan Roese ubifs_debugging_exit(c);
1755ff94bc40SHeiko Schocher #ifdef __UBOOT__
17569eefe2a2SStefan Roese /* Finally free U-Boot's global copy of superblock */
1757349a8d5eSLars Poeschel if (ubifs_sb != NULL) {
17589eefe2a2SStefan Roese free(ubifs_sb->s_fs_info);
17599eefe2a2SStefan Roese free(ubifs_sb);
17609eefe2a2SStefan Roese }
1761ff94bc40SHeiko Schocher #endif
1762349a8d5eSLars Poeschel }
17639eefe2a2SStefan Roese
1764ff94bc40SHeiko Schocher #ifndef __UBOOT__
1765ff94bc40SHeiko Schocher /**
1766ff94bc40SHeiko Schocher * ubifs_remount_rw - re-mount in read-write mode.
1767ff94bc40SHeiko Schocher * @c: UBIFS file-system description object
1768ff94bc40SHeiko Schocher *
1769ff94bc40SHeiko Schocher * UBIFS avoids allocating many unnecessary resources when mounted in read-only
1770ff94bc40SHeiko Schocher * mode. This function allocates the needed resources and re-mounts UBIFS in
1771ff94bc40SHeiko Schocher * read-write mode.
1772ff94bc40SHeiko Schocher */
ubifs_remount_rw(struct ubifs_info * c)1773ff94bc40SHeiko Schocher static int ubifs_remount_rw(struct ubifs_info *c)
1774ff94bc40SHeiko Schocher {
1775ff94bc40SHeiko Schocher int err, lnum;
1776ff94bc40SHeiko Schocher
1777ff94bc40SHeiko Schocher if (c->rw_incompat) {
17780195a7bbSHeiko Schocher ubifs_err(c, "the file-system is not R/W-compatible");
17790195a7bbSHeiko Schocher ubifs_msg(c, "on-flash format version is w%d/r%d, but software only supports up to version w%d/r%d",
1780ff94bc40SHeiko Schocher c->fmt_version, c->ro_compat_version,
1781ff94bc40SHeiko Schocher UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION);
1782ff94bc40SHeiko Schocher return -EROFS;
1783ff94bc40SHeiko Schocher }
1784ff94bc40SHeiko Schocher
1785ff94bc40SHeiko Schocher mutex_lock(&c->umount_mutex);
1786ff94bc40SHeiko Schocher dbg_save_space_info(c);
1787ff94bc40SHeiko Schocher c->remounting_rw = 1;
1788ff94bc40SHeiko Schocher c->ro_mount = 0;
1789ff94bc40SHeiko Schocher
1790ff94bc40SHeiko Schocher if (c->space_fixup) {
1791ff94bc40SHeiko Schocher err = ubifs_fixup_free_space(c);
1792ff94bc40SHeiko Schocher if (err)
17934e67c571SHeiko Schocher goto out;
1794ff94bc40SHeiko Schocher }
1795ff94bc40SHeiko Schocher
1796ff94bc40SHeiko Schocher err = check_free_space(c);
1797ff94bc40SHeiko Schocher if (err)
1798ff94bc40SHeiko Schocher goto out;
1799ff94bc40SHeiko Schocher
1800ff94bc40SHeiko Schocher if (c->old_leb_cnt != c->leb_cnt) {
1801ff94bc40SHeiko Schocher struct ubifs_sb_node *sup;
1802ff94bc40SHeiko Schocher
1803ff94bc40SHeiko Schocher sup = ubifs_read_sb_node(c);
1804ff94bc40SHeiko Schocher if (IS_ERR(sup)) {
1805ff94bc40SHeiko Schocher err = PTR_ERR(sup);
1806ff94bc40SHeiko Schocher goto out;
1807ff94bc40SHeiko Schocher }
1808ff94bc40SHeiko Schocher sup->leb_cnt = cpu_to_le32(c->leb_cnt);
1809ff94bc40SHeiko Schocher err = ubifs_write_sb_node(c, sup);
1810ff94bc40SHeiko Schocher kfree(sup);
1811ff94bc40SHeiko Schocher if (err)
1812ff94bc40SHeiko Schocher goto out;
1813ff94bc40SHeiko Schocher }
1814ff94bc40SHeiko Schocher
1815ff94bc40SHeiko Schocher if (c->need_recovery) {
18160195a7bbSHeiko Schocher ubifs_msg(c, "completing deferred recovery");
1817ff94bc40SHeiko Schocher err = ubifs_write_rcvrd_mst_node(c);
1818ff94bc40SHeiko Schocher if (err)
1819ff94bc40SHeiko Schocher goto out;
1820ff94bc40SHeiko Schocher err = ubifs_recover_size(c);
1821ff94bc40SHeiko Schocher if (err)
1822ff94bc40SHeiko Schocher goto out;
1823ff94bc40SHeiko Schocher err = ubifs_clean_lebs(c, c->sbuf);
1824ff94bc40SHeiko Schocher if (err)
1825ff94bc40SHeiko Schocher goto out;
1826ff94bc40SHeiko Schocher err = ubifs_recover_inl_heads(c, c->sbuf);
1827ff94bc40SHeiko Schocher if (err)
1828ff94bc40SHeiko Schocher goto out;
1829ff94bc40SHeiko Schocher } else {
1830ff94bc40SHeiko Schocher /* A readonly mount is not allowed to have orphans */
1831ff94bc40SHeiko Schocher ubifs_assert(c->tot_orphans == 0);
1832ff94bc40SHeiko Schocher err = ubifs_clear_orphans(c);
1833ff94bc40SHeiko Schocher if (err)
1834ff94bc40SHeiko Schocher goto out;
1835ff94bc40SHeiko Schocher }
1836ff94bc40SHeiko Schocher
1837ff94bc40SHeiko Schocher if (!(c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY))) {
1838ff94bc40SHeiko Schocher c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
1839ff94bc40SHeiko Schocher err = ubifs_write_master(c);
1840ff94bc40SHeiko Schocher if (err)
1841ff94bc40SHeiko Schocher goto out;
1842ff94bc40SHeiko Schocher }
1843ff94bc40SHeiko Schocher
1844ff94bc40SHeiko Schocher c->ileb_buf = vmalloc(c->leb_size);
1845ff94bc40SHeiko Schocher if (!c->ileb_buf) {
1846ff94bc40SHeiko Schocher err = -ENOMEM;
1847ff94bc40SHeiko Schocher goto out;
1848ff94bc40SHeiko Schocher }
1849ff94bc40SHeiko Schocher
1850ff94bc40SHeiko Schocher c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ, GFP_KERNEL);
1851ff94bc40SHeiko Schocher if (!c->write_reserve_buf) {
1852ff94bc40SHeiko Schocher err = -ENOMEM;
1853ff94bc40SHeiko Schocher goto out;
1854ff94bc40SHeiko Schocher }
1855ff94bc40SHeiko Schocher
1856ff94bc40SHeiko Schocher err = ubifs_lpt_init(c, 0, 1);
1857ff94bc40SHeiko Schocher if (err)
1858ff94bc40SHeiko Schocher goto out;
1859ff94bc40SHeiko Schocher
1860ff94bc40SHeiko Schocher /* Create background thread */
1861ff94bc40SHeiko Schocher c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name);
1862ff94bc40SHeiko Schocher if (IS_ERR(c->bgt)) {
1863ff94bc40SHeiko Schocher err = PTR_ERR(c->bgt);
1864ff94bc40SHeiko Schocher c->bgt = NULL;
18650195a7bbSHeiko Schocher ubifs_err(c, "cannot spawn \"%s\", error %d",
1866ff94bc40SHeiko Schocher c->bgt_name, err);
1867ff94bc40SHeiko Schocher goto out;
1868ff94bc40SHeiko Schocher }
1869ff94bc40SHeiko Schocher wake_up_process(c->bgt);
1870ff94bc40SHeiko Schocher
1871ff94bc40SHeiko Schocher c->orph_buf = vmalloc(c->leb_size);
1872ff94bc40SHeiko Schocher if (!c->orph_buf) {
1873ff94bc40SHeiko Schocher err = -ENOMEM;
1874ff94bc40SHeiko Schocher goto out;
1875ff94bc40SHeiko Schocher }
1876ff94bc40SHeiko Schocher
1877ff94bc40SHeiko Schocher /* Check for enough log space */
1878ff94bc40SHeiko Schocher lnum = c->lhead_lnum + 1;
1879ff94bc40SHeiko Schocher if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
1880ff94bc40SHeiko Schocher lnum = UBIFS_LOG_LNUM;
1881ff94bc40SHeiko Schocher if (lnum == c->ltail_lnum) {
1882ff94bc40SHeiko Schocher err = ubifs_consolidate_log(c);
1883ff94bc40SHeiko Schocher if (err)
1884ff94bc40SHeiko Schocher goto out;
1885ff94bc40SHeiko Schocher }
1886ff94bc40SHeiko Schocher
1887ff94bc40SHeiko Schocher if (c->need_recovery)
1888ff94bc40SHeiko Schocher err = ubifs_rcvry_gc_commit(c);
1889ff94bc40SHeiko Schocher else
1890ff94bc40SHeiko Schocher err = ubifs_leb_unmap(c, c->gc_lnum);
1891ff94bc40SHeiko Schocher if (err)
1892ff94bc40SHeiko Schocher goto out;
1893ff94bc40SHeiko Schocher
1894ff94bc40SHeiko Schocher dbg_gen("re-mounted read-write");
1895ff94bc40SHeiko Schocher c->remounting_rw = 0;
1896ff94bc40SHeiko Schocher
1897ff94bc40SHeiko Schocher if (c->need_recovery) {
1898ff94bc40SHeiko Schocher c->need_recovery = 0;
18990195a7bbSHeiko Schocher ubifs_msg(c, "deferred recovery completed");
1900ff94bc40SHeiko Schocher } else {
1901ff94bc40SHeiko Schocher /*
1902ff94bc40SHeiko Schocher * Do not run the debugging space check if the were doing
1903ff94bc40SHeiko Schocher * recovery, because when we saved the information we had the
1904ff94bc40SHeiko Schocher * file-system in a state where the TNC and lprops has been
1905ff94bc40SHeiko Schocher * modified in memory, but all the I/O operations (including a
1906ff94bc40SHeiko Schocher * commit) were deferred. So the file-system was in
1907ff94bc40SHeiko Schocher * "non-committed" state. Now the file-system is in committed
1908ff94bc40SHeiko Schocher * state, and of course the amount of free space will change
1909ff94bc40SHeiko Schocher * because, for example, the old index size was imprecise.
1910ff94bc40SHeiko Schocher */
1911ff94bc40SHeiko Schocher err = dbg_check_space_info(c);
1912ff94bc40SHeiko Schocher }
1913ff94bc40SHeiko Schocher
1914ff94bc40SHeiko Schocher mutex_unlock(&c->umount_mutex);
1915ff94bc40SHeiko Schocher return err;
1916ff94bc40SHeiko Schocher
1917ff94bc40SHeiko Schocher out:
1918ff94bc40SHeiko Schocher c->ro_mount = 1;
1919ff94bc40SHeiko Schocher vfree(c->orph_buf);
1920ff94bc40SHeiko Schocher c->orph_buf = NULL;
1921ff94bc40SHeiko Schocher if (c->bgt) {
1922ff94bc40SHeiko Schocher kthread_stop(c->bgt);
1923ff94bc40SHeiko Schocher c->bgt = NULL;
1924ff94bc40SHeiko Schocher }
1925ff94bc40SHeiko Schocher free_wbufs(c);
1926ff94bc40SHeiko Schocher kfree(c->write_reserve_buf);
1927ff94bc40SHeiko Schocher c->write_reserve_buf = NULL;
1928ff94bc40SHeiko Schocher vfree(c->ileb_buf);
1929ff94bc40SHeiko Schocher c->ileb_buf = NULL;
1930ff94bc40SHeiko Schocher ubifs_lpt_free(c, 1);
1931ff94bc40SHeiko Schocher c->remounting_rw = 0;
1932ff94bc40SHeiko Schocher mutex_unlock(&c->umount_mutex);
1933ff94bc40SHeiko Schocher return err;
1934ff94bc40SHeiko Schocher }
1935ff94bc40SHeiko Schocher
1936ff94bc40SHeiko Schocher /**
1937ff94bc40SHeiko Schocher * ubifs_remount_ro - re-mount in read-only mode.
1938ff94bc40SHeiko Schocher * @c: UBIFS file-system description object
1939ff94bc40SHeiko Schocher *
1940ff94bc40SHeiko Schocher * We assume VFS has stopped writing. Possibly the background thread could be
1941ff94bc40SHeiko Schocher * running a commit, however kthread_stop will wait in that case.
1942ff94bc40SHeiko Schocher */
ubifs_remount_ro(struct ubifs_info * c)1943ff94bc40SHeiko Schocher static void ubifs_remount_ro(struct ubifs_info *c)
1944ff94bc40SHeiko Schocher {
1945ff94bc40SHeiko Schocher int i, err;
1946ff94bc40SHeiko Schocher
1947ff94bc40SHeiko Schocher ubifs_assert(!c->need_recovery);
1948ff94bc40SHeiko Schocher ubifs_assert(!c->ro_mount);
1949ff94bc40SHeiko Schocher
1950ff94bc40SHeiko Schocher mutex_lock(&c->umount_mutex);
1951ff94bc40SHeiko Schocher if (c->bgt) {
1952ff94bc40SHeiko Schocher kthread_stop(c->bgt);
1953ff94bc40SHeiko Schocher c->bgt = NULL;
1954ff94bc40SHeiko Schocher }
1955ff94bc40SHeiko Schocher
1956ff94bc40SHeiko Schocher dbg_save_space_info(c);
1957ff94bc40SHeiko Schocher
1958ff94bc40SHeiko Schocher for (i = 0; i < c->jhead_cnt; i++)
1959ff94bc40SHeiko Schocher ubifs_wbuf_sync(&c->jheads[i].wbuf);
1960ff94bc40SHeiko Schocher
1961ff94bc40SHeiko Schocher c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
1962ff94bc40SHeiko Schocher c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
1963ff94bc40SHeiko Schocher c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
1964ff94bc40SHeiko Schocher err = ubifs_write_master(c);
1965ff94bc40SHeiko Schocher if (err)
1966ff94bc40SHeiko Schocher ubifs_ro_mode(c, err);
1967ff94bc40SHeiko Schocher
1968ff94bc40SHeiko Schocher vfree(c->orph_buf);
1969ff94bc40SHeiko Schocher c->orph_buf = NULL;
1970ff94bc40SHeiko Schocher kfree(c->write_reserve_buf);
1971ff94bc40SHeiko Schocher c->write_reserve_buf = NULL;
1972ff94bc40SHeiko Schocher vfree(c->ileb_buf);
1973ff94bc40SHeiko Schocher c->ileb_buf = NULL;
1974ff94bc40SHeiko Schocher ubifs_lpt_free(c, 1);
1975ff94bc40SHeiko Schocher c->ro_mount = 1;
1976ff94bc40SHeiko Schocher err = dbg_check_space_info(c);
1977ff94bc40SHeiko Schocher if (err)
1978ff94bc40SHeiko Schocher ubifs_ro_mode(c, err);
1979ff94bc40SHeiko Schocher mutex_unlock(&c->umount_mutex);
1980ff94bc40SHeiko Schocher }
1981ff94bc40SHeiko Schocher
ubifs_put_super(struct super_block * sb)1982ff94bc40SHeiko Schocher static void ubifs_put_super(struct super_block *sb)
1983ff94bc40SHeiko Schocher {
1984ff94bc40SHeiko Schocher int i;
1985ff94bc40SHeiko Schocher struct ubifs_info *c = sb->s_fs_info;
1986ff94bc40SHeiko Schocher
19870195a7bbSHeiko Schocher ubifs_msg(c, "un-mount UBI device %d", c->vi.ubi_num);
1988ff94bc40SHeiko Schocher
1989ff94bc40SHeiko Schocher /*
1990ff94bc40SHeiko Schocher * The following asserts are only valid if there has not been a failure
1991ff94bc40SHeiko Schocher * of the media. For example, there will be dirty inodes if we failed
1992ff94bc40SHeiko Schocher * to write them back because of I/O errors.
