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[PATCH] r/o bind mounts: unlink: monitor i_nlink

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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>
This commit is contained in:
Dave Hansen
2006-09-30 23:29:03 -07:00
committed by Linus Torvalds
parent aab520e2f6
commit 9a53c3a783
28 changed files with 83 additions and 93 deletions
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9
fs/bfs/dir.c
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@ -117,8 +117,7 @@ static int bfs_create(struct inode * dir, struct dentry * dentry, int mode,
err = bfs_add_entry(dir, dentry->d_name.name, dentry->d_name.len, inode->i_ino);
if (err) {
inode->i_nlink--;
mark_inode_dirty(inode);
inode_dec_link_count(inode);
iput(inode);
unlock_kernel();
return err;
@ -196,9 +195,8 @@ static int bfs_unlink(struct inode * dir, struct dentry * dentry)
mark_buffer_dirty(bh);
dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
mark_inode_dirty(dir);
inode->i_nlink--;
inode->i_ctime = dir->i_ctime;
mark_inode_dirty(inode);
inode_dec_link_count(inode);
error = 0;
out_brelse:
@ -249,9 +247,8 @@ static int bfs_rename(struct inode * old_dir, struct dentry * old_dentry,
old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC;
mark_inode_dirty(old_dir);
if (new_inode) {
new_inode->i_nlink--;
new_inode->i_ctime = CURRENT_TIME_SEC;
mark_inode_dirty(new_inode);
inode_dec_link_count(new_inode);
}
mark_buffer_dirty(old_bh);
error = 0;