1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0
21da177e4SLinus Torvalds
31da177e4SLinus Torvalds /*
41da177e4SLinus Torvalds * Directory operations for Coda filesystem
51da177e4SLinus Torvalds * Original version: (C) 1996 P. Braam and M. Callahan
61da177e4SLinus Torvalds * Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University
71da177e4SLinus Torvalds *
81da177e4SLinus Torvalds * Carnegie Mellon encourages users to contribute improvements to
91da177e4SLinus Torvalds * the Coda project. Contact Peter Braam (coda@cs.cmu.edu).
101da177e4SLinus Torvalds */
111da177e4SLinus Torvalds
121da177e4SLinus Torvalds #include <linux/types.h>
131da177e4SLinus Torvalds #include <linux/kernel.h>
141da177e4SLinus Torvalds #include <linux/time.h>
151da177e4SLinus Torvalds #include <linux/fs.h>
165a0e3ad6STejun Heo #include <linux/slab.h>
171da177e4SLinus Torvalds #include <linux/file.h>
181da177e4SLinus Torvalds #include <linux/stat.h>
191da177e4SLinus Torvalds #include <linux/errno.h>
201da177e4SLinus Torvalds #include <linux/string.h>
21b5ce1d83SYoshihisa Abe #include <linux/spinlock.h>
2234286d66SNick Piggin #include <linux/namei.h>
23834b46c3SFabian Frederick #include <linux/uaccess.h>
241da177e4SLinus Torvalds
251da177e4SLinus Torvalds #include <linux/coda.h>
268fc8b9dfSDavid Howells #include "coda_psdev.h"
2731a203dfSAl Viro #include "coda_linux.h"
2831a203dfSAl Viro #include "coda_cache.h"
291da177e4SLinus Torvalds
30c98d8cfbSAdrian Bunk #include "coda_int.h"
31c98d8cfbSAdrian Bunk
321da177e4SLinus Torvalds /* same as fs/bad_inode.c */
coda_return_EIO(void)331da177e4SLinus Torvalds static int coda_return_EIO(void)
341da177e4SLinus Torvalds {
351da177e4SLinus Torvalds return -EIO;
361da177e4SLinus Torvalds }
371da177e4SLinus Torvalds #define CODA_EIO_ERROR ((void *) (coda_return_EIO))
381da177e4SLinus Torvalds
391da177e4SLinus Torvalds /* inode operations for directories */
401da177e4SLinus Torvalds /* access routines: lookup, readlink, permission */
coda_lookup(struct inode * dir,struct dentry * entry,unsigned int flags)4100cd8dd3SAl Viro static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, unsigned int flags)
421da177e4SLinus Torvalds {
43f4947fbcSAl Viro struct super_block *sb = dir->i_sb;
441da177e4SLinus Torvalds const char *name = entry->d_name.name;
451da177e4SLinus Torvalds size_t length = entry->d_name.len;
46f4947fbcSAl Viro struct inode *inode;
47f4947fbcSAl Viro int type = 0;
481da177e4SLinus Torvalds
491da177e4SLinus Torvalds if (length > CODA_MAXNAMLEN) {
509a05671dSJan Harkes pr_err("name too long: lookup, %s %zu\n",
519a05671dSJan Harkes coda_i2s(dir), length);
521da177e4SLinus Torvalds return ERR_PTR(-ENAMETOOLONG);
531da177e4SLinus Torvalds }
541da177e4SLinus Torvalds
551da177e4SLinus Torvalds /* control object, create inode on the fly */
56a7400222SAl Viro if (is_root_inode(dir) && coda_iscontrol(name, length)) {
57f4947fbcSAl Viro inode = coda_cnode_makectl(sb);
58ed36f723SJan Harkes type = CODA_NOCACHE;
59f4947fbcSAl Viro } else {
60f4947fbcSAl Viro struct CodaFid fid = { { 0, } };
61f4947fbcSAl Viro int error = venus_lookup(sb, coda_i2f(dir), name, length,
62f4947fbcSAl Viro &type, &fid);
63f4947fbcSAl Viro inode = !error ? coda_cnode_make(&fid, sb) : ERR_PTR(error);
641da177e4SLinus Torvalds }
651da177e4SLinus Torvalds
66f4947fbcSAl Viro if (!IS_ERR(inode) && (type & CODA_NOCACHE))
67ed36f723SJan Harkes coda_flag_inode(inode, C_VATTR | C_PURGE);
68ed36f723SJan Harkes
69f4947fbcSAl Viro if (inode == ERR_PTR(-ENOENT))
70f4947fbcSAl Viro inode = NULL;
71f4947fbcSAl Viro
72ed36f723SJan Harkes return d_splice_alias(inode, entry);
731da177e4SLinus Torvalds }
741da177e4SLinus Torvalds
751da177e4SLinus Torvalds
coda_permission(struct mnt_idmap * idmap,struct inode * inode,int mask)764609e1f1SChristian Brauner int coda_permission(struct mnt_idmap *idmap, struct inode *inode,
77549c7297SChristian Brauner int mask)