1993ff94bc40SHeiko Schocher */
1994ff94bc40SHeiko Schocher if (!c->ro_error) {
1995ff94bc40SHeiko Schocher ubifs_assert(c->bi.idx_growth == 0);
1996ff94bc40SHeiko Schocher ubifs_assert(c->bi.dd_growth == 0);
1997ff94bc40SHeiko Schocher ubifs_assert(c->bi.data_growth == 0);
1998ff94bc40SHeiko Schocher }
1999ff94bc40SHeiko Schocher
2000ff94bc40SHeiko Schocher /*
2001ff94bc40SHeiko Schocher * The 'c->umount_lock' prevents races between UBIFS memory shrinker
2002ff94bc40SHeiko Schocher * and file system un-mount. Namely, it prevents the shrinker from
2003ff94bc40SHeiko Schocher * picking this superblock for shrinking - it will be just skipped if
2004ff94bc40SHeiko Schocher * the mutex is locked.
2005ff94bc40SHeiko Schocher */
2006ff94bc40SHeiko Schocher mutex_lock(&c->umount_mutex);
2007ff94bc40SHeiko Schocher if (!c->ro_mount) {
2008ff94bc40SHeiko Schocher /*
2009ff94bc40SHeiko Schocher * First of all kill the background thread to make sure it does
2010ff94bc40SHeiko Schocher * not interfere with un-mounting and freeing resources.
2011ff94bc40SHeiko Schocher */
2012ff94bc40SHeiko Schocher if (c->bgt) {
2013ff94bc40SHeiko Schocher kthread_stop(c->bgt);
2014ff94bc40SHeiko Schocher c->bgt = NULL;
2015ff94bc40SHeiko Schocher }
2016ff94bc40SHeiko Schocher
2017ff94bc40SHeiko Schocher /*
2018ff94bc40SHeiko Schocher * On fatal errors c->ro_error is set to 1, in which case we do
2019ff94bc40SHeiko Schocher * not write the master node.
2020ff94bc40SHeiko Schocher */
2021ff94bc40SHeiko Schocher if (!c->ro_error) {
2022ff94bc40SHeiko Schocher int err;
2023ff94bc40SHeiko Schocher
2024ff94bc40SHeiko Schocher /* Synchronize write-buffers */
2025ff94bc40SHeiko Schocher for (i = 0; i < c->jhead_cnt; i++)
2026ff94bc40SHeiko Schocher ubifs_wbuf_sync(&c->jheads[i].wbuf);
2027ff94bc40SHeiko Schocher
2028ff94bc40SHeiko Schocher /*
2029ff94bc40SHeiko Schocher * We are being cleanly unmounted which means the
2030ff94bc40SHeiko Schocher * orphans were killed - indicate this in the master
2031ff94bc40SHeiko Schocher * node. Also save the reserved GC LEB number.
2032ff94bc40SHeiko Schocher */
2033ff94bc40SHeiko Schocher c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
2034ff94bc40SHeiko Schocher c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
2035ff94bc40SHeiko Schocher c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
2036ff94bc40SHeiko Schocher err = ubifs_write_master(c);
2037ff94bc40SHeiko Schocher if (err)
2038ff94bc40SHeiko Schocher /*
2039ff94bc40SHeiko Schocher * Recovery will attempt to fix the master area
2040ff94bc40SHeiko Schocher * next mount, so we just print a message and
2041ff94bc40SHeiko Schocher * continue to unmount normally.
2042ff94bc40SHeiko Schocher */
20430195a7bbSHeiko Schocher ubifs_err(c, "failed to write master node, error %d",
2044ff94bc40SHeiko Schocher err);
2045ff94bc40SHeiko Schocher } else {
2046ff94bc40SHeiko Schocher #ifndef __UBOOT__
2047ff94bc40SHeiko Schocher for (i = 0; i < c->jhead_cnt; i++)
2048ff94bc40SHeiko Schocher /* Make sure write-buffer timers are canceled */
2049ff94bc40SHeiko Schocher hrtimer_cancel(&c->jheads[i].wbuf.timer);
2050ff94bc40SHeiko Schocher #endif
2051ff94bc40SHeiko Schocher }
2052ff94bc40SHeiko Schocher }
2053ff94bc40SHeiko Schocher
2054ff94bc40SHeiko Schocher ubifs_umount(c);
2055ff94bc40SHeiko Schocher #ifndef __UBOOT__
2056ff94bc40SHeiko Schocher bdi_destroy(&c->bdi);
2057ff94bc40SHeiko Schocher #endif
2058ff94bc40SHeiko Schocher ubi_close_volume(c->ubi);
2059ff94bc40SHeiko Schocher mutex_unlock(&c->umount_mutex);
2060ff94bc40SHeiko Schocher }
2061ff94bc40SHeiko Schocher #endif
2062ff94bc40SHeiko Schocher
2063ff94bc40SHeiko Schocher #ifndef __UBOOT__
ubifs_remount_fs(struct super_block * sb,int * flags,char * data)2064ff94bc40SHeiko Schocher static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data)
2065ff94bc40SHeiko Schocher {
2066ff94bc40SHeiko Schocher int err;
2067ff94bc40SHeiko Schocher struct ubifs_info *c = sb->s_fs_info;
2068ff94bc40SHeiko Schocher
20694e67c571SHeiko Schocher sync_filesystem(sb);
2070ff94bc40SHeiko Schocher dbg_gen("old flags %#lx, new flags %#x", sb->s_flags, *flags);
2071ff94bc40SHeiko Schocher
2072ff94bc40SHeiko Schocher err = ubifs_parse_options(c, data, 1);
2073ff94bc40SHeiko Schocher if (err) {
20740195a7bbSHeiko Schocher ubifs_err(c, "invalid or unknown remount parameter");
2075ff94bc40SHeiko Schocher return err;
2076ff94bc40SHeiko Schocher }
2077ff94bc40SHeiko Schocher
2078ff94bc40SHeiko Schocher if (c->ro_mount && !(*flags & MS_RDONLY)) {
2079ff94bc40SHeiko Schocher if (c->ro_error) {
20800195a7bbSHeiko Schocher ubifs_msg(c, "cannot re-mount R/W due to prior errors");
2081ff94bc40SHeiko Schocher return -EROFS;
2082ff94bc40SHeiko Schocher }
2083ff94bc40SHeiko Schocher if (c->ro_media) {
20840195a7bbSHeiko Schocher ubifs_msg(c, "cannot re-mount R/W - UBI volume is R/O");
2085ff94bc40SHeiko Schocher return -EROFS;
2086ff94bc40SHeiko Schocher }
2087ff94bc40SHeiko Schocher err = ubifs_remount_rw(c);
2088ff94bc40SHeiko Schocher if (err)
2089ff94bc40SHeiko Schocher return err;
2090ff94bc40SHeiko Schocher } else if (!c->ro_mount && (*flags & MS_RDONLY)) {
2091ff94bc40SHeiko Schocher if (c->ro_error) {
20920195a7bbSHeiko Schocher ubifs_msg(c, "cannot re-mount R/O due to prior errors");
2093ff94bc40SHeiko Schocher return -EROFS;
2094ff94bc40SHeiko Schocher }
2095ff94bc40SHeiko Schocher ubifs_remount_ro(c);
2096ff94bc40SHeiko Schocher }
2097ff94bc40SHeiko Schocher
2098ff94bc40SHeiko Schocher if (c->bulk_read == 1)
2099ff94bc40SHeiko Schocher bu_init(c);
2100ff94bc40SHeiko Schocher else {
2101ff94bc40SHeiko Schocher dbg_gen("disable bulk-read");
2102ff94bc40SHeiko Schocher kfree(c->bu.buf);
2103ff94bc40SHeiko Schocher c->bu.buf = NULL;
2104ff94bc40SHeiko Schocher }
2105ff94bc40SHeiko Schocher
2106ff94bc40SHeiko Schocher ubifs_assert(c->lst.taken_empty_lebs > 0);
2107ff94bc40SHeiko Schocher return 0;
2108ff94bc40SHeiko Schocher }
2109ff94bc40SHeiko Schocher #endif
2110ff94bc40SHeiko Schocher
2111ff94bc40SHeiko Schocher const struct super_operations ubifs_super_operations = {
2112ff94bc40SHeiko Schocher .alloc_inode = ubifs_alloc_inode,
2113ff94bc40SHeiko Schocher #ifndef __UBOOT__
2114ff94bc40SHeiko Schocher .destroy_inode = ubifs_destroy_inode,
2115ff94bc40SHeiko Schocher .put_super = ubifs_put_super,
2116ff94bc40SHeiko Schocher .write_inode = ubifs_write_inode,
2117ff94bc40SHeiko Schocher .evict_inode = ubifs_evict_inode,
2118ff94bc40SHeiko Schocher .statfs = ubifs_statfs,
2119ff94bc40SHeiko Schocher #endif
2120ff94bc40SHeiko Schocher .dirty_inode = ubifs_dirty_inode,
2121ff94bc40SHeiko Schocher #ifndef __UBOOT__
2122ff94bc40SHeiko Schocher .remount_fs = ubifs_remount_fs,
2123ff94bc40SHeiko Schocher .show_options = ubifs_show_options,
2124ff94bc40SHeiko Schocher .sync_fs = ubifs_sync_fs,
2125ff94bc40SHeiko Schocher #endif
2126ff94bc40SHeiko Schocher };
2127ff94bc40SHeiko Schocher
21289eefe2a2SStefan Roese /**
21299eefe2a2SStefan Roese * open_ubi - parse UBI device name string and open the UBI device.
