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authorLinus Torvalds <torvalds@linux-foundation.org>2018-01-03 10:58:56 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-01-03 10:58:56 -0800
commit50d0f78f5c736e974188d72bf9317971e37e69b0 (patch)
tree1f830d8b20238a888201bdb9cf4c6b4f3790e26e /fs
parentb4df268dd4031fd2f8729e7650bc516a0a5f315b (diff)
parentafae457d874860a7e299d334f59eede5f3ad4b47 (diff)
Merge branch 'afs-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
Pull afs/fscache fixes from David Howells: - Fix the default return of fscache_maybe_release_page() when a cache isn't in use - it prevents a filesystem from releasing pages. This can cause a system to OOM. - Fix a potential uninitialised variable in AFS. - Fix AFS unlink's handling of the nlink count. It needs to use the nlink manipulation functions so that inode structs of deleted inodes actually get scheduled for destruction. - Fix error handling in afs_write_end() so that the page gets unlocked and put if we can't fill the unwritten portion. * 'afs-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs: afs: Fix missing error handling in afs_write_end() afs: Fix unlink afs: Potential uninitialized variable in afs_extract_data() fscache: Fix the default for fscache_maybe_release_page()
Diffstat (limited to 'fs')
-rw-r--r--fs/afs/dir.c37
-rw-r--r--fs/afs/inode.c4
-rw-r--r--fs/afs/rxrpc.c2
-rw-r--r--fs/afs/write.c8
4 files changed, 39 insertions, 12 deletions
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index ff8d5bf4354f..23c7f395d718 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -895,20 +895,38 @@ error:
* However, if we didn't have a callback promise outstanding, or it was
* outstanding on a different server, then it won't break it either...
*/
-static int afs_dir_remove_link(struct dentry *dentry, struct key *key)
+static int afs_dir_remove_link(struct dentry *dentry, struct key *key,
+ unsigned long d_version_before,
+ unsigned long d_version_after)
{
+ bool dir_valid;
int ret = 0;
+ /* There were no intervening changes on the server if the version
+ * number we got back was incremented by exactly 1.
+ */
+ dir_valid = (d_version_after == d_version_before + 1);
+
if (d_really_is_positive(dentry)) {
struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
- if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
- kdebug("AFS_VNODE_DELETED");
- clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
-
- ret = afs_validate(vnode, key);
- if (ret == -ESTALE)
+ if (dir_valid) {
+ drop_nlink(&vnode->vfs_inode);
+ if (vnode->vfs_inode.i_nlink == 0) {
+ set_bit(AFS_VNODE_DELETED, &vnode->flags);
+ clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
+ }
ret = 0;
+ } else {
+ clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
+
+ if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
+ kdebug("AFS_VNODE_DELETED");
+
+ ret = afs_validate(vnode, key);
+ if (ret == -ESTALE)
+ ret = 0;
+ }
_debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret);
}
@@ -923,6 +941,7 @@ static int afs_unlink(struct inode *dir, struct dentry *dentry)
struct afs_fs_cursor fc;
struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
struct key *key;
+ unsigned long d_version = (unsigned long)dentry->d_fsdata;
int ret;
_enter("{%x:%u},{%pd}",
@@ -955,7 +974,9 @@ static int afs_unlink(struct inode *dir, struct dentry *dentry)
afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
ret = afs_end_vnode_operation(&fc);
if (ret == 0)
- ret = afs_dir_remove_link(dentry, key);
+ ret = afs_dir_remove_link(
+ dentry, key, d_version,
+ (unsigned long)dvnode->status.data_version);
}
error_key:
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index 3415eb7484f6..1e81864ef0b2 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -377,6 +377,10 @@ int afs_validate(struct afs_vnode *vnode, struct key *key)
}
read_sequnlock_excl(&vnode->cb_lock);
+
+ if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
+ clear_nlink(&vnode->vfs_inode);
+
if (valid)
goto valid;
diff --git a/fs/afs/rxrpc.c b/fs/afs/rxrpc.c
index ea1460b9b71a..e1126659f043 100644
--- a/fs/afs/rxrpc.c
+++ b/fs/afs/rxrpc.c
@@ -885,7 +885,7 @@ int afs_extract_data(struct afs_call *call, void *buf, size_t count,
{
struct afs_net *net = call->net;
enum afs_call_state state;
- u32 remote_abort;
+ u32 remote_abort = 0;
int ret;
_enter("{%s,%zu},,%zu,%d",
diff --git a/fs/afs/write.c b/fs/afs/write.c
index cb5f8a3df577..9370e2feb999 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -198,7 +198,7 @@ int afs_write_end(struct file *file, struct address_space *mapping,
ret = afs_fill_page(vnode, key, pos + copied,
len - copied, page);
if (ret < 0)
- return ret;
+ goto out;
}
SetPageUptodate(page);
}
@@ -206,10 +206,12 @@ int afs_write_end(struct file *file, struct address_space *mapping,
set_page_dirty(page);
if (PageDirty(page))
_debug("dirtied");
+ ret = copied;
+
+out:
unlock_page(page);
put_page(page);
-
- return copied;
+ return ret;
}
/*