xref: /openbmc/linux/fs/xfs/xfs_icreate_item.c (revision c230a4a8)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (c) 2008-2010, 2013 Dave Chinner
4  * All Rights Reserved.
5  */
6 #include "xfs.h"
7 #include "xfs_fs.h"
8 #include "xfs_shared.h"
9 #include "xfs_format.h"
10 #include "xfs_log_format.h"
11 #include "xfs_trans_resv.h"
12 #include "xfs_mount.h"
13 #include "xfs_inode.h"
14 #include "xfs_trans.h"
15 #include "xfs_trans_priv.h"
16 #include "xfs_icreate_item.h"
17 #include "xfs_log.h"
18 #include "xfs_log_priv.h"
19 #include "xfs_log_recover.h"
20 #include "xfs_ialloc.h"
21 #include "xfs_trace.h"
22 
23 struct kmem_cache	*xfs_icreate_cache;		/* inode create item */
24 
ICR_ITEM(struct xfs_log_item * lip)25 static inline struct xfs_icreate_item *ICR_ITEM(struct xfs_log_item *lip)
26 {
27 	return container_of(lip, struct xfs_icreate_item, ic_item);
28 }
29 
30 /*
31  * This returns the number of iovecs needed to log the given inode item.
32  *
33  * We only need one iovec for the icreate log structure.
34  */
35 STATIC void
xfs_icreate_item_size(struct xfs_log_item * lip,int * nvecs,int * nbytes)36 xfs_icreate_item_size(
37 	struct xfs_log_item	*lip,
38 	int			*nvecs,
39 	int			*nbytes)
40 {
41 	*nvecs += 1;
42 	*nbytes += sizeof(struct xfs_icreate_log);
43 }
44 
45 /*
46  * This is called to fill in the vector of log iovecs for the
47  * given inode create log item.
48  */
49 STATIC void
xfs_icreate_item_format(struct xfs_log_item * lip,struct xfs_log_vec * lv)50 xfs_icreate_item_format(
51 	struct xfs_log_item	*lip,
52 	struct xfs_log_vec	*lv)
53 {
54 	struct xfs_icreate_item	*icp = ICR_ITEM(lip);
55 	struct xfs_log_iovec	*vecp = NULL;
56 
57 	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_ICREATE,
58 			&icp->ic_format,
59 			sizeof(struct xfs_icreate_log));
60 }
61 
62 STATIC void
xfs_icreate_item_release(struct xfs_log_item * lip)63 xfs_icreate_item_release(
64 	struct xfs_log_item	*lip)
65 {
66 	kmem_free(ICR_ITEM(lip)->ic_item.li_lv_shadow);
67 	kmem_cache_free(xfs_icreate_cache, ICR_ITEM(lip));
68 }
69 
70 static const struct xfs_item_ops xfs_icreate_item_ops = {
71 	.flags		= XFS_ITEM_RELEASE_WHEN_COMMITTED,
72 	.iop_size	= xfs_icreate_item_size,
73 	.iop_format	= xfs_icreate_item_format,
74 	.iop_release	= xfs_icreate_item_release,
75 };
76 
77 
78 /*
79  * Initialize the inode log item for a newly allocated (in-core) inode.
80  *
81  * Inode extents can only reside within an AG. Hence specify the starting
82  * block for the inode chunk by offset within an AG as well as the
83  * length of the allocated extent.
84  *
85  * This joins the item to the transaction and marks it dirty so
86  * that we don't need a separate call to do this, nor does the
87  * caller need to know anything about the icreate item.