781da177e4SLinus Torvalds {
79f7cc02b8SYoshihisa Abe int error;
801da177e4SLinus Torvalds
8110556cb2SAl Viro if (mask & MAY_NOT_BLOCK)
82b74c79e9SNick Piggin return -ECHILD;
83b74c79e9SNick Piggin
84e6305c43SAl Viro mask &= MAY_READ | MAY_WRITE | MAY_EXEC;
85e6305c43SAl Viro
861da177e4SLinus Torvalds if (!mask)
871da177e4SLinus Torvalds return 0;
881da177e4SLinus Torvalds
89f696a365SMiklos Szeredi if ((mask & MAY_EXEC) && !execute_ok(inode))
90f696a365SMiklos Szeredi return -EACCES;
91f696a365SMiklos Szeredi
921da177e4SLinus Torvalds if (coda_cache_check(inode, mask))
93f7cc02b8SYoshihisa Abe return 0;
941da177e4SLinus Torvalds
951da177e4SLinus Torvalds error = venus_access(inode->i_sb, coda_i2f(inode), mask);
961da177e4SLinus Torvalds
971da177e4SLinus Torvalds if (!error)
981da177e4SLinus Torvalds coda_cache_enter(inode, mask);
991da177e4SLinus Torvalds
1001da177e4SLinus Torvalds return error;
1011da177e4SLinus Torvalds }
1021da177e4SLinus Torvalds
1031da177e4SLinus Torvalds
coda_dir_update_mtime(struct inode * dir)104d728900cSJan Harkes static inline void coda_dir_update_mtime(struct inode *dir)
1051da177e4SLinus Torvalds {
1061da177e4SLinus Torvalds #ifdef REQUERY_VENUS_FOR_MTIME
1071da177e4SLinus Torvalds /* invalidate the directory cnode's attributes so we refetch the
1081da177e4SLinus Torvalds * attributes from venus next time the inode is referenced */
1091da177e4SLinus Torvalds coda_flag_inode(dir, C_VATTR);
1101da177e4SLinus Torvalds #else
1111da177e4SLinus Torvalds /* optimistically we can also act as if our nose bleeds. The
1121da177e4SLinus Torvalds * granularity of the mtime is coarse anyways so we might actually be
1131da177e4SLinus Torvalds * right most of the time. Note: we only do this for directories. */
11402027d42SDeepa Dinamani dir->i_mtime = inode_set_ctime_current(dir);
1151da177e4SLinus Torvalds #endif
116d728900cSJan Harkes }
117d728900cSJan Harkes
118d728900cSJan Harkes /* we have to wrap inc_nlink/drop_nlink because sometimes userspace uses a
119d728900cSJan Harkes * trick to fool GNU find's optimizations. If we can't be sure of the link
120d728900cSJan Harkes * (because of volume mount points) we set i_nlink to 1 which forces find
121d728900cSJan Harkes * to consider every child as a possible directory. We should also never
122d728900cSJan Harkes * see an increment or decrement for deleted directories where i_nlink == 0 */
coda_dir_inc_nlink(struct inode * dir)123d728900cSJan Harkes static inline void coda_dir_inc_nlink(struct inode *dir)
124d728900cSJan Harkes {
125d728900cSJan Harkes if (dir->i_nlink >= 2)
126d728900cSJan Harkes inc_nlink(dir);
127d728900cSJan Harkes }
128d728900cSJan Harkes
coda_dir_drop_nlink(struct inode * dir)129d728900cSJan Harkes static inline void coda_dir_drop_nlink(struct inode *dir)
130d728900cSJan Harkes {
131d728900cSJan Harkes if (dir->i_nlink > 2)
132d728900cSJan Harkes drop_nlink(dir);
1331da177e4SLinus Torvalds }
1341da177e4SLinus Torvalds
1351da177e4SLinus Torvalds /* creation routines: create, mknod, mkdir, link, symlink */
coda_create(struct mnt_idmap * idmap,struct inode * dir,struct dentry * de,umode_t mode,bool excl)1366c960e68SChristian Brauner static int coda_create(struct mnt_idmap *idmap, struct inode *dir,
137549c7297SChristian Brauner struct dentry *de, umode_t mode, bool excl)
1381da177e4SLinus Torvalds {
139f7cc02b8SYoshihisa Abe int error;
1401da177e4SLinus Torvalds const char *name=de->d_name.name;
1411da177e4SLinus Torvalds int length=de->d_name.len;
1421da177e4SLinus Torvalds struct inode *inode;
1431da177e4SLinus Torvalds struct CodaFid newfid;
1441da177e4SLinus Torvalds struct coda_vattr attrs;
1451da177e4SLinus Torvalds
146a7400222SAl Viro if (is_root_inode(dir) && coda_iscontrol(name, length))
1471da177e4SLinus Torvalds return -EPERM;
1481da177e4SLinus Torvalds
1491da177e4SLinus Torvalds error = venus_create(dir->i_sb, coda_i2f(dir), name, length,
