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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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fs/msdos/namei.c
+4 -5
View File
@@ -343,7 +343,7 @@ static int msdos_rmdir(struct inode *dir, struct dentry *dentry)
err = fat_remove_entries(dir, &sinfo); /* and releases bh */
if (err)
goto out;
dir->i_nlink--;
drop_nlink(dir);
inode->i_nlink = 0;
inode->i_ctime = CURRENT_TIME_SEC;
@@ -549,7 +549,7 @@ static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name,
if (err)
goto error_dotdot;
}
old_dir->i_nlink--;
drop_nlink(old_dir);
if (!new_inode)
new_dir->i_nlink++;
}
@@ -566,10 +566,9 @@ static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name,
mark_inode_dirty(old_dir);
if (new_inode) {
drop_nlink(new_inode);
if (is_dir)
new_inode->i_nlink -= 2;
else
new_inode->i_nlink--;
drop_nlink(new_inode);
new_inode->i_ctime = ts;
}
out: