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-rw-r--r--fs/nilfs2/cpfile.c58
1 files changed, 52 insertions, 6 deletions
diff --git a/fs/nilfs2/cpfile.c b/fs/nilfs2/cpfile.c
index 0d58075f34e2..b6596cab9e99 100644
--- a/fs/nilfs2/cpfile.c
+++ b/fs/nilfs2/cpfile.c
@@ -53,6 +53,13 @@ nilfs_cpfile_get_offset(const struct inode *cpfile, __u64 cno)
return do_div(tcno, nilfs_cpfile_checkpoints_per_block(cpfile));
}
+static __u64 nilfs_cpfile_first_checkpoint_in_block(const struct inode *cpfile,
+ unsigned long blkoff)
+{
+ return (__u64)nilfs_cpfile_checkpoints_per_block(cpfile) * blkoff
+ + 1 - NILFS_MDT(cpfile)->mi_first_entry_offset;
+}
+
static unsigned long
nilfs_cpfile_checkpoints_in_block(const struct inode *cpfile,
__u64 curr,
@@ -146,6 +153,44 @@ static inline int nilfs_cpfile_get_checkpoint_block(struct inode *cpfile,
create, nilfs_cpfile_block_init, bhp);
}
+/**
+ * nilfs_cpfile_find_checkpoint_block - find and get a buffer on cpfile
+ * @cpfile: inode of cpfile
+ * @start_cno: start checkpoint number (inclusive)
+ * @end_cno: end checkpoint number (inclusive)
+ * @cnop: place to store the next checkpoint number
+ * @bhp: place to store a pointer to buffer_head struct
+ *
+ * Return Value: On success, it returns 0. On error, the following negative
+ * error code is returned.
+ *
+ * %-ENOMEM - Insufficient memory available.
+ *
+ * %-EIO - I/O error
+ *
+ * %-ENOENT - no block exists in the range.
+ */
+static int nilfs_cpfile_find_checkpoint_block(struct inode *cpfile,
+ __u64 start_cno, __u64 end_cno,
+ __u64 *cnop,
+ struct buffer_head **bhp)
+{
+ unsigned long start, end, blkoff;
+ int ret;
+
+ if (unlikely(start_cno > end_cno))
+ return -ENOENT;
+
+ start = nilfs_cpfile_get_blkoff(cpfile, start_cno);
+ end = nilfs_cpfile_get_blkoff(cpfile, end_cno);
+
+ ret = nilfs_mdt_find_block(cpfile, start, end, &blkoff, bhp);
+ if (!ret)
+ *cnop = (blkoff == start) ? start_cno :
+ nilfs_cpfile_first_checkpoint_in_block(cpfile, blkoff);
+ return ret;
+}
+
static inline int nilfs_cpfile_delete_checkpoint_block(struct inode *cpfile,
__u64 cno)
{
@@ -403,14 +448,15 @@ static ssize_t nilfs_cpfile_do_get_cpinfo(struct inode *cpfile, __u64 *cnop,
return -ENOENT; /* checkpoint number 0 is invalid */
down_read(&NILFS_MDT(cpfile)->mi_sem);
- for (n = 0; cno < cur_cno && n < nci; cno += ncps) {
- ncps = nilfs_cpfile_checkpoints_in_block(cpfile, cno, cur_cno);
- ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &bh);
+ for (n = 0; n < nci; cno += ncps) {
+ ret = nilfs_cpfile_find_checkpoint_block(
+ cpfile, cno, cur_cno - 1, &cno, &bh);
if (ret < 0) {
- if (ret != -ENOENT)
- goto out;
- continue; /* skip hole */
+ if (likely(ret == -ENOENT))
+ break;
+ goto out;
}
+ ncps = nilfs_cpfile_checkpoints_in_block(cpfile, cno, cur_cno);
kaddr = kmap_atomic(bh->b_page);
cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr);