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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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10
fs/cifs/inode.c
View File

@@ -590,7 +590,7 @@ int cifs_unlink(struct inode *inode, struct dentry *direntry)
if (!rc) {
if (direntry->d_inode)
direntry->d_inode->i_nlink--;
drop_nlink(direntry->d_inode);
} else if (rc == -ENOENT) {
d_drop(direntry);
} else if (rc == -ETXTBSY) {
@@ -609,7 +609,7 @@ int cifs_unlink(struct inode *inode, struct dentry *direntry)
CIFS_MOUNT_MAP_SPECIAL_CHR);
CIFSSMBClose(xid, pTcon, netfid);
if (direntry->d_inode)
direntry->d_inode->i_nlink--;
drop_nlink(direntry->d_inode);
}
} else if (rc == -EACCES) {
/* try only if r/o attribute set in local lookup data? */
@@ -663,7 +663,7 @@ int cifs_unlink(struct inode *inode, struct dentry *direntry)
CIFS_MOUNT_MAP_SPECIAL_CHR);
if (!rc) {
if (direntry->d_inode)
direntry->d_inode->i_nlink--;
drop_nlink(direntry->d_inode);
} else if (rc == -ETXTBSY) {
int oplock = FALSE;
__u16 netfid;
@@ -684,7 +684,7 @@ int cifs_unlink(struct inode *inode, struct dentry *direntry)
CIFS_MOUNT_MAP_SPECIAL_CHR);
CIFSSMBClose(xid, pTcon, netfid);
if (direntry->d_inode)
direntry->d_inode->i_nlink--;
drop_nlink(direntry->d_inode);
}
/* BB if rc = -ETXTBUSY goto the rename logic BB */
}
@@ -816,7 +816,7 @@ int cifs_rmdir(struct inode *inode, struct dentry *direntry)
cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
if (!rc) {
inode->i_nlink--;
drop_nlink(inode);
i_size_write(direntry->d_inode,0);
direntry->d_inode->i_nlink = 0;
}