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authorRichard Weinberger <richard@nod.at>2017-05-17 00:20:27 +0200
committerRichard Weinberger <richard@nod.at>2017-07-14 22:49:04 +0200
commit272eda8298dc82eb411ece82bbb2c62911087b24 (patch)
tree5772eeddfafe6006785b13774dc221f92403b4b1 /fs/ubifs/xattr.c
parentubifs: Unexport ubifs_inode_slab (diff)
downloadlinux-272eda8298dc82eb411ece82bbb2c62911087b24.tar.xz
linux-272eda8298dc82eb411ece82bbb2c62911087b24.zip
ubifs: Correctly evict xattr inodes
UBIFS handles extended attributes just like files, as consequence of that, they also have inodes. Therefore UBIFS does all the inode machinery also for xattrs. Since new inodes have i_nlink of 1, a file or xattr inode will be evicted if i_nlink goes down to 0 after an unlink. UBIFS assumes this model also for xattrs, which is not correct. One can create a file "foo" with xattr "user.test". By reading "user.test" an inode will be created, and by deleting "user.test" it will get evicted later. The assumption breaks if the file "foo", which hosts the xattrs, will be removed. VFS nor UBIFS does not remove each xattr via ubifs_xattr_remove(), it just removes the host inode from the TNC and all underlying xattr nodes too and the inode will remain in the cache and wastes memory. To solve this problem, remove xattr inodes from the VFS inode cache in ubifs_xattr_remove() to make sure that they get evicted. Fixes: 1e51764a3c2ac05a ("UBIFS: add new flash file system") Cc: <stable@vger.kernel.org> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to '')
-rw-r--r--fs/ubifs/xattr.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/fs/ubifs/xattr.c b/fs/ubifs/xattr.c
index 6c9e62c2ef55..98f11257d66c 100644
--- a/fs/ubifs/xattr.c
+++ b/fs/ubifs/xattr.c
@@ -513,6 +513,28 @@ out_cancel:
return err;
}
+/**
+ * ubifs_evict_xattr_inode - Evict an xattr inode.
+ * @c: UBIFS file-system description object
+ * @xattr_inum: xattr inode number
+ *
+ * When an inode that hosts xattrs is being removed we have to make sure
+ * that cached inodes of the xattrs also get removed from the inode cache
+ * otherwise we'd waste memory. This function looks up an inode from the
+ * inode cache and clears the link counter such that iput() will evict
+ * the inode.
+ */
+void ubifs_evict_xattr_inode(struct ubifs_info *c, ino_t xattr_inum)
+{
+ struct inode *inode;
+
+ inode = ilookup(c->vfs_sb, xattr_inum);
+ if (inode) {
+ clear_nlink(inode);
+ iput(inode);
+ }
+}
+
static int ubifs_xattr_remove(struct inode *host, const char *name)
{
struct inode *inode;