Since the d_off in the first dirent for "." (that originates from
the 4th argument "offset" of filldir() for the 2nd dirent for "..")
is wrongly assigned in btrfs_real_readdir(), telldir returns same
offset for different locations.
| # mkfs.btrfs /dev/sdb1
| # mount /dev/sdb1 fs0
| # cd fs0
| # touch file0 file1
| # ../test
| telldir: 0
| readdir: d_off = 2, d_name = "."
| telldir: 2
| readdir: d_off = 2, d_name = ".."
| telldir: 2
| readdir: d_off = 3, d_name = "file0"
| telldir: 3
| readdir: d_off = 2147483647, d_name = "file1"
| telldir: 2147483647
To fix this problem, pass filp->f_pos (which is loff_t) instead of
the wrong constant value.
| # ../test
| telldir: 0
| readdir: d_off = 1, d_name = "."
| telldir: 1
| readdir: d_off = 2, d_name = ".."
| telldir: 2
| readdir: d_off = 3, d_name = "file0"
:
At the moment the "offset" for "." is unused because there is no
preceding dirent, however it is better to pass filp->f_pos to follow
grammatical usage.
Signed-off-by: Hidetoshi Seto <seto.hideto...@jp.fujitsu.com>
---
fs/btrfs/inode.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 15fceef..9c1297b 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4125,7 +4125,8 @@ static int btrfs_real_readdir(struct file *filp, void
*dirent,
/* special case for "." */
if (filp->f_pos == 0) {
- over = filldir(dirent, ".", 1, 1, btrfs_ino(inode), DT_DIR);
+ over = filldir(dirent, ".", 1,
+ filp->f_pos, inode->i_ino, DT_DIR);
if (over)
return 0;
filp->f_pos = 1;
@@ -4134,7 +4135,7 @@ static int btrfs_real_readdir(struct file *filp, void
*dirent,
if (filp->f_pos == 1) {
u64 pino = parent_ino(filp->f_path.dentry);
over = filldir(dirent, "..", 2,
- 2, pino, DT_DIR);
+ filp->f_pos, pino, DT_DIR);
if (over)
return 0;
filp->f_pos = 2;
--
1.7.6
--
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