21309eefe2a2SStefan Roese * @name: UBI volume name
21319eefe2a2SStefan Roese * @mode: UBI volume open mode
21329eefe2a2SStefan Roese *
2133ff94bc40SHeiko Schocher * The primary method of mounting UBIFS is by specifying the UBI volume
2134ff94bc40SHeiko Schocher * character device node path. However, UBIFS may also be mounted withoug any
2135ff94bc40SHeiko Schocher * character device node using one of the following methods:
2136ff94bc40SHeiko Schocher *
2137ff94bc40SHeiko Schocher * o ubiX_Y - mount UBI device number X, volume Y;
2138ff94bc40SHeiko Schocher * o ubiY - mount UBI device number 0, volume Y;
21399eefe2a2SStefan Roese * o ubiX:NAME - mount UBI device X, volume with name NAME;
21409eefe2a2SStefan Roese * o ubi:NAME - mount UBI device 0, volume with name NAME.
21419eefe2a2SStefan Roese *
21429eefe2a2SStefan Roese * Alternative '!' separator may be used instead of ':' (because some shells
21439eefe2a2SStefan Roese * like busybox may interpret ':' as an NFS host name separator). This function
2144ff94bc40SHeiko Schocher * returns UBI volume description object in case of success and a negative
2145ff94bc40SHeiko Schocher * error code in case of failure.
21469eefe2a2SStefan Roese */
open_ubi(const char * name,int mode)21479eefe2a2SStefan Roese static struct ubi_volume_desc *open_ubi(const char *name, int mode)
21489eefe2a2SStefan Roese {
2149ff94bc40SHeiko Schocher #ifndef __UBOOT__
2150ff94bc40SHeiko Schocher struct ubi_volume_desc *ubi;
2151ff94bc40SHeiko Schocher #endif
21529eefe2a2SStefan Roese int dev, vol;
21539eefe2a2SStefan Roese char *endptr;
21549eefe2a2SStefan Roese
2155ff94bc40SHeiko Schocher #ifndef __UBOOT__
2156ff94bc40SHeiko Schocher /* First, try to open using the device node path method */
2157ff94bc40SHeiko Schocher ubi = ubi_open_volume_path(name, mode);
2158ff94bc40SHeiko Schocher if (!IS_ERR(ubi))
2159ff94bc40SHeiko Schocher return ubi;
2160ff94bc40SHeiko Schocher #endif
2161ff94bc40SHeiko Schocher
2162ff94bc40SHeiko Schocher /* Try the "nodev" method */
21639eefe2a2SStefan Roese if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i')
21649eefe2a2SStefan Roese return ERR_PTR(-EINVAL);
21659eefe2a2SStefan Roese
21669eefe2a2SStefan Roese /* ubi:NAME method */
21679eefe2a2SStefan Roese if ((name[3] == ':' || name[3] == '!') && name[4] != '\0')
21689eefe2a2SStefan Roese return ubi_open_volume_nm(0, name + 4, mode);
21699eefe2a2SStefan Roese
21709eefe2a2SStefan Roese if (!isdigit(name[3]))
21719eefe2a2SStefan Roese return ERR_PTR(-EINVAL);
21729eefe2a2SStefan Roese
21739eefe2a2SStefan Roese dev = simple_strtoul(name + 3, &endptr, 0);
21749eefe2a2SStefan Roese
21759eefe2a2SStefan Roese /* ubiY method */
21769eefe2a2SStefan Roese if (*endptr == '\0')
21779eefe2a2SStefan Roese return ubi_open_volume(0, dev, mode);
21789eefe2a2SStefan Roese
21799eefe2a2SStefan Roese /* ubiX_Y method */
21809eefe2a2SStefan Roese if (*endptr == '_' && isdigit(endptr[1])) {
21819eefe2a2SStefan Roese vol = simple_strtoul(endptr + 1, &endptr, 0);
21829eefe2a2SStefan Roese if (*endptr != '\0')
21839eefe2a2SStefan Roese return ERR_PTR(-EINVAL);
21849eefe2a2SStefan Roese return ubi_open_volume(dev, vol, mode);
21859eefe2a2SStefan Roese }
21869eefe2a2SStefan Roese
21879eefe2a2SStefan Roese /* ubiX:NAME method */
21889eefe2a2SStefan Roese if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0')
21899eefe2a2SStefan Roese return ubi_open_volume_nm(dev, ++endptr, mode);
21909eefe2a2SStefan Roese
21919eefe2a2SStefan Roese return ERR_PTR(-EINVAL);
21929eefe2a2SStefan Roese }
21939eefe2a2SStefan Roese
alloc_ubifs_info(struct ubi_volume_desc * ubi)2194ff94bc40SHeiko Schocher static struct ubifs_info *alloc_ubifs_info(struct ubi_volume_desc *ubi)
21959eefe2a2SStefan Roese {
21969eefe2a2SStefan Roese struct ubifs_info *c;
21979eefe2a2SStefan Roese
21989eefe2a2SStefan Roese c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL);
2199ff94bc40SHeiko Schocher if (c) {
22009eefe2a2SStefan Roese spin_lock_init(&c->cnt_lock);
22019eefe2a2SStefan Roese spin_lock_init(&c->cs_lock);
22029eefe2a2SStefan Roese spin_lock_init(&c->buds_lock);
22039eefe2a2SStefan Roese spin_lock_init(&c->space_lock);
22049eefe2a2SStefan Roese spin_lock_init(&c->orphan_lock);
22059eefe2a2SStefan Roese init_rwsem(&c->commit_sem);
22069eefe2a2SStefan Roese mutex_init(&c->lp_mutex);
22079eefe2a2SStefan Roese mutex_init(&c->tnc_mutex);
22089eefe2a2SStefan Roese mutex_init(&c->log_mutex);
22099eefe2a2SStefan Roese mutex_init(&c->umount_mutex);
2210ff94bc40SHeiko Schocher mutex_init(&c->bu_mutex);
2211ff94bc40SHeiko Schocher mutex_init(&c->write_reserve_mutex);
22129eefe2a2SStefan Roese init_waitqueue_head(&c->cmt_wq);
22139eefe2a2SStefan Roese c->buds = RB_ROOT;
22149eefe2a2SStefan Roese c->old_idx = RB_ROOT;
22159eefe2a2SStefan Roese c->size_tree = RB_ROOT;
22169eefe2a2SStefan Roese c->orph_tree = RB_ROOT;
22179eefe2a2SStefan Roese INIT_LIST_HEAD(&c->infos_list);
22189eefe2a2SStefan Roese INIT_LIST_HEAD(&c->idx_gc);
22199eefe2a2SStefan Roese INIT_LIST_HEAD(&c->replay_list);
22209eefe2a2SStefan Roese INIT_LIST_HEAD(&c->replay_buds);
22219eefe2a2SStefan Roese INIT_LIST_HEAD(&c->uncat_list);
22229eefe2a2SStefan Roese INIT_LIST_HEAD(&c->empty_list);
22239eefe2a2SStefan Roese INIT_LIST_HEAD(&c->freeable_list);
22249eefe2a2SStefan Roese INIT_LIST_HEAD(&c->frdi_idx_list);
22259eefe2a2SStefan Roese INIT_LIST_HEAD(&c->unclean_leb_list);
22269eefe2a2SStefan Roese INIT_LIST_HEAD(&c->old_buds);
22279eefe2a2SStefan Roese INIT_LIST_HEAD(&c->orph_list);
22289eefe2a2SStefan Roese INIT_LIST_HEAD(&c->orph_new);
2229ff94bc40SHeiko Schocher c->no_chk_data_crc = 1;
22309eefe2a2SStefan Roese
22319eefe2a2SStefan Roese c->highest_inum = UBIFS_FIRST_INO;
