This source file includes following definitions.
- xfs_break_leased_layouts
- xfs_fs_get_uuid
- xfs_fs_map_blocks
- xfs_pnfs_validate_isize
- xfs_fs_commit_blocks
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4
5 #include "xfs.h"
6 #include "xfs_shared.h"
7 #include "xfs_format.h"
8 #include "xfs_log_format.h"
9 #include "xfs_trans_resv.h"
10 #include "xfs_mount.h"
11 #include "xfs_inode.h"
12 #include "xfs_trans.h"
13 #include "xfs_bmap.h"
14 #include "xfs_iomap.h"
15
16
17
18
19
20
21
22
23
24
25
26 int
27 xfs_break_leased_layouts(
28 struct inode *inode,
29 uint *iolock,
30 bool *did_unlock)
31 {
32 struct xfs_inode *ip = XFS_I(inode);
33 int error;
34
35 while ((error = break_layout(inode, false)) == -EWOULDBLOCK) {
36 xfs_iunlock(ip, *iolock);
37 *did_unlock = true;
38 error = break_layout(inode, true);
39 *iolock &= ~XFS_IOLOCK_SHARED;
40 *iolock |= XFS_IOLOCK_EXCL;
41 xfs_ilock(ip, *iolock);
42 }
43
44 return error;
45 }
46
47
48
49
50
51 int
52 xfs_fs_get_uuid(
53 struct super_block *sb,
54 u8 *buf,
55 u32 *len,
56 u64 *offset)
57 {
58 struct xfs_mount *mp = XFS_M(sb);
59
60 printk_once(KERN_NOTICE
61 "XFS (%s): using experimental pNFS feature, use at your own risk!\n",
62 mp->m_fsname);
63
64 if (*len < sizeof(uuid_t))
65 return -EINVAL;
66
67 memcpy(buf, &mp->m_sb.sb_uuid, sizeof(uuid_t));
68 *len = sizeof(uuid_t);
69 *offset = offsetof(struct xfs_dsb, sb_uuid);
70 return 0;
71 }
72
73
74
75
76 int
77 xfs_fs_map_blocks(
78 struct inode *inode,
79 loff_t offset,
80 u64 length,
81 struct iomap *iomap,
82 bool write,
83 u32 *device_generation)
84 {
85 struct xfs_inode *ip = XFS_I(inode);
86 struct xfs_mount *mp = ip->i_mount;
87 struct xfs_bmbt_irec imap;
88 xfs_fileoff_t offset_fsb, end_fsb;
89 loff_t limit;
90 int bmapi_flags = XFS_BMAPI_ENTIRE;
91 int nimaps = 1;
92 uint lock_flags;
93 int error = 0;
94
95 if (XFS_FORCED_SHUTDOWN(mp))
96 return -EIO;
97
98
99
100
101
102
103 if (XFS_IS_REALTIME_INODE(ip))
104 return -ENXIO;
105
106
107
108
109
110 if (xfs_is_reflink_inode(ip))
111 return -ENXIO;
112
113
114
115
116
117
118
119
120 xfs_ilock(ip, XFS_IOLOCK_EXCL);
121
122 error = -EINVAL;
123 limit = mp->m_super->s_maxbytes;
124 if (!write)
125 limit = max(limit, round_up(i_size_read(inode),
126 inode->i_sb->s_blocksize));
127 if (offset > limit)
128 goto out_unlock;
129 if (offset > limit - length)
130 length = limit - offset;
131
132 error = filemap_write_and_wait(inode->i_mapping);
133 if (error)
134 goto out_unlock;
135 error = invalidate_inode_pages2(inode->i_mapping);
136 if (WARN_ON_ONCE(error))
137 return error;
138
139 end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + length);
140 offset_fsb = XFS_B_TO_FSBT(mp, offset);
141
142 lock_flags = xfs_ilock_data_map_shared(ip);
143 error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb,
144 &imap, &nimaps, bmapi_flags);
145 xfs_iunlock(ip, lock_flags);
146
147 if (error)
148 goto out_unlock;
149
150 if (write) {
151 enum xfs_prealloc_flags flags = 0;
152
153 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
154
