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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-05-16 08:49:10 -0400
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-06-10 10:41:09 -0400
commitdda54f4b872512eba484c38631bd6ae5b5716f41 (patch)
treebf9bf0b18c9cf232fa34a6f3de08e90a658259f2 /fs
parentd97a51a7e3c298d9899ea91165dfa0783fa5cc5c (diff)
nilfs2: add sufile function that can modify multiple segment usages
This is a preparation for the later cleanup patch ("nilfs2: remove list of freeing segments"). This adds nilfs_sufile_updatev() to sufile, which can modify multiple segment usages at a time. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs')
-rw-r--r--fs/nilfs2/sufile.c97
-rw-r--r--fs/nilfs2/sufile.h4
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 */
140int 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
111int nilfs_sufile_update(struct inode *sufile, __u64 segnum, int create, 208int 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 *);
46ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, struct nilfs_suinfo *, 46ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, struct nilfs_suinfo *,
47 size_t); 47 size_t);
48 48
49int 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 *));
49int nilfs_sufile_update(struct inode *, __u64, int, 53int 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 *,