22329eefe2a2SStefan Roese c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM;
22339eefe2a2SStefan Roese
22349eefe2a2SStefan Roese ubi_get_volume_info(ubi, &c->vi);
22359eefe2a2SStefan Roese ubi_get_device_info(c->vi.ubi_num, &c->di);
2236ff94bc40SHeiko Schocher }
2237ff94bc40SHeiko Schocher return c;
22389eefe2a2SStefan Roese }
22399eefe2a2SStefan Roese
ubifs_fill_super(struct super_block * sb,void * data,int silent)2240ff94bc40SHeiko Schocher static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
2241ff94bc40SHeiko Schocher {
2242ff94bc40SHeiko Schocher struct ubifs_info *c = sb->s_fs_info;
2243ff94bc40SHeiko Schocher struct inode *root;
2244ff94bc40SHeiko Schocher int err;
22459eefe2a2SStefan Roese
2246ff94bc40SHeiko Schocher c->vfs_sb = sb;
2247ddf7bcfaSHeiko Schocher #ifndef __UBOOT__
2248ff94bc40SHeiko Schocher /* Re-open the UBI device in read-write mode */
2249ff94bc40SHeiko Schocher c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE);
2250ddf7bcfaSHeiko Schocher #else
2251ddf7bcfaSHeiko Schocher /* U-Boot read only mode */
2252ddf7bcfaSHeiko Schocher c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READONLY);
2253ddf7bcfaSHeiko Schocher #endif
2254ddf7bcfaSHeiko Schocher
2255ff94bc40SHeiko Schocher if (IS_ERR(c->ubi)) {
2256ff94bc40SHeiko Schocher err = PTR_ERR(c->ubi);
2257ff94bc40SHeiko Schocher goto out;
2258ff94bc40SHeiko Schocher }
2259ff94bc40SHeiko Schocher
2260ff94bc40SHeiko Schocher #ifndef __UBOOT__
2261ff94bc40SHeiko Schocher /*
2262ff94bc40SHeiko Schocher * UBIFS provides 'backing_dev_info' in order to disable read-ahead. For
2263ff94bc40SHeiko Schocher * UBIFS, I/O is not deferred, it is done immediately in readpage,
2264ff94bc40SHeiko Schocher * which means the user would have to wait not just for their own I/O
2265ff94bc40SHeiko Schocher * but the read-ahead I/O as well i.e. completely pointless.
2266ff94bc40SHeiko Schocher *
2267ff94bc40SHeiko Schocher * Read-ahead will be disabled because @c->bdi.ra_pages is 0.
2268ff94bc40SHeiko Schocher */
22690195a7bbSHeiko Schocher c->bdi.name = "ubifs",
22700195a7bbSHeiko Schocher c->bdi.capabilities = 0;
2271ff94bc40SHeiko Schocher err = bdi_init(&c->bdi);
2272ff94bc40SHeiko Schocher if (err)
2273ff94bc40SHeiko Schocher goto out_close;
2274ff94bc40SHeiko Schocher err = bdi_register(&c->bdi, NULL, "ubifs_%d_%d",
2275ff94bc40SHeiko Schocher c->vi.ubi_num, c->vi.vol_id);
2276ff94bc40SHeiko Schocher if (err)
2277ff94bc40SHeiko Schocher goto out_bdi;
2278ff94bc40SHeiko Schocher
2279ff94bc40SHeiko Schocher err = ubifs_parse_options(c, data, 0);
2280ff94bc40SHeiko Schocher if (err)
2281ff94bc40SHeiko Schocher goto out_bdi;
2282ff94bc40SHeiko Schocher
2283ff94bc40SHeiko Schocher sb->s_bdi = &c->bdi;
2284ff94bc40SHeiko Schocher #endif
22859eefe2a2SStefan Roese sb->s_fs_info = c;
22869eefe2a2SStefan Roese sb->s_magic = UBIFS_SUPER_MAGIC;
22879eefe2a2SStefan Roese sb->s_blocksize = UBIFS_BLOCK_SIZE;
22889eefe2a2SStefan Roese sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT;
22899eefe2a2SStefan Roese sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c);
22909eefe2a2SStefan Roese if (c->max_inode_sz > MAX_LFS_FILESIZE)
22919eefe2a2SStefan Roese sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE;
2292ff94bc40SHeiko Schocher sb->s_op = &ubifs_super_operations;
22930195a7bbSHeiko Schocher #ifndef __UBOOT__
22940195a7bbSHeiko Schocher sb->s_xattr = ubifs_xattr_handlers;
22950195a7bbSHeiko Schocher #endif
2296febd7e41SArtem Bityutskiy
22979eefe2a2SStefan Roese mutex_lock(&c->umount_mutex);
22989eefe2a2SStefan Roese err = mount_ubifs(c);
22999eefe2a2SStefan Roese if (err) {
23009eefe2a2SStefan Roese ubifs_assert(err < 0);
23019eefe2a2SStefan Roese goto out_unlock;
23029eefe2a2SStefan Roese }
23039eefe2a2SStefan Roese
23049eefe2a2SStefan Roese /* Read the root inode */
23059eefe2a2SStefan Roese root = ubifs_iget(sb, UBIFS_ROOT_INO);
23069eefe2a2SStefan Roese if (IS_ERR(root)) {
23079eefe2a2SStefan Roese err = PTR_ERR(root);
23089eefe2a2SStefan Roese goto out_umount;
23099eefe2a2SStefan Roese }
23109eefe2a2SStefan Roese
2311ff94bc40SHeiko Schocher #ifndef __UBOOT__
2312ff94bc40SHeiko Schocher sb->s_root = d_make_root(root);
2313ff94bc40SHeiko Schocher if (!sb->s_root) {
2314ff94bc40SHeiko Schocher err = -ENOMEM;
2315ff94bc40SHeiko Schocher goto out_umount;
2316ff94bc40SHeiko Schocher }
2317ff94bc40SHeiko Schocher #else
23189eefe2a2SStefan Roese sb->s_root = NULL;
2319ff94bc40SHeiko Schocher #endif
23209eefe2a2SStefan Roese
23219eefe2a2SStefan Roese mutex_unlock(&c->umount_mutex);
23229eefe2a2SStefan Roese return 0;
23239eefe2a2SStefan Roese
23249eefe2a2SStefan Roese out_umount:
23259eefe2a2SStefan Roese ubifs_umount(c);
23269eefe2a2SStefan Roese out_unlock:
23279eefe2a2SStefan Roese mutex_unlock(&c->umount_mutex);
2328ff94bc40SHeiko Schocher #ifndef __UBOOT__
2329ff94bc40SHeiko Schocher out_bdi:
2330ff94bc40SHeiko Schocher bdi_destroy(&c->bdi);
2331ff94bc40SHeiko Schocher out_close:
2332ff94bc40SHeiko Schocher #endif
23339eefe2a2SStefan Roese ubi_close_volume(c->ubi);
2334ff94bc40SHeiko Schocher out:
23359eefe2a2SStefan Roese return err;
23369eefe2a2SStefan Roese }
23379eefe2a2SStefan Roese
sb_test(struct super_block * sb,void * data)23389eefe2a2SStefan Roese static int sb_test(struct super_block *sb, void *data)
23399eefe2a2SStefan Roese {
2340ff94bc40SHeiko Schocher struct ubifs_info *c1 = data;
2341ff94bc40SHeiko Schocher struct ubifs_info *c = sb->s_fs_info;
23429eefe2a2SStefan Roese
2343ff94bc40SHeiko Schocher return c->vi.cdev == c1->vi.cdev;
23449eefe2a2SStefan Roese }
23459eefe2a2SStefan Roese
sb_set(struct super_block * sb,void * data)2346ff94bc40SHeiko Schocher static int sb_set(struct super_block *sb, void *data)
