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| author | Dave Hansen <haveblue@us.ibm.com> | 2006-09-30 23:29:03 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-01 00:39:30 -0700 |
| commit | 9a53c3a783c2fa9b969628e65695c11c3e51e673 (patch) | |
| tree | 5a6115e18ee105246d46e3db3d5b07749d232f5b /mm | |
| parent | aab520e2f6c80160cabd187a8d0292d1cec8ff68 (diff) | |
| download | linux-9a53c3a783c2fa9b969628e65695c11c3e51e673.tar.gz linux-9a53c3a783c2fa9b969628e65695c11c3e51e673.tar.bz2 linux-9a53c3a783c2fa9b969628e65695c11c3e51e673.zip | |
[PATCH] r/o bind mounts: unlink: monitor i_nlink
When a filesystem decrements i_nlink to zero, it means that a write must be
performed in order to drop the inode from the filesystem.
We're shortly going to have keep filesystems from being remounted r/o between
the time that this i_nlink decrement and that write occurs.
So, add a little helper function to do the decrements. We'll tie into it in a
bit to note when i_nlink hits zero.
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/shmem.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/mm/shmem.c b/mm/shmem.c index b96de69f236b..908dd947b1ea 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -1772,7 +1772,7 @@ static int shmem_unlink(struct inode *dir, struct dentry *dentry) dir->i_size -= BOGO_DIRENT_SIZE; inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME; - inode->i_nlink--; + drop_nlink(inode); dput(dentry); /* Undo the count from "create" - this does all the work */ return 0; } @@ -1782,8 +1782,8 @@ static int shmem_rmdir(struct inode *dir, struct dentry *dentry) if (!simple_empty(dentry)) return -ENOTEMPTY; - dentry->d_inode->i_nlink--; - dir->i_nlink--; + drop_nlink(dentry->d_inode); + drop_nlink(dir); return shmem_unlink(dir, dentry); } @@ -1804,9 +1804,9 @@ static int shmem_rename(struct inode *old_dir, struct dentry *old_dentry, struct if (new_dentry->d_inode) { (void) shmem_unlink(new_dir, new_dentry); if (they_are_dirs) - old_dir->i_nlink--; + drop_nlink(old_dir); } else if (they_are_dirs) { - old_dir->i_nlink--; + drop_nlink(old_dir); new_dir->i_nlink++; } |