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| author | Eric Sandeen <sandeen@redhat.com> | 2012-04-30 22:11:29 +0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-07-23 00:00:15 +0400 |
| commit | e8b96eb5034a0ccebf36760f88e31ea3e3cdf1e4 (patch) | |
| tree | 3ea1b85311b3d059f2bbf38e484aa2ce06bab017 /fs/ext4/file.c | |
| parent | 4ea425b63a3dfeb7707fc7cc7161c11a51e871ed (diff) | |
| download | linux-e8b96eb5034a0ccebf36760f88e31ea3e3cdf1e4.tar.xz | |
vfs: allow custom EOF in generic_file_llseek code
For ext3/4 htree directories, using the vfs llseek function with
SEEK_END goes to i_size like for any other file, but in reality
we want the maximum possible hash value. Recent changes
in ext4 have cut & pasted generic_file_llseek() back into fs/ext4/dir.c,
but replicating this core code seems like a bad idea, especially
since the copy has already diverged from the vfs.
This patch updates generic_file_llseek_size to accept
both a custom maximum offset, and a custom EOF position. With this
in place, ext4_dir_llseek can pass in the appropriate maximum hash
position for both maxsize and eof, and get what it wants.
As far as I know, this does not fix any bugs - nfs in the kernel
doesn't use SEEK_END, and I don't know of any user who does. But
some ext4 folks seem keen on doing the right thing here, and I can't
really argue.
(Patch also fixes up some comments slightly)
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/ext4/file.c')
| -rw-r--r-- | fs/ext4/file.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 8c7642a00054..f3dadd0a0d51 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -225,7 +225,8 @@ loff_t ext4_llseek(struct file *file, loff_t offset, int origin) else maxbytes = inode->i_sb->s_maxbytes; - return generic_file_llseek_size(file, offset, origin, maxbytes); + return generic_file_llseek_size(file, offset, origin, + maxbytes, i_size_read(inode)); } const struct file_operations ext4_file_operations = { |