diff options
Diffstat (limited to 'fs')
-rw-r--r-- | fs/nilfs2/sufile.c | 97 | ||||
-rw-r--r-- | fs/nilfs2/sufile.h | 4 |
2 files changed, 101 insertions, 0 deletions
diff --git a/fs/nilfs2/sufile.c b/fs/nilfs2/sufile.c index 98e68677f045..da127325fdaa 100644 --- a/fs/nilfs2/sufile.c +++ b/fs/nilfs2/sufile.c | |||
@@ -18,6 +18,7 @@ | |||
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | 18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
19 | * | 19 | * |
20 | * Written by Koji Sato <koji@osrg.net>. | 20 | * Written by Koji Sato <koji@osrg.net>. |
21 | * Rivised by Ryusuke Konishi <ryusuke@osrg.net>. | ||
21 | */ | 22 | */ |
22 | 23 | ||
23 | #include <linux/kernel.h> | 24 | #include <linux/kernel.h> |
@@ -108,6 +109,102 @@ static void nilfs_sufile_mod_counter(struct buffer_head *header_bh, | |||
108 | nilfs_mdt_mark_buffer_dirty(header_bh); | 109 | nilfs_mdt_mark_buffer_dirty(header_bh); |
109 | } | 110 | } |
110 | 111 | ||
112 | /** | ||
113 | * nilfs_sufile_updatev - modify multiple segment usages at a time | ||
114 | * @sufile: inode of segment usage file | ||
115 | * @segnumv: array of segment numbers | ||
116 | * @nsegs: size of @segnumv array | ||
117 | * @create: creation flag | ||
118 | * @ndone: place to store number of modified segments on @segnumv | ||
119 | * @dofunc: primitive operation for the update | ||
120 | * | ||
121 | * Description: nilfs_sufile_updatev() repeatedly calls @dofunc | ||
122 | * against the given array of segments. The @dofunc is called with | ||
123 | * buffers of a header block and the sufile block in which the target | ||
124 | * segment usage entry is contained. If @ndone is given, the number | ||
125 | * of successfully modified segments from the head is stored in the | ||
126 | * place @ndone points to. | ||
127 | * | ||
128 | * Return Value: On success, zero is returned. On error, one of the | ||
129 | * following negative error codes is returned. | ||
130 | * | ||
131 | * %-EIO - I/O error. | ||
132 | * | ||
133 | * %-ENOMEM - Insufficient amount of memory available. | ||
134 | * | ||
135 | * %-ENOENT - Given segment usage is in hole block (may be returned if | ||
136 | * @create is zero) | ||
137 | * | ||
138 | * %-EINVAL - Invalid segment usage number | ||
139 | */ | ||
140 | int nilfs_sufile_updatev(struct inode *sufile, __u64 *segnumv, size_t nsegs, | ||
141 | int create, size_t *ndone, | ||
142 | void (*dofunc)(struct inode *, __u64, | ||
143 | struct buffer_head *, | ||
144 | struct buffer_head *)) | ||
145 | { | ||
146 | struct buffer_head *header_bh, *bh; | ||
147 | unsigned long blkoff, prev_blkoff; | ||
148 | __u64 *seg; | ||
149 | size_t nerr = 0, n = 0; | ||
150 | int ret = 0; | ||
151 | |||
152 | if (unlikely(nsegs == 0)) | ||
153 | goto out; | ||
154 | |||
155 | down_write(&NILFS_MDT(sufile)->mi_sem); | ||
156 | for (seg = segnumv; seg < segnumv + nsegs; seg++) { | ||
157 | if (unlikely(*seg >= nilfs_sufile_get_nsegments(sufile))) { | ||
158 | printk(KERN_WARNING | ||
159 | "%s: invalid segment number: %llu\n", __func__, | ||
160 | (unsigned long long)*seg); | ||
161 | nerr++; | ||
162 | } | ||
163 | } | ||
164 | if (nerr > 0) { | ||
165 | ret = -EINVAL; | ||
166 | goto out_sem; | ||
167 | } | ||
168 | |||
169 | ret = nilfs_sufile_get_header_block(sufile, &header_bh); | ||
170 | if (ret < 0) | ||
171 | goto out_sem; | ||
172 | |||
173 | seg = segnumv; | ||
174 | blkoff = nilfs_sufile_get_blkoff(sufile, *seg); | ||
175 | ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh); | ||
176 | if (ret < 0) | ||
177 | goto out_header; | ||
178 | |||
179 | for (;;) { | ||
180 | dofunc(sufile, *seg, header_bh, bh); | ||
181 | |||
182 | if (++seg >= segnumv + nsegs) | ||
183 | break; | ||
184 | prev_blkoff = blkoff; | ||
185 | blkoff = nilfs_sufile_get_blkoff(sufile, *seg); | ||
186 | if (blkoff == prev_blkoff) | ||
187 | continue; | ||
188 | |||
189 | /* get different block */ | ||
190 | brelse(bh); | ||
191 | ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh); | ||
192 | if (unlikely(ret < 0)) | ||
193 | goto out_header; | ||
194 | } | ||
195 | brelse(bh); | ||
196 | |||
197 | out_header: | ||
198 | n = seg - segnumv; | ||
199 | brelse(header_bh); | ||
200 | out_sem: | ||
201 | up_write(&NILFS_MDT(sufile)->mi_sem); | ||
202 | out: | ||
203 | if (ndone) | ||
204 | *ndone = n; | ||
205 | return ret; | ||
206 | } | ||
207 | |||
111 | int nilfs_sufile_update(struct inode *sufile, __u64 segnum, int create, | 208 | int nilfs_sufile_update(struct inode *sufile, __u64 segnum, int create, |
112 | void (*dofunc)(struct inode *, __u64, | 209 | void (*dofunc)(struct inode *, __u64, |
113 | struct buffer_head *, | 210 | struct buffer_head *, |
diff --git a/fs/nilfs2/sufile.h b/fs/nilfs2/sufile.h index a2e2efd4ade1..e8e26279c261 100644 --- a/fs/nilfs2/sufile.h +++ b/fs/nilfs2/sufile.h | |||
@@ -46,6 +46,10 @@ int nilfs_sufile_get_ncleansegs(struct inode *, unsigned long *); | |||
46 | ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, struct nilfs_suinfo *, | 46 | ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, struct nilfs_suinfo *, |
47 | size_t); | 47 | size_t); |
48 | 48 | ||
49 | int nilfs_sufile_updatev(struct inode *, __u64 *, size_t, int, size_t *, | ||
50 | void (*dofunc)(struct inode *, __u64, | ||
51 | struct buffer_head *, | ||
52 | struct buffer_head *)); | ||
49 | int nilfs_sufile_update(struct inode *, __u64, int, | 53 | int nilfs_sufile_update(struct inode *, __u64, int, |
50 | void (*dofunc)(struct inode *, __u64, | 54 | void (*dofunc)(struct inode *, __u64, |
51 | struct buffer_head *, | 55 | struct buffer_head *, |