155 if (!nimaps || imap.br_startblock == HOLESTARTBLOCK) {
156
157
158
159
160 xfs_ilock(ip, XFS_ILOCK_SHARED);
161 error = xfs_iomap_write_direct(ip, offset, length,
162 &imap, nimaps);
163 if (error)
164 goto out_unlock;
165
166
167
168
169
170
171
172 flags |= XFS_PREALLOC_SET | XFS_PREALLOC_SYNC;
173 }
174
175 error = xfs_update_prealloc_flags(ip, flags);
176 if (error)
177 goto out_unlock;
178 }
179 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
180
181 error = xfs_bmbt_to_iomap(ip, iomap, &imap, false);
182 *device_generation = mp->m_generation;
183 return error;
184 out_unlock:
185 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
186 return error;
187 }
188
189
190
191
192 static int
193 xfs_pnfs_validate_isize(
194 struct xfs_inode *ip,
195 xfs_off_t isize)
196 {
197 struct xfs_bmbt_irec imap;
198 int nimaps = 1;
199 int error = 0;
200
201 xfs_ilock(ip, XFS_ILOCK_SHARED);
202 error = xfs_bmapi_read(ip, XFS_B_TO_FSBT(ip->i_mount, isize - 1), 1,
203 &imap, &nimaps, 0);
204 xfs_iunlock(ip, XFS_ILOCK_SHARED);
205 if (error)
206 return error;
207
208 if (imap.br_startblock == HOLESTARTBLOCK ||
209 imap.br_startblock == DELAYSTARTBLOCK ||
210 imap.br_state == XFS_EXT_UNWRITTEN)
211 return -EIO;
212 return 0;
213 }
214
215
216
217
218
219
220
221
222
223
224
225 int
226 xfs_fs_commit_blocks(
227 struct inode *inode,
228 struct iomap *maps,
229 int nr_maps,
230 struct iattr *iattr)
231 {
232 struct xfs_inode *ip = XFS_I(inode);
233 struct xfs_mount *mp = ip->i_mount;
234 struct xfs_trans *tp;
235 bool update_isize = false;
236 int error, i;
237 loff_t size;
238
239 ASSERT(iattr->ia_valid & (ATTR_ATIME|ATTR_CTIME|ATTR_MTIME));
240
241 xfs_ilock(ip, XFS_IOLOCK_EXCL);
242
243 size = i_size_read(inode);
244 if ((iattr->ia_valid & ATTR_SIZE) && iattr->ia_size > size) {
245 update_isize = true;
246 size = iattr->ia_size;
247 }
248
249 for (i = 0; i < nr_maps; i++) {
250 u64 start, length, end;
251
252 start = maps[i].offset;
253 if (start > size)
254 continue;
255
256 end = start + maps[i].length;
257 if (end > size)
258 end = size;
259
260 length = end - start;
261 if (!length)
262 continue;
263
264
265
266
267 error = invalidate_inode_pages2_range(inode->i_mapping,
268 start >> PAGE_SHIFT,
269 (end - 1) >> PAGE_SHIFT);
270 WARN_ON_ONCE(error);
271
272 error = xfs_iomap_write_unwritten(ip, start, length, false);
273 if (error)
274 goto out_drop_iolock;
275 }
276
277 if (update_isize) {
278 error = xfs_pnfs_validate_isize(ip, size);
279 if (error)
280 goto out_drop_iolock;
281 }
282
283 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
284 if (error)
285 goto out_drop_iolock;
286
287 xfs_ilock(ip, XFS_ILOCK_EXCL);
288 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
289 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
290
291 xfs_setattr_time(ip, iattr);
292 if (update_isize) {
293 i_size_write(inode, iattr->ia_size);
294 ip->i_d.di_size = iattr->ia_size;
295 }
296
297 xfs_trans_set_sync(tp);
298 error = xfs_trans_commit(tp);
299
300 out_drop_iolock:
301 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
302 return error;
303 }