1501da177e4SLinus Torvalds 0, mode, &newfid, &attrs);
151f7cc02b8SYoshihisa Abe if (error)
152f7cc02b8SYoshihisa Abe goto err_out;
1531da177e4SLinus Torvalds
1541da177e4SLinus Torvalds inode = coda_iget(dir->i_sb, &newfid, &attrs);
1551da177e4SLinus Torvalds if (IS_ERR(inode)) {
156f7cc02b8SYoshihisa Abe error = PTR_ERR(inode);
157f7cc02b8SYoshihisa Abe goto err_out;
1581da177e4SLinus Torvalds }
1591da177e4SLinus Torvalds
1601da177e4SLinus Torvalds /* invalidate the directory cnode's attributes */
161d728900cSJan Harkes coda_dir_update_mtime(dir);
1621da177e4SLinus Torvalds d_instantiate(de, inode);
1631da177e4SLinus Torvalds return 0;
164f7cc02b8SYoshihisa Abe err_out:
165f7cc02b8SYoshihisa Abe d_drop(de);
166f7cc02b8SYoshihisa Abe return error;
1671da177e4SLinus Torvalds }
1681da177e4SLinus Torvalds
coda_mkdir(struct mnt_idmap * idmap,struct inode * dir,struct dentry * de,umode_t mode)169c54bd91eSChristian Brauner static int coda_mkdir(struct mnt_idmap *idmap, struct inode *dir,
170549c7297SChristian Brauner struct dentry *de, umode_t mode)
1711da177e4SLinus Torvalds {
1721da177e4SLinus Torvalds struct inode *inode;
1731da177e4SLinus Torvalds struct coda_vattr attrs;
1741da177e4SLinus Torvalds const char *name = de->d_name.name;
1751da177e4SLinus Torvalds int len = de->d_name.len;
1761da177e4SLinus Torvalds int error;
1771da177e4SLinus Torvalds struct CodaFid newfid;
1781da177e4SLinus Torvalds
179a7400222SAl Viro if (is_root_inode(dir) && coda_iscontrol(name, len))
1801da177e4SLinus Torvalds return -EPERM;
1811da177e4SLinus Torvalds
1821da177e4SLinus Torvalds attrs.va_mode = mode;
1831da177e4SLinus Torvalds error = venus_mkdir(dir->i_sb, coda_i2f(dir),
1841da177e4SLinus Torvalds name, len, &newfid, &attrs);
185f7cc02b8SYoshihisa Abe if (error)
186f7cc02b8SYoshihisa Abe goto err_out;
1871da177e4SLinus Torvalds
1881da177e4SLinus Torvalds inode = coda_iget(dir->i_sb, &newfid, &attrs);
1891da177e4SLinus Torvalds if (IS_ERR(inode)) {
190f7cc02b8SYoshihisa Abe error = PTR_ERR(inode);
191f7cc02b8SYoshihisa Abe goto err_out;
1921da177e4SLinus Torvalds }
1931da177e4SLinus Torvalds
1941da177e4SLinus Torvalds /* invalidate the directory cnode's attributes */
195d728900cSJan Harkes coda_dir_inc_nlink(dir);
196d728900cSJan Harkes coda_dir_update_mtime(dir);
1971da177e4SLinus Torvalds d_instantiate(de, inode);
1981da177e4SLinus Torvalds return 0;
199f7cc02b8SYoshihisa Abe err_out:
200f7cc02b8SYoshihisa Abe d_drop(de);
201f7cc02b8SYoshihisa Abe return error;
2021da177e4SLinus Torvalds }
2031da177e4SLinus Torvalds
2041da177e4SLinus Torvalds /* try to make de an entry in dir_inodde linked to source_de */
coda_link(struct dentry * source_de,struct inode * dir_inode,struct dentry * de)2051da177e4SLinus Torvalds static int coda_link(struct dentry *source_de, struct inode *dir_inode,
2061da177e4SLinus Torvalds struct dentry *de)
2071da177e4SLinus Torvalds {
2082b0143b5SDavid Howells struct inode *inode = d_inode(source_de);
2091da177e4SLinus Torvalds const char * name = de->d_name.name;
2101da177e4SLinus Torvalds int len = de->d_name.len;
2111da177e4SLinus Torvalds int error;
2121da177e4SLinus Torvalds
213a7400222SAl Viro if (is_root_inode(dir_inode) && coda_iscontrol(name, len))
2141da177e4SLinus Torvalds return -EPERM;
2151da177e4SLinus Torvalds
2161da177e4SLinus Torvalds error = venus_link(dir_inode->i_sb, coda_i2f(inode),
2171da177e4SLinus Torvalds coda_i2f(dir_inode), (const char *)name, len);
2181da177e4SLinus Torvalds if (error) {
2191da177e4SLinus Torvalds d_drop(de);
220f7cc02b8SYoshihisa Abe return error;
2211da177e4SLinus Torvalds }
2221da177e4SLinus Torvalds
223d728900cSJan Harkes coda_dir_update_mtime(dir_inode);
2247de9c6eeSAl Viro ihold(inode);
2251da177e4SLinus Torvalds d_instantiate(de, inode);
226d8c76e6fSDave Hansen inc_nlink(inode);
227f7cc02b8SYoshihisa Abe return 0;
2281da177e4SLinus Torvalds }