2347ff94bc40SHeiko Schocher {
2348ff94bc40SHeiko Schocher sb->s_fs_info = data;
2349ff94bc40SHeiko Schocher return set_anon_super(sb, NULL);
2350ff94bc40SHeiko Schocher }
2351ff94bc40SHeiko Schocher
alloc_super(struct file_system_type * type,int flags)2352ff94bc40SHeiko Schocher static struct super_block *alloc_super(struct file_system_type *type, int flags)
2353ff94bc40SHeiko Schocher {
2354ff94bc40SHeiko Schocher struct super_block *s;
2355ff94bc40SHeiko Schocher int err;
2356ff94bc40SHeiko Schocher
2357ff94bc40SHeiko Schocher s = kzalloc(sizeof(struct super_block), GFP_USER);
2358ff94bc40SHeiko Schocher if (!s) {
2359ff94bc40SHeiko Schocher err = -ENOMEM;
2360ff94bc40SHeiko Schocher return ERR_PTR(err);
2361ff94bc40SHeiko Schocher }
2362ff94bc40SHeiko Schocher
23635a08cfeeSChristophe Kerello #ifndef __UBOOT__
2364ff94bc40SHeiko Schocher INIT_HLIST_NODE(&s->s_instances);
23655a08cfeeSChristophe Kerello #endif
2366ff94bc40SHeiko Schocher INIT_LIST_HEAD(&s->s_inodes);
2367ff94bc40SHeiko Schocher s->s_time_gran = 1000000000;
2368ff94bc40SHeiko Schocher s->s_flags = flags;
2369ff94bc40SHeiko Schocher
2370ff94bc40SHeiko Schocher return s;
2371ff94bc40SHeiko Schocher }
2372ff94bc40SHeiko Schocher
2373ff94bc40SHeiko Schocher /**
2374ff94bc40SHeiko Schocher * sget - find or create a superblock
2375ff94bc40SHeiko Schocher * @type: filesystem type superblock should belong to
2376ff94bc40SHeiko Schocher * @test: comparison callback
2377ff94bc40SHeiko Schocher * @set: setup callback
2378ff94bc40SHeiko Schocher * @flags: mount flags
2379ff94bc40SHeiko Schocher * @data: argument to each of them
2380ff94bc40SHeiko Schocher */
sget(struct file_system_type * type,int (* test)(struct super_block *,void *),int (* set)(struct super_block *,void *),int flags,void * data)2381ff94bc40SHeiko Schocher struct super_block *sget(struct file_system_type *type,
2382ff94bc40SHeiko Schocher int (*test)(struct super_block *,void *),
2383ff94bc40SHeiko Schocher int (*set)(struct super_block *,void *),
2384ff94bc40SHeiko Schocher int flags,
2385ff94bc40SHeiko Schocher void *data)
2386ff94bc40SHeiko Schocher {
2387ff94bc40SHeiko Schocher struct super_block *s = NULL;
2388ff94bc40SHeiko Schocher #ifndef __UBOOT__
2389ff94bc40SHeiko Schocher struct super_block *old;
2390ff94bc40SHeiko Schocher #endif
2391ff94bc40SHeiko Schocher int err;
2392ff94bc40SHeiko Schocher
2393ff94bc40SHeiko Schocher #ifndef __UBOOT__
2394ff94bc40SHeiko Schocher retry:
2395ff94bc40SHeiko Schocher spin_lock(&sb_lock);
2396ff94bc40SHeiko Schocher if (test) {
2397ff94bc40SHeiko Schocher hlist_for_each_entry(old, &type->fs_supers, s_instances) {
2398ff94bc40SHeiko Schocher if (!test(old, data))
2399ff94bc40SHeiko Schocher continue;
2400ff94bc40SHeiko Schocher if (!grab_super(old))
2401ff94bc40SHeiko Schocher goto retry;
2402ff94bc40SHeiko Schocher if (s) {
2403ff94bc40SHeiko Schocher up_write(&s->s_umount);
2404ff94bc40SHeiko Schocher destroy_super(s);
2405ff94bc40SHeiko Schocher s = NULL;
2406ff94bc40SHeiko Schocher }
2407ff94bc40SHeiko Schocher return old;
2408ff94bc40SHeiko Schocher }
2409ff94bc40SHeiko Schocher }
2410ff94bc40SHeiko Schocher #endif
2411ff94bc40SHeiko Schocher if (!s) {
2412ff94bc40SHeiko Schocher spin_unlock(&sb_lock);
2413ff94bc40SHeiko Schocher s = alloc_super(type, flags);
2414ff94bc40SHeiko Schocher if (!s)
2415ff94bc40SHeiko Schocher return ERR_PTR(-ENOMEM);
2416ff94bc40SHeiko Schocher #ifndef __UBOOT__
2417ff94bc40SHeiko Schocher goto retry;
2418ff94bc40SHeiko Schocher #endif
2419ff94bc40SHeiko Schocher }
2420ff94bc40SHeiko Schocher
2421ff94bc40SHeiko Schocher err = set(s, data);
2422ff94bc40SHeiko Schocher if (err) {
2423ff94bc40SHeiko Schocher #ifndef __UBOOT__
2424ff94bc40SHeiko Schocher spin_unlock(&sb_lock);
2425ff94bc40SHeiko Schocher up_write(&s->s_umount);
2426ff94bc40SHeiko Schocher destroy_super(s);
2427ff94bc40SHeiko Schocher #endif
2428ff94bc40SHeiko Schocher return ERR_PTR(err);
2429ff94bc40SHeiko Schocher }
2430ff94bc40SHeiko Schocher s->s_type = type;
2431ff94bc40SHeiko Schocher #ifndef __UBOOT__
2432ff94bc40SHeiko Schocher strlcpy(s->s_id, type->name, sizeof(s->s_id));
2433b1d6590dSHeiko Schocher list_add_tail(&s->s_list, &super_blocks);
2434ff94bc40SHeiko Schocher hlist_add_head(&s->s_instances, &type->fs_supers);
2435ff94bc40SHeiko Schocher spin_unlock(&sb_lock);
2436ff94bc40SHeiko Schocher get_filesystem(type);
2437ff94bc40SHeiko Schocher register_shrinker(&s->s_shrink);
24385a08cfeeSChristophe Kerello #else
24395a08cfeeSChristophe Kerello strncpy(s->s_id, type->name, sizeof(s->s_id));
2440ff94bc40SHeiko Schocher #endif
2441ff94bc40SHeiko Schocher return s;
2442ff94bc40SHeiko Schocher }
2443ff94bc40SHeiko Schocher
2444ff94bc40SHeiko Schocher EXPORT_SYMBOL(sget);
2445ff94bc40SHeiko Schocher
2446ff94bc40SHeiko Schocher
ubifs_mount(struct file_system_type * fs_type,int flags,const char * name,void * data)2447ff94bc40SHeiko Schocher static struct dentry *ubifs_mount(struct file_system_type *fs_type, int flags,
2448ff94bc40SHeiko Schocher const char *name, void *data)
24499eefe2a2SStefan Roese {
24509eefe2a2SStefan Roese struct ubi_volume_desc *ubi;
2451ff94bc40SHeiko Schocher struct ubifs_info *c;
24529eefe2a2SStefan Roese struct super_block *sb;
24539eefe2a2SStefan Roese int err;
24549eefe2a2SStefan Roese
24559eefe2a2SStefan Roese dbg_gen("name %s, flags %#x", name, flags);
24569eefe2a2SStefan Roese
24579eefe2a2SStefan Roese /*
24589eefe2a2SStefan Roese * Get UBI device number and volume ID. Mount it read-only so far
24599eefe2a2SStefan Roese * because this might be a new mount point, and UBI allows only one
24609eefe2a2SStefan Roese * read-write user at a time.
