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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 <[email protected]>
Acked-by: Christoph Hellwig <[email protected]>
Cc: Al Viro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Dave Hansen 2006-09-30 23:29:03 -07:00 • committed by Linus Torvalds
commit 9a53c3a783
28 changed files with 83 additions and 93 deletions
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18
fs/udf/namei.c
View file

@ -878,8 +878,7 @@ static int udf_rmdir(struct inode * dir, struct dentry * dentry)
inode->i_nlink);
inode->i_nlink = 0;
inode->i_size = 0;
mark_inode_dirty(inode);
dir->i_nlink --;
inode_dec_link_count(inode);
inode->i_ctime = dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
mark_inode_dirty(dir);
@ -923,8 +922,7 @@ static int udf_unlink(struct inode * dir, struct dentry * dentry)
goto end_unlink;
dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
mark_inode_dirty(dir);
inode->i_nlink--;
mark_inode_dirty(inode);
inode_dec_link_count(inode);
inode->i_ctime = dir->i_ctime;
retval = 0;
@ -1101,8 +1099,7 @@ out:
return err;
out_no_entry:
inode->i_nlink--;
mark_inode_dirty(inode);
inode_dec_link_count(inode);
iput(inode);
goto out;
}
@ -1261,9 +1258,8 @@ static int udf_rename (struct inode * old_dir, struct dentry * old_dentry,
if (new_inode)
{
new_inode->i_nlink--;
new_inode->i_ctime = current_fs_time(new_inode->i_sb);
mark_inode_dirty(new_inode);
inode_dec_link_count(new_inode);
}
old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
mark_inode_dirty(old_dir);
@ -1279,12 +1275,10 @@ static int udf_rename (struct inode * old_dir, struct dentry * old_dentry,
}
else
mark_buffer_dirty_inode(dir_bh, old_inode);
old_dir->i_nlink --;
mark_inode_dirty(old_dir);
inode_dec_link_count(old_dir);
if (new_inode)
{
new_inode->i_nlink --;
mark_inode_dirty(new_inode);
inode_dec_link_count(new_inode);
}
else
{