2291da177e4SLinus Torvalds
2301da177e4SLinus Torvalds
coda_symlink(struct mnt_idmap * idmap,struct inode * dir_inode,struct dentry * de,const char * symname)2317a77db95SChristian Brauner static int coda_symlink(struct mnt_idmap *idmap,
232549c7297SChristian Brauner struct inode *dir_inode, struct dentry *de,
2331da177e4SLinus Torvalds const char *symname)
2341da177e4SLinus Torvalds {
2351da177e4SLinus Torvalds const char *name = de->d_name.name;
2361da177e4SLinus Torvalds int len = de->d_name.len;
2371da177e4SLinus Torvalds int symlen;
238f7cc02b8SYoshihisa Abe int error;
2391da177e4SLinus Torvalds
240a7400222SAl Viro if (is_root_inode(dir_inode) && coda_iscontrol(name, len))
2411da177e4SLinus Torvalds return -EPERM;
2421da177e4SLinus Torvalds
2431da177e4SLinus Torvalds symlen = strlen(symname);
244f7cc02b8SYoshihisa Abe if (symlen > CODA_MAXPATHLEN)
2451da177e4SLinus Torvalds return -ENAMETOOLONG;
2461da177e4SLinus Torvalds
2471da177e4SLinus Torvalds /*
2481da177e4SLinus Torvalds * This entry is now negative. Since we do not create
2491da177e4SLinus Torvalds * an inode for the entry we have to drop it.
2501da177e4SLinus Torvalds */
2511da177e4SLinus Torvalds d_drop(de);
2521da177e4SLinus Torvalds error = venus_symlink(dir_inode->i_sb, coda_i2f(dir_inode), name, len,
2531da177e4SLinus Torvalds symname, symlen);
2541da177e4SLinus Torvalds
2551da177e4SLinus Torvalds /* mtime is no good anymore */
2561da177e4SLinus Torvalds if (!error)
257d728900cSJan Harkes coda_dir_update_mtime(dir_inode);
2581da177e4SLinus Torvalds
2591da177e4SLinus Torvalds return error;
2601da177e4SLinus Torvalds }
2611da177e4SLinus Torvalds
2621da177e4SLinus Torvalds /* destruction routines: unlink, rmdir */
coda_unlink(struct inode * dir,struct dentry * de)2639fe76c76SHarvey Harrison static int coda_unlink(struct inode *dir, struct dentry *de)
2641da177e4SLinus Torvalds {
2651da177e4SLinus Torvalds int error;
2661da177e4SLinus Torvalds const char *name = de->d_name.name;
2671da177e4SLinus Torvalds int len = de->d_name.len;
2681da177e4SLinus Torvalds
2691da177e4SLinus Torvalds error = venus_remove(dir->i_sb, coda_i2f(dir), name, len);
270f7cc02b8SYoshihisa Abe if (error)
2711da177e4SLinus Torvalds return error;
2721da177e4SLinus Torvalds
273d728900cSJan Harkes coda_dir_update_mtime(dir);
2742b0143b5SDavid Howells drop_nlink(d_inode(de));
2751da177e4SLinus Torvalds return 0;
2761da177e4SLinus Torvalds }
2771da177e4SLinus Torvalds
coda_rmdir(struct inode * dir,struct dentry * de)2789fe76c76SHarvey Harrison static int coda_rmdir(struct inode *dir, struct dentry *de)
2791da177e4SLinus Torvalds {
2801da177e4SLinus Torvalds const char *name = de->d_name.name;
2811da177e4SLinus Torvalds int len = de->d_name.len;
2821da177e4SLinus Torvalds int error;
2831da177e4SLinus Torvalds
2841da177e4SLinus Torvalds error = venus_rmdir(dir->i_sb, coda_i2f(dir), name, len);
2858c6d2152SJan Harkes if (!error) {
2868c6d2152SJan Harkes /* VFS may delete the child */
2872b0143b5SDavid Howells if (d_really_is_positive(de))
2882b0143b5SDavid Howells clear_nlink(d_inode(de));
2891da177e4SLinus Torvalds
2908c6d2152SJan Harkes /* fix the link count of the parent */
291d728900cSJan Harkes coda_dir_drop_nlink(dir);
292d728900cSJan Harkes coda_dir_update_mtime(dir);
2938c6d2152SJan Harkes }
2948c6d2152SJan Harkes return error;
2951da177e4SLinus Torvalds }
2961da177e4SLinus Torvalds
2971da177e4SLinus Torvalds /* rename */
coda_rename(struct mnt_idmap * idmap,struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry,unsigned int flags)298e18275aeSChristian Brauner static int coda_rename(struct mnt_idmap *idmap, struct inode *old_dir,
299549c7297SChristian Brauner struct dentry *old_dentry, struct inode *new_dir,
300549c7297SChristian Brauner struct dentry *new_dentry, unsigned int flags)
3011da177e4SLinus Torvalds {
3021da177e4SLinus Torvalds const char *old_name = old_dentry->d_name.name;
3031da177e4SLinus Torvalds const char *new_name = new_dentry->d_name.name;
3041da177e4SLinus Torvalds int old_length = old_dentry->d_name.len;
3051da177e4SLinus Torvalds int new_length = new_dentry->d_name.len;
3061da177e4SLinus Torvalds int error;
3071da177e4SLinus Torvalds
3081cd66c93SMiklos Szeredi if (flags)
3091cd66c93SMiklos Szeredi return -EINVAL;
3101cd66c93SMiklos Szeredi
3111da177e4SLinus Torvalds error = venus_rename(old_dir->i_sb, coda_i2f(old_dir),
3121da177e4SLinus Torvalds coda_i2f(new_dir), old_length, new_length,
3131da177e4SLinus Torvalds (const char *) old_name, (const char *)new_name);
3141da177e4SLinus Torvalds if (!error) {
3152b0143b5SDavid Howells if (d_really_is_positive(new_dentry)) {
316e36cb0b8SDavid Howells if (d_is_dir(new_dentry)) {
317d728900cSJan Harkes coda_dir_drop_nlink(old_dir);
318d728900cSJan Harkes coda_dir_inc_nlink(new_dir);
319d728900cSJan Harkes }
320b2e36228SJan Harkes coda_flag_inode(d_inode(new_dentry), C_VATTR);
321b2e36228SJan Harkes }
322d728900cSJan Harkes coda_dir_update_mtime(old_dir);
323d728900cSJan Harkes coda_dir_update_mtime(new_dir);
3241da177e4SLinus Torvalds }
3251da177e4SLinus Torvalds return error;
3261da177e4SLinus Torvalds }
3271da177e4SLinus Torvalds
CDT2DT(unsigned char cdt)3281da177e4SLinus Torvalds static inline unsigned int CDT2DT(unsigned char cdt)
3291da177e4SLinus Torvalds {
3301da177e4SLinus Torvalds unsigned int dt;
3311da177e4SLinus Torvalds
3321da177e4SLinus Torvalds switch(cdt) {
3331da177e4SLinus Torvalds case CDT_UNKNOWN: dt = DT_UNKNOWN; break;
3341da177e4SLinus Torvalds case CDT_FIFO: dt = DT_FIFO; break;
3351da177e4SLinus Torvalds case CDT_CHR: dt = DT_CHR; break;
3361da177e4SLinus Torvalds case CDT_DIR: dt = DT_DIR; break;
3371da177e4SLinus Torvalds case CDT_BLK: dt = DT_BLK; break;
3381da177e4SLinus Torvalds case CDT_REG: dt = DT_REG; break;
3391da177e4SLinus Torvalds case CDT_LNK: dt = DT_LNK; break;
3401da177e4SLinus Torvalds case CDT_SOCK: dt = DT_SOCK; break;
3411da177e4SLinus Torvalds case CDT_WHT: dt = DT_WHT; break;
3421da177e4SLinus Torvalds default: dt = DT_UNKNOWN; break;
3431da177e4SLinus Torvalds }
3441da177e4SLinus Torvalds return dt;
3451da177e4SLinus Torvalds }
3461da177e4SLinus Torvalds
3471da177e4SLinus Torvalds /* support routines */
coda_venus_readdir(struct file * coda_file,struct dir_context * ctx)348e924f251SAl Viro static int coda_venus_readdir(struct file *coda_file, struct dir_context *ctx)
3491da177e4SLinus Torvalds {
35097875253SJan Harkes struct coda_file_info *cfi;
35197875253SJan Harkes struct coda_inode_info *cii;
35297875253SJan Harkes struct file *host_file;
3531da177e4SLinus Torvalds struct venus_dirent *vdir;
354ee60498fSAl Viro unsigned long vdir_size = offsetof(struct venus_dirent, d_name);
3551da177e4SLinus Torvalds unsigned int type;
3561da177e4SLinus Torvalds struct qstr name;
3571da177e4SLinus Torvalds ino_t ino;
35897875253SJan Harkes int ret;
35997875253SJan Harkes
3605bb44810SFabian Frederick cfi = coda_ftoc(coda_file);
36197875253SJan Harkes host_file = cfi->cfi_container;
36297875253SJan Harkes
36393fe74b2SAl Viro cii = ITOC(file_inode(coda_file));
3641da177e4SLinus Torvalds
365f52720caSPanagiotis Issaris vdir = kmalloc(sizeof(*vdir), GFP_KERNEL);
3661da177e4SLinus Torvalds if (!vdir) return -ENOMEM;
3671da177e4SLinus Torvalds
368e924f251SAl Viro if (!dir_emit_dots(coda_file, ctx))
3695f47c7eaSAl Viro goto out;
370e924f251SAl Viro
3711da177e4SLinus Torvalds while (1) {
372bdd1d2d3SChristoph Hellwig loff_t pos = ctx->pos - 2;
373bdd1d2d3SChristoph Hellwig
3741da177e4SLinus Torvalds /* read entries from the directory file */
375bdd1d2d3SChristoph Hellwig ret = kernel_read(host_file, vdir, sizeof(*vdir), &pos);
3761da177e4SLinus Torvalds if (ret < 0) {
3776d6bd94fSFabian Frederick pr_err("%s: read dir %s failed %d\n",
3786d6bd94fSFabian Frederick __func__, coda_f2s(&cii->c_fid), ret);