24619eefe2a2SStefan Roese */
24629eefe2a2SStefan Roese ubi = open_ubi(name, UBI_READONLY);
24639eefe2a2SStefan Roese if (IS_ERR(ubi)) {
2464*7236e24bSStefan Roese pr_err("UBIFS error (pid: %d): cannot open \"%s\", error %d\n",
24650195a7bbSHeiko Schocher current->pid, name, (int)PTR_ERR(ubi));
2466ff94bc40SHeiko Schocher return ERR_CAST(ubi);
24679eefe2a2SStefan Roese }
24689eefe2a2SStefan Roese
2469ff94bc40SHeiko Schocher c = alloc_ubifs_info(ubi);
2470ff94bc40SHeiko Schocher if (!c) {
2471ff94bc40SHeiko Schocher err = -ENOMEM;
2472ff94bc40SHeiko Schocher goto out_close;
2473ff94bc40SHeiko Schocher }
24749eefe2a2SStefan Roese
2475ff94bc40SHeiko Schocher dbg_gen("opened ubi%d_%d", c->vi.ubi_num, c->vi.vol_id);
2476ff94bc40SHeiko Schocher
2477ff94bc40SHeiko Schocher sb = sget(fs_type, sb_test, sb_set, flags, c);
24789eefe2a2SStefan Roese if (IS_ERR(sb)) {
24799eefe2a2SStefan Roese err = PTR_ERR(sb);
2480ff94bc40SHeiko Schocher kfree(c);
24819eefe2a2SStefan Roese goto out_close;
24829eefe2a2SStefan Roese }
24839eefe2a2SStefan Roese
24849eefe2a2SStefan Roese if (sb->s_root) {
2485ff94bc40SHeiko Schocher struct ubifs_info *c1 = sb->s_fs_info;
2486ff94bc40SHeiko Schocher kfree(c);
24879eefe2a2SStefan Roese /* A new mount point for already mounted UBIFS */
24889eefe2a2SStefan Roese dbg_gen("this ubi volume is already mounted");
2489ff94bc40SHeiko Schocher if (!!(flags & MS_RDONLY) != c1->ro_mount) {
24909eefe2a2SStefan Roese err = -EBUSY;
24919eefe2a2SStefan Roese goto out_deact;
24929eefe2a2SStefan Roese }
24939eefe2a2SStefan Roese } else {
24949eefe2a2SStefan Roese err = ubifs_fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
24959eefe2a2SStefan Roese if (err)
24969eefe2a2SStefan Roese goto out_deact;
24979eefe2a2SStefan Roese /* We do not support atime */
24989eefe2a2SStefan Roese sb->s_flags |= MS_ACTIVE | MS_NOATIME;
24999eefe2a2SStefan Roese }
25009eefe2a2SStefan Roese
25019eefe2a2SStefan Roese /* 'fill_super()' opens ubi again so we must close it here */
25029eefe2a2SStefan Roese ubi_close_volume(ubi);
25039eefe2a2SStefan Roese
2504ff94bc40SHeiko Schocher #ifdef __UBOOT__
25059eefe2a2SStefan Roese ubifs_sb = sb;
25069eefe2a2SStefan Roese return 0;
2507ff94bc40SHeiko Schocher #else
2508ff94bc40SHeiko Schocher return dget(sb->s_root);
2509ff94bc40SHeiko Schocher #endif
25109eefe2a2SStefan Roese
25119eefe2a2SStefan Roese out_deact:
2512ff94bc40SHeiko Schocher #ifndef __UBOOT__
2513ff94bc40SHeiko Schocher deactivate_locked_super(sb);
2514ff94bc40SHeiko Schocher #endif
25159eefe2a2SStefan Roese out_close:
25169eefe2a2SStefan Roese ubi_close_volume(ubi);
2517ff94bc40SHeiko Schocher return ERR_PTR(err);
25189eefe2a2SStefan Roese }
25199eefe2a2SStefan Roese
kill_ubifs_super(struct super_block * s)2520ff94bc40SHeiko Schocher static void kill_ubifs_super(struct super_block *s)
2521ff94bc40SHeiko Schocher {
2522ff94bc40SHeiko Schocher struct ubifs_info *c = s->s_fs_info;
2523ff94bc40SHeiko Schocher #ifndef __UBOOT__
2524ff94bc40SHeiko Schocher kill_anon_super(s);
2525ff94bc40SHeiko Schocher #endif
2526ff94bc40SHeiko Schocher kfree(c);
2527ff94bc40SHeiko Schocher }
2528ff94bc40SHeiko Schocher
2529ff94bc40SHeiko Schocher static struct file_system_type ubifs_fs_type = {
2530ff94bc40SHeiko Schocher .name = "ubifs",
2531ff94bc40SHeiko Schocher .owner = THIS_MODULE,
2532ff94bc40SHeiko Schocher .mount = ubifs_mount,
2533ff94bc40SHeiko Schocher .kill_sb = kill_ubifs_super,
2534ff94bc40SHeiko Schocher };
2535ff94bc40SHeiko Schocher #ifndef __UBOOT__
2536ff94bc40SHeiko Schocher MODULE_ALIAS_FS("ubifs");
2537ff94bc40SHeiko Schocher
2538ff94bc40SHeiko Schocher /*
2539ff94bc40SHeiko Schocher * Inode slab cache constructor.
2540ff94bc40SHeiko Schocher */
inode_slab_ctor(void * obj)2541ff94bc40SHeiko Schocher static void inode_slab_ctor(void *obj)
2542ff94bc40SHeiko Schocher {
2543ff94bc40SHeiko Schocher struct ubifs_inode *ui = obj;
2544ff94bc40SHeiko Schocher inode_init_once(&ui->vfs_inode);
2545ff94bc40SHeiko Schocher }
2546ff94bc40SHeiko Schocher
ubifs_init(void)2547ff94bc40SHeiko Schocher static int __init ubifs_init(void)
2548ff94bc40SHeiko Schocher #else
2549ff94bc40SHeiko Schocher int ubifs_init(void)
2550ff94bc40SHeiko Schocher #endif
25519eefe2a2SStefan Roese {
25529eefe2a2SStefan Roese int err;
25539eefe2a2SStefan Roese
25549eefe2a2SStefan Roese BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24);
25559eefe2a2SStefan Roese
25569eefe2a2SStefan Roese /* Make sure node sizes are 8-byte aligned */
25579eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_CH_SZ & 7);
25589eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7);
25599eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7);
25609eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7);
25619eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7);
25629eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7);
25639eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7);
25649eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7);
25659eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7);
25669eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7);
25679eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7);
25689eefe2a2SStefan Roese
25699eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7);
25709eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7);
25719eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7);
25729eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7);
25739eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7);
25749eefe2a2SStefan Roese BUILD_BUG_ON(MIN_WRITE_SZ & 7);
25759eefe2a2SStefan Roese
25769eefe2a2SStefan Roese /* Check min. node size */
25779eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ);
25789eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ);
25799eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ);
25809eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ);
25819eefe2a2SStefan Roese
25829eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
25839eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
25849eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ);
25859eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ);
25869eefe2a2SStefan Roese
25879eefe2a2SStefan Roese /* Defined node sizes */
25889eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096);
25899eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512);
25909eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160);
25919eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64);
25929eefe2a2SStefan Roese
25939eefe2a2SStefan Roese /*
25949eefe2a2SStefan Roese * We use 2 bit wide bit-fields to store compression type, which should
25959eefe2a2SStefan Roese * be amended if more compressors are added. The bit-fields are:
25969eefe2a2SStefan Roese * @compr_type in 'struct ubifs_inode', @default_compr in
25979eefe2a2SStefan Roese * 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'.