88  */
89 void
xfs_icreate_log(struct xfs_trans * tp,xfs_agnumber_t agno,xfs_agblock_t agbno,unsigned int count,unsigned int inode_size,xfs_agblock_t length,unsigned int generation)90 xfs_icreate_log(
91 	struct xfs_trans	*tp,
92 	xfs_agnumber_t		agno,
93 	xfs_agblock_t		agbno,
94 	unsigned int		count,
95 	unsigned int		inode_size,
96 	xfs_agblock_t		length,
97 	unsigned int		generation)
98 {
99 	struct xfs_icreate_item	*icp;
100 
101 	icp = kmem_cache_zalloc(xfs_icreate_cache, GFP_KERNEL | __GFP_NOFAIL);
102 
103 	xfs_log_item_init(tp->t_mountp, &icp->ic_item, XFS_LI_ICREATE,
104 			  &xfs_icreate_item_ops);
105 
106 	icp->ic_format.icl_type = XFS_LI_ICREATE;
107 	icp->ic_format.icl_size = 1;	/* single vector */
108 	icp->ic_format.icl_ag = cpu_to_be32(agno);
109 	icp->ic_format.icl_agbno = cpu_to_be32(agbno);
110 	icp->ic_format.icl_count = cpu_to_be32(count);
111 	icp->ic_format.icl_isize = cpu_to_be32(inode_size);
112 	icp->ic_format.icl_length = cpu_to_be32(length);
113 	icp->ic_format.icl_gen = cpu_to_be32(generation);
114 
115 	xfs_trans_add_item(tp, &icp->ic_item);
116 	tp->t_flags |= XFS_TRANS_DIRTY;
117 	set_bit(XFS_LI_DIRTY, &icp->ic_item.li_flags);
118 }
119 
120 static enum xlog_recover_reorder
xlog_recover_icreate_reorder(struct xlog_recover_item * item)121 xlog_recover_icreate_reorder(
122 		struct xlog_recover_item *item)
123 {
124 	/*
125 	 * Inode allocation buffers must be replayed before subsequent inode
126 	 * items try to modify those buffers.  ICREATE items are the logical
127 	 * equivalent of logging a newly initialized inode buffer, so recover
128 	 * these at the same time that we recover logged buffers.
129 	 */
130 	return XLOG_REORDER_BUFFER_LIST;
131 }
132 
133 /*
134  * This routine is called when an inode create format structure is found in a
135  * committed transaction in the log.  It's purpose is to initialise the inodes
136  * being allocated on disk. This requires us to get inode cluster buffers that
137  * match the range to be initialised, stamped with inode templates and written
138  * by delayed write so that subsequent modifications will hit the cached buffer
139  * and only need writing out at the end of recovery.
140  */
141 STATIC int
xlog_recover_icreate_commit_pass2(struct xlog * log,struct list_head * buffer_list,struct xlog_recover_item * item,xfs_lsn_t lsn)142 xlog_recover_icreate_commit_pass2(
143 	struct xlog			*log,
144 	struct list_head		*buffer_list,
145 	struct xlog_recover_item	*item,
146 	xfs_lsn_t			lsn)
147 {
148 	struct xfs_mount		*mp = log->l_mp;
149 	struct xfs_icreate_log		*icl;
150 	struct xfs_ino_geometry		*igeo = M_IGEO(mp);
151 	xfs_agnumber_t			agno;
152 	xfs_agblock_t			agbno;
153 	unsigned int			count;
154 	unsigned int			isize;
155 	xfs_agblock_t			length;
156 	int				bb_per_cluster;
157 	int				cancel_count;
158 	int				nbufs;
159 	int				i;
160 
161 	icl = (struct xfs_icreate_log *)item->ri_buf[0].i_addr;
162 	if (icl->icl_type != XFS_LI_ICREATE) {
163 		xfs_warn(log->l_mp, "xlog_recover_do_icreate_trans: bad type");
164 		return -EINVAL;
165 	}
166 
167 	if (icl->icl_size != 1) {
168 		xfs_warn(log->l_mp, "xlog_recover_do_icreate_trans: bad icl size");
169 		return -EINVAL;
170 	}
171 
172 	agno = be32_to_cpu(icl->icl_ag);
173 	if (agno >= mp->m_sb.sb_agcount) {