3791da177e4SLinus Torvalds break;
3801da177e4SLinus Torvalds }
3811da177e4SLinus Torvalds if (ret == 0) break; /* end of directory file reached */
3821da177e4SLinus Torvalds
3831da177e4SLinus Torvalds /* catch truncated reads */
3841da177e4SLinus Torvalds if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) {
3856d6bd94fSFabian Frederick pr_err("%s: short read on %s\n",
3866d6bd94fSFabian Frederick __func__, coda_f2s(&cii->c_fid));
3871da177e4SLinus Torvalds ret = -EBADF;
3881da177e4SLinus Torvalds break;
3891da177e4SLinus Torvalds }
3901da177e4SLinus Torvalds /* validate whether the directory file actually makes sense */
3911da177e4SLinus Torvalds if (vdir->d_reclen < vdir_size + vdir->d_namlen) {
3926d6bd94fSFabian Frederick pr_err("%s: invalid dir %s\n",
3936d6bd94fSFabian Frederick __func__, coda_f2s(&cii->c_fid));
3941da177e4SLinus Torvalds ret = -EBADF;
3951da177e4SLinus Torvalds break;
3961da177e4SLinus Torvalds }
3971da177e4SLinus Torvalds
3981da177e4SLinus Torvalds name.len = vdir->d_namlen;
3991da177e4SLinus Torvalds name.name = vdir->d_name;
4001da177e4SLinus Torvalds
4011da177e4SLinus Torvalds /* Make sure we skip '.' and '..', we already got those */
4021da177e4SLinus Torvalds if (name.name[0] == '.' && (name.len == 1 ||
403e924f251SAl Viro (name.name[1] == '.' && name.len == 2)))
4041da177e4SLinus Torvalds vdir->d_fileno = name.len = 0;
4051da177e4SLinus Torvalds
4061da177e4SLinus Torvalds /* skip null entries */
4071da177e4SLinus Torvalds if (vdir->d_fileno && name.len) {
4086b5e1223SAl Viro ino = vdir->d_fileno;
4091da177e4SLinus Torvalds type = CDT2DT(vdir->d_type);
410e924f251SAl Viro if (!dir_emit(ctx, name.name, name.len, ino, type))
411e924f251SAl Viro break;
4121da177e4SLinus Torvalds }
4131da177e4SLinus Torvalds /* we'll always have progress because d_reclen is unsigned and
4141da177e4SLinus Torvalds * we've already established it is non-zero. */
415e924f251SAl Viro ctx->pos += vdir->d_reclen;
4161da177e4SLinus Torvalds }
4175f47c7eaSAl Viro out:
4181da177e4SLinus Torvalds kfree(vdir);
419e924f251SAl Viro return 0;
4201da177e4SLinus Torvalds }
4211da177e4SLinus Torvalds
422b625032bSFabian Frederick /* file operations for directories */
coda_readdir(struct file * coda_file,struct dir_context * ctx)423b625032bSFabian Frederick static int coda_readdir(struct file *coda_file, struct dir_context *ctx)
424b625032bSFabian Frederick {
425b625032bSFabian Frederick struct coda_file_info *cfi;
426b625032bSFabian Frederick struct file *host_file;
427b625032bSFabian Frederick int ret;
428b625032bSFabian Frederick
4295bb44810SFabian Frederick cfi = coda_ftoc(coda_file);
430b625032bSFabian Frederick host_file = cfi->cfi_container;
431b625032bSFabian Frederick
432*3e327154SLinus Torvalds if (host_file->f_op->iterate_shared) {
433b625032bSFabian Frederick struct inode *host_inode = file_inode(host_file);
434b625032bSFabian Frederick ret = -ENOENT;
435b625032bSFabian Frederick if (!IS_DEADDIR(host_inode)) {
43661922694SAl Viro inode_lock_shared(host_inode);
43761922694SAl Viro ret = host_file->f_op->iterate_shared(host_file, ctx);
43861922694SAl Viro file_accessed(host_file);
43961922694SAl Viro inode_unlock_shared(host_inode);
44061922694SAl Viro }
441b625032bSFabian Frederick return ret;
442b625032bSFabian Frederick }
443b625032bSFabian Frederick /* Venus: we must read Venus dirents from a file */
444b625032bSFabian Frederick return coda_venus_readdir(coda_file, ctx);
445b625032bSFabian Frederick }
446b625032bSFabian Frederick
4471da177e4SLinus Torvalds /* called when a cache lookup succeeds */
coda_dentry_revalidate(struct dentry * de,unsigned int flags)4480b728e19SAl Viro static int coda_dentry_revalidate(struct dentry *de, unsigned int flags)
4491da177e4SLinus Torvalds {
45034286d66SNick Piggin struct inode *inode;
4511da177e4SLinus Torvalds struct coda_inode_info *cii;
4521da177e4SLinus Torvalds