25989eefe2a2SStefan Roese */
25999eefe2a2SStefan Roese BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4);
26009eefe2a2SStefan Roese
26019eefe2a2SStefan Roese /*
26029eefe2a2SStefan Roese * We require that PAGE_CACHE_SIZE is greater-than-or-equal-to
26039eefe2a2SStefan Roese * UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2.
26049eefe2a2SStefan Roese */
26059eefe2a2SStefan Roese if (PAGE_CACHE_SIZE < UBIFS_BLOCK_SIZE) {
2606*7236e24bSStefan Roese pr_err("UBIFS error (pid %d): VFS page cache size is %u bytes, but UBIFS requires at least 4096 bytes\n",
26070195a7bbSHeiko Schocher current->pid, (unsigned int)PAGE_CACHE_SIZE);
26089eefe2a2SStefan Roese return -EINVAL;
26099eefe2a2SStefan Roese }
26109eefe2a2SStefan Roese
2611ff94bc40SHeiko Schocher #ifndef __UBOOT__
2612ff94bc40SHeiko Schocher ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab",
2613ff94bc40SHeiko Schocher sizeof(struct ubifs_inode), 0,
2614ff94bc40SHeiko Schocher SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT,
2615ff94bc40SHeiko Schocher &inode_slab_ctor);
2616ff94bc40SHeiko Schocher if (!ubifs_inode_slab)
2617ff94bc40SHeiko Schocher return -ENOMEM;
2618ff94bc40SHeiko Schocher
26190195a7bbSHeiko Schocher err = register_shrinker(&ubifs_shrinker_info);
26200195a7bbSHeiko Schocher if (err)
26210195a7bbSHeiko Schocher goto out_slab;
2622ff94bc40SHeiko Schocher #endif
26239eefe2a2SStefan Roese
26249eefe2a2SStefan Roese err = ubifs_compressors_init();
26259eefe2a2SStefan Roese if (err)
26269eefe2a2SStefan Roese goto out_shrinker;
26279eefe2a2SStefan Roese
2628ff94bc40SHeiko Schocher #ifndef __UBOOT__
2629ff94bc40SHeiko Schocher err = dbg_debugfs_init();
2630ff94bc40SHeiko Schocher if (err)
2631ff94bc40SHeiko Schocher goto out_compr;
2632ff94bc40SHeiko Schocher
2633ff94bc40SHeiko Schocher err = register_filesystem(&ubifs_fs_type);
2634ff94bc40SHeiko Schocher if (err) {
2635*7236e24bSStefan Roese pr_err("UBIFS error (pid %d): cannot register file system, error %d\n",
26360195a7bbSHeiko Schocher current->pid, err);
2637ff94bc40SHeiko Schocher goto out_dbg;
2638ff94bc40SHeiko Schocher }
2639ff94bc40SHeiko Schocher #endif
26409eefe2a2SStefan Roese return 0;
26419eefe2a2SStefan Roese
2642ff94bc40SHeiko Schocher #ifndef __UBOOT__
2643ff94bc40SHeiko Schocher out_dbg:
2644ff94bc40SHeiko Schocher dbg_debugfs_exit();
2645ff94bc40SHeiko Schocher out_compr:
2646ff94bc40SHeiko Schocher ubifs_compressors_exit();
2647ff94bc40SHeiko Schocher #endif
26489eefe2a2SStefan Roese out_shrinker:
2649ff94bc40SHeiko Schocher #ifndef __UBOOT__
2650ff94bc40SHeiko Schocher unregister_shrinker(&ubifs_shrinker_info);
26510195a7bbSHeiko Schocher out_slab:
2652ff94bc40SHeiko Schocher #endif
2653ff94bc40SHeiko Schocher kmem_cache_destroy(ubifs_inode_slab);
26549eefe2a2SStefan Roese return err;
26559eefe2a2SStefan Roese }
2656ff94bc40SHeiko Schocher /* late_initcall to let compressors initialize first */
2657ff94bc40SHeiko Schocher late_initcall(ubifs_init);
2658ff94bc40SHeiko Schocher
2659ff94bc40SHeiko Schocher #ifndef __UBOOT__
ubifs_exit(void)2660ff94bc40SHeiko Schocher static void __exit ubifs_exit(void)
2661ff94bc40SHeiko Schocher {
2662ff94bc40SHeiko Schocher ubifs_assert(list_empty(&ubifs_infos));
2663ff94bc40SHeiko Schocher ubifs_assert(atomic_long_read(&ubifs_clean_zn_cnt) == 0);
2664ff94bc40SHeiko Schocher
2665ff94bc40SHeiko Schocher dbg_debugfs_exit();
2666ff94bc40SHeiko Schocher ubifs_compressors_exit();
2667ff94bc40SHeiko Schocher unregister_shrinker(&ubifs_shrinker_info);
26689eefe2a2SStefan Roese
26699eefe2a2SStefan Roese /*
2670ff94bc40SHeiko Schocher * Make sure all delayed rcu free inodes are flushed before we
2671ff94bc40SHeiko Schocher * destroy cache.
26729eefe2a2SStefan Roese */
2673ff94bc40SHeiko Schocher rcu_barrier();
2674ff94bc40SHeiko Schocher kmem_cache_destroy(ubifs_inode_slab);
2675ff94bc40SHeiko Schocher unregister_filesystem(&ubifs_fs_type);
2676ff94bc40SHeiko Schocher }
2677ff94bc40SHeiko Schocher module_exit(ubifs_exit);
26789eefe2a2SStefan Roese
2679ff94bc40SHeiko Schocher MODULE_LICENSE("GPL");
2680ff94bc40SHeiko Schocher MODULE_VERSION(__stringify(UBIFS_VERSION));
2681ff94bc40SHeiko Schocher MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter");
2682ff94bc40SHeiko Schocher MODULE_DESCRIPTION("UBIFS - UBI File System");
2683ff94bc40SHeiko Schocher #else
uboot_ubifs_mount(char * vol_name)2684ff94bc40SHeiko Schocher int uboot_ubifs_mount(char *vol_name)
26859eefe2a2SStefan Roese {
2686ff94bc40SHeiko Schocher struct dentry *ret;
26879eefe2a2SStefan Roese int flags;
26889eefe2a2SStefan Roese
26899eefe2a2SStefan Roese /*
26909eefe2a2SStefan Roese * First unmount if allready mounted
26919eefe2a2SStefan Roese */
26929eefe2a2SStefan Roese if (ubifs_sb)
26939eefe2a2SStefan Roese ubifs_umount(ubifs_sb->s_fs_info);
26949eefe2a2SStefan Roese
26959eefe2a2SStefan Roese /*
26969eefe2a2SStefan Roese * Mount in read-only mode
26979eefe2a2SStefan Roese */
26989eefe2a2SStefan Roese flags = MS_RDONLY;
2699ff94bc40SHeiko Schocher ret = ubifs_mount(&ubifs_fs_type, flags, vol_name, NULL);
2700ff94bc40SHeiko Schocher if (IS_ERR(ret)) {
2701ff94bc40SHeiko Schocher printf("Error reading superblock on volume '%s' " \
2702ff94bc40SHeiko Schocher "errno=%d!\n", vol_name, (int)PTR_ERR(ret));
27039eefe2a2SStefan Roese return -1;
27049eefe2a2SStefan Roese }
27059eefe2a2SStefan Roese
27069eefe2a2SStefan Roese return 0;
27079eefe2a2SStefan Roese }
2708ff94bc40SHeiko Schocher #endif
2709