This patch introduces the nilfs_sufile_set_suinfo function, which
expects an array of nilfs_suinfo_update structures and updates the
segment usage information accordingly.
This is basically a helper function for the newly introduced
NILFS_IOCTL_SET_SUINFO ioctl.
Signed-off-by: Andreas Rohner <andreas.rohner@xxxxxxx>
---
fs/nilfs2/sufile.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/nilfs2/sufile.h | 2 +-
2 files changed, 92 insertions(+), 1 deletion(-)
diff --git a/fs/nilfs2/sufile.c b/fs/nilfs2/sufile.c
index 3127e9f..81c3438 100644
--- a/fs/nilfs2/sufile.c
+++ b/fs/nilfs2/sufile.c
@@ -870,6 +870,97 @@ ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf,
}
/**
+ * nilfs_sufile_set_suinfo -
+ * @sufile: inode of segment usage file
+ * @buf: array of suinfo
+ * @supsz: byte size of suinfo
+ * @nsup: size of suinfo array
+ *
+ * Description: Takes an array of nilfs_suinfo_update structs and updates
+ * segment usage accordingly.
+ *
+ * Return Value: On success, 0 is returned and .... On error, one of the
+ * following negative error codes is returned.
+ *
+ * %-EIO - I/O error.
+ *
+ * %-ENOMEM - Insufficient amount of memory available.
+ *
+ * %-EINVAL - Invalid segment number in input
+ */
+ssize_t nilfs_sufile_set_suinfo(struct inode *sufile, void *buf,
+ unsigned supsz, size_t nsup)
+{
+ struct buffer_head *bh;
+ struct nilfs_suinfo_update *sup, *supv = buf;
+ struct nilfs_segment_usage *su;
+ void *kaddr;
+ unsigned long blkoff, prev_blkoff;
+ size_t nerr = 0;
+ int ret = 0;
+
+ if (unlikely(nsup == 0))
+ goto out;
+
+ down_write(&NILFS_MDT(sufile)->mi_sem);
+ for (sup = supv; sup < supv + nsup; sup++) {
+ if (unlikely(sup->sup_segnum >=
+ nilfs_sufile_get_nsegments(sufile))) {
+ printk(KERN_WARNING
+ "%s: invalid segment number: %llu\n", __func__,
+ (unsigned long long)sup->sup_segnum);
+ nerr++;
+ }
+ }
+ if (nerr > 0) {
+ ret = -EINVAL;
+ goto out_sem;
+ }
+
+ sup = supv;
+ blkoff = nilfs_sufile_get_blkoff(sufile, sup->sup_segnum);
+ ret = nilfs_mdt_get_block(sufile, blkoff, 1, NULL, &bh);
+ if (ret < 0)
+ goto out_sem;
+
+ for (;;) {
+ kaddr = kmap_atomic(bh->b_page);
+ su = nilfs_sufile_block_get_segment_usage(
+ sufile, sup->sup_segnum, bh, kaddr);
+
+ if (nilfs_suinfo_update_lastmod(sup))
+ su->su_lastmod = cpu_to_le64(sup->sup_sui.sui_lastmod);
+
+ if (nilfs_suinfo_update_nblocks(sup))
+ su->su_nblocks = cpu_to_le32(sup->sup_sui.sui_nblocks);
+
+ if (nilfs_suinfo_update_flags(sup))
+ su->su_flags = cpu_to_le32(sup->sup_sui.sui_flags);
+
+ kunmap_atomic(kaddr);
+
+ if (++sup >= supv + nsup)
+ break;
+ prev_blkoff = blkoff;
+ blkoff = nilfs_sufile_get_blkoff(sufile, sup->sup_segnum);
+ if (blkoff == prev_blkoff)
+ continue;
+
+ /* get different block */
+ brelse(bh);
+ ret = nilfs_mdt_get_block(sufile, blkoff, 1, NULL, &bh);
+ if (unlikely(ret < 0))
+ goto out_sem;
+ }
+ brelse(bh);
+
+ out_sem:
+ up_write(&NILFS_MDT(sufile)->mi_sem);
+ out:
+ return ret;
+}
+
+/**
* nilfs_sufile_read - read or get sufile inode
* @sb: super block instance
* @susize: size of a segment usage entry
diff --git a/fs/nilfs2/sufile.h b/fs/nilfs2/sufile.h
index e84bc5b..7aa9d3e 100644
--- a/fs/nilfs2/sufile.h
+++ b/fs/nilfs2/sufile.h
@@ -44,7 +44,7 @@ int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *);
ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, void *, unsigned,
size_t);
-
+ssize_t nilfs_sufile_set_suinfo(struct inode *, void *, unsigned , size_t);
int nilfs_sufile_updatev(struct inode *, __u64 *, size_t, int, size_t *,
void (*dofunc)(struct inode *, __u64,
struct buffer_head *,
--
1.8.5.3
--
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