4530b728e19SAl Viro if (flags & LOOKUP_RCU)
45434286d66SNick Piggin return -ECHILD;
45534286d66SNick Piggin
4562b0143b5SDavid Howells inode = d_inode(de);
457a7400222SAl Viro if (!inode || is_root_inode(inode))
4581da177e4SLinus Torvalds goto out;
4591da177e4SLinus Torvalds if (is_bad_inode(inode))
4601da177e4SLinus Torvalds goto bad;
4611da177e4SLinus Torvalds
4622b0143b5SDavid Howells cii = ITOC(d_inode(de));
4631da177e4SLinus Torvalds if (!(cii->c_flags & (C_PURGE | C_FLUSH)))
4641da177e4SLinus Torvalds goto out;
4651da177e4SLinus Torvalds
4661da177e4SLinus Torvalds shrink_dcache_parent(de);
4671da177e4SLinus Torvalds
4681da177e4SLinus Torvalds /* propagate for a flush */
4691da177e4SLinus Torvalds if (cii->c_flags & C_FLUSH)
4701da177e4SLinus Torvalds coda_flag_inode_children(inode, C_FLUSH);
4711da177e4SLinus Torvalds
47284d08fa8SAl Viro if (d_count(de) > 1)
4731da177e4SLinus Torvalds /* pretend it's valid, but don't change the flags */
4741da177e4SLinus Torvalds goto out;
4751da177e4SLinus Torvalds
4761da177e4SLinus Torvalds /* clear the flags. */
477b5ce1d83SYoshihisa Abe spin_lock(&cii->c_lock);
4781da177e4SLinus Torvalds cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
479b5ce1d83SYoshihisa Abe spin_unlock(&cii->c_lock);
4801da177e4SLinus Torvalds bad:
4811da177e4SLinus Torvalds return 0;
4821da177e4SLinus Torvalds out:
4831da177e4SLinus Torvalds return 1;
4841da177e4SLinus Torvalds }
4851da177e4SLinus Torvalds
4861da177e4SLinus Torvalds /*
4871da177e4SLinus Torvalds * This is the callback from dput() when d_count is going to 0.
4881da177e4SLinus Torvalds * We use this to unhash dentries with bad inodes.
4891da177e4SLinus Torvalds */
coda_dentry_delete(const struct dentry * dentry)490fe15ce44SNick Piggin static int coda_dentry_delete(const struct dentry * dentry)
4911da177e4SLinus Torvalds {
49218319cb4SJan Harkes struct inode *inode;
49318319cb4SJan Harkes struct coda_inode_info *cii;
4941da177e4SLinus Torvalds
4952b0143b5SDavid Howells if (d_really_is_negative(dentry))
4961da177e4SLinus Torvalds return 0;
4971da177e4SLinus Torvalds
49818319cb4SJan Harkes inode = d_inode(dentry);
49918319cb4SJan Harkes if (!inode || is_bad_inode(inode))
5001da177e4SLinus Torvalds return 1;
50118319cb4SJan Harkes
50218319cb4SJan Harkes cii = ITOC(inode);
50318319cb4SJan Harkes if (cii->c_flags & C_PURGE)
50418319cb4SJan Harkes return 1;
50518319cb4SJan Harkes
5061da177e4SLinus Torvalds return 0;
5071da177e4SLinus Torvalds }
5081da177e4SLinus Torvalds
5091da177e4SLinus Torvalds
5101da177e4SLinus Torvalds
5111da177e4SLinus Torvalds /*
5121da177e4SLinus Torvalds * This is called when we want to check if the inode has
5131da177e4SLinus Torvalds * changed on the server. Coda makes this easy since the
5141da177e4SLinus Torvalds * cache manager Venus issues a downcall to the kernel when this
5151da177e4SLinus Torvalds * happens
5161da177e4SLinus Torvalds */
coda_revalidate_inode(struct inode * inode)51711d100d9SAl Viro int coda_revalidate_inode(struct inode *inode)
5181da177e4SLinus Torvalds {
5191da177e4SLinus Torvalds struct coda_vattr attr;
520f7cc02b8SYoshihisa Abe int error;
5211da177e4SLinus Torvalds int old_mode;
5221da177e4SLinus Torvalds ino_t old_ino;
5231da177e4SLinus Torvalds struct coda_inode_info *cii = ITOC(inode);
5241da177e4SLinus Torvalds
5251da177e4SLinus Torvalds if (!cii->c_flags)
526f7cc02b8SYoshihisa Abe return 0;
5271da177e4SLinus Torvalds
5281da177e4SLinus Torvalds if (cii->c_flags & (C_VATTR | C_PURGE | C_FLUSH)) {
5291da177e4SLinus Torvalds error = venus_getattr(inode->i_sb, &(cii->c_fid), &attr);
5301da177e4SLinus Torvalds if (error)
531f7cc02b8SYoshihisa Abe return -EIO;
5321da177e4SLinus Torvalds
5331da177e4SLinus Torvalds /* this inode may be lost if:
5341da177e4SLinus Torvalds - it's ino changed
5351da177e4SLinus Torvalds - type changes must be permitted for repair and
5361da177e4SLinus Torvalds missing mount points.