174 		xfs_warn(log->l_mp, "xlog_recover_do_icreate_trans: bad agno");
175 		return -EINVAL;
176 	}
177 	agbno = be32_to_cpu(icl->icl_agbno);
178 	if (!agbno || agbno == NULLAGBLOCK || agbno >= mp->m_sb.sb_agblocks) {
179 		xfs_warn(log->l_mp, "xlog_recover_do_icreate_trans: bad agbno");
180 		return -EINVAL;
181 	}
182 	isize = be32_to_cpu(icl->icl_isize);
183 	if (isize != mp->m_sb.sb_inodesize) {
184 		xfs_warn(log->l_mp, "xlog_recover_do_icreate_trans: bad isize");
185 		return -EINVAL;
186 	}
187 	count = be32_to_cpu(icl->icl_count);
188 	if (!count) {
189 		xfs_warn(log->l_mp, "xlog_recover_do_icreate_trans: bad count");
190 		return -EINVAL;
191 	}
192 	length = be32_to_cpu(icl->icl_length);
193 	if (!length || length >= mp->m_sb.sb_agblocks) {
194 		xfs_warn(log->l_mp, "xlog_recover_do_icreate_trans: bad length");
195 		return -EINVAL;
196 	}
197 
198 	/*
199 	 * The inode chunk is either full or sparse and we only support
200 	 * m_ino_geo.ialloc_min_blks sized sparse allocations at this time.
201 	 */
202 	if (length != igeo->ialloc_blks &&
203 	    length != igeo->ialloc_min_blks) {
204 		xfs_warn(log->l_mp,
205 			 "%s: unsupported chunk length", __func__);
206 		return -EINVAL;
207 	}
208 
209 	/* verify inode count is consistent with extent length */
210 	if ((count >> mp->m_sb.sb_inopblog) != length) {
211 		xfs_warn(log->l_mp,
212 			 "%s: inconsistent inode count and chunk length",
213 			 __func__);
214 		return -EINVAL;
215 	}
216 
217 	/*
218 	 * The icreate transaction can cover multiple cluster buffers and these
219 	 * buffers could have been freed and reused. Check the individual
220 	 * buffers for cancellation so we don't overwrite anything written after
221 	 * a cancellation.
222 	 */
223 	bb_per_cluster = XFS_FSB_TO_BB(mp, igeo->blocks_per_cluster);
224 	nbufs = length / igeo->blocks_per_cluster;
225 	for (i = 0, cancel_count = 0; i < nbufs; i++) {
226 		xfs_daddr_t	daddr;
227 
228 		daddr = XFS_AGB_TO_DADDR(mp, agno,
229 				agbno + i * igeo->blocks_per_cluster);
230 		if (xlog_is_buffer_cancelled(log, daddr, bb_per_cluster))
231 			cancel_count++;
232 	}
233 
234 	/*
235 	 * We currently only use icreate for a single allocation at a time. This
236 	 * means we should expect either all or none of the buffers to be
237 	 * cancelled. Be conservative and skip replay if at least one buffer is
238 	 * cancelled, but warn the user that something is awry if the buffers
239 	 * are not consistent.
240 	 *
241 	 * XXX: This must be refined to only skip cancelled clusters once we use
242 	 * icreate for multiple chunk allocations.
243 	 */
244 	ASSERT(!cancel_count || cancel_count == nbufs);
245 	if (cancel_count) {
246 		if (cancel_count != nbufs)
247 			xfs_warn(mp,
248 	"WARNING: partial inode chunk cancellation, skipped icreate.");
249 		trace_xfs_log_recover_icreate_cancel(log, icl);
250 		return 0;
251 	}
252 
253 	trace_xfs_log_recover_icreate_recover(log, icl);
254 	return xfs_ialloc_inode_init(mp, NULL, buffer_list, count, agno, agbno,
255 				     length, be32_to_cpu(icl->icl_gen));
256 }
257 
258 const struct xlog_recover_item_ops xlog_icreate_item_ops = {
259 	.item_type		= XFS_LI_ICREATE,
260 	.reorder		= xlog_recover_icreate_reorder,
261 	.commit_pass2		= xlog_recover_icreate_commit_pass2,
262 };
263