5371da177e4SLinus Torvalds */
5381da177e4SLinus Torvalds old_mode = inode->i_mode;
5391da177e4SLinus Torvalds old_ino = inode->i_ino;
5401da177e4SLinus Torvalds coda_vattr_to_iattr(inode, &attr);
5411da177e4SLinus Torvalds
5421da177e4SLinus Torvalds if ((old_mode & S_IFMT) != (inode->i_mode & S_IFMT)) {
543f38cfb25SFabian Frederick pr_warn("inode %ld, fid %s changed type!\n",
5441da177e4SLinus Torvalds inode->i_ino, coda_f2s(&(cii->c_fid)));
5451da177e4SLinus Torvalds }
5461da177e4SLinus Torvalds
5471da177e4SLinus Torvalds /* the following can happen when a local fid is replaced
5481da177e4SLinus Torvalds with a global one, here we lose and declare the inode bad */
5491da177e4SLinus Torvalds if (inode->i_ino != old_ino)
550f7cc02b8SYoshihisa Abe return -EIO;
5511da177e4SLinus Torvalds
5521da177e4SLinus Torvalds coda_flag_inode_children(inode, C_FLUSH);
553b5ce1d83SYoshihisa Abe
554b5ce1d83SYoshihisa Abe spin_lock(&cii->c_lock);
5551da177e4SLinus Torvalds cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
556b5ce1d83SYoshihisa Abe spin_unlock(&cii->c_lock);
5571da177e4SLinus Torvalds }
5581da177e4SLinus Torvalds return 0;
5591da177e4SLinus Torvalds }
560b625032bSFabian Frederick
561b625032bSFabian Frederick const struct dentry_operations coda_dentry_operations = {
562b625032bSFabian Frederick .d_revalidate = coda_dentry_revalidate,
563b625032bSFabian Frederick .d_delete = coda_dentry_delete,
564b625032bSFabian Frederick };
565b625032bSFabian Frederick
566b625032bSFabian Frederick const struct inode_operations coda_dir_inode_operations = {
567b625032bSFabian Frederick .create = coda_create,
568b625032bSFabian Frederick .lookup = coda_lookup,
569b625032bSFabian Frederick .link = coda_link,
570b625032bSFabian Frederick .unlink = coda_unlink,
571b625032bSFabian Frederick .symlink = coda_symlink,
572b625032bSFabian Frederick .mkdir = coda_mkdir,
573b625032bSFabian Frederick .rmdir = coda_rmdir,
574b625032bSFabian Frederick .mknod = CODA_EIO_ERROR,
575b625032bSFabian Frederick .rename = coda_rename,
576b625032bSFabian Frederick .permission = coda_permission,
577b625032bSFabian Frederick .getattr = coda_getattr,
578b625032bSFabian Frederick .setattr = coda_setattr,
579b625032bSFabian Frederick };
580b625032bSFabian Frederick
581*3e327154SLinus Torvalds WRAP_DIR_ITER(coda_readdir) // FIXME!
582b625032bSFabian Frederick const struct file_operations coda_dir_operations = {
583b625032bSFabian Frederick .llseek = generic_file_llseek,
584b625032bSFabian Frederick .read = generic_read_dir,
585*3e327154SLinus Torvalds .iterate_shared = shared_coda_readdir,
586b625032bSFabian Frederick .open = coda_open,
587b625032bSFabian Frederick .release = coda_release,
588b625032bSFabian Frederick .fsync = coda_fsync,
589b625032bSFabian Frederick };
590