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authorLinus Torvalds <torvalds@linux-foundation.org>2022-07-15 10:27:28 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2022-07-15 10:27:28 -0700
commit1ce9d792e8ef286ed03b151b9bdfcd921e04a988 (patch)
treec54f990d7b34c0e99f979593ec912f9d0dcb8edc /fs
parent8006112d6c4137bc48ca723261198c63d9e6d38a (diff)
parentfac47b43c760ea90e64b895dba60df0327be7775 (diff)
downloadlinux-1ce9d792e8ef286ed03b151b9bdfcd921e04a988.tar.bz2
Merge tag 'ceph-for-5.19-rc7' of https://github.com/ceph/ceph-client
Pull ceph fix from Ilya Dryomov: "A folio locking fixup that Xiubo and David cooperated on, marked for stable. Most of it is in netfs but I picked it up into ceph tree on agreement with David" * tag 'ceph-for-5.19-rc7' of https://github.com/ceph/ceph-client: netfs: do not unlock and put the folio twice
Diffstat (limited to 'fs')
-rw-r--r--fs/afs/file.c2
-rw-r--r--fs/ceph/addr.c11
-rw-r--r--fs/netfs/buffered_read.c17
3 files changed, 17 insertions, 13 deletions
diff --git a/fs/afs/file.c b/fs/afs/file.c
index 42118a4f3383..d1cfb235c4b9 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -375,7 +375,7 @@ static int afs_begin_cache_operation(struct netfs_io_request *rreq)
}
static int afs_check_write_begin(struct file *file, loff_t pos, unsigned len,
- struct folio *folio, void **_fsdata)
+ struct folio **foliop, void **_fsdata)
{
struct afs_vnode *vnode = AFS_FS_I(file_inode(file));
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 6dee88815491..d6e5916138e4 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -63,7 +63,7 @@
(CONGESTION_ON_THRESH(congestion_kb) >> 2))
static int ceph_netfs_check_write_begin(struct file *file, loff_t pos, unsigned int len,
- struct folio *folio, void **_fsdata);
+ struct folio **foliop, void **_fsdata);
static inline struct ceph_snap_context *page_snap_context(struct page *page)
{
@@ -1288,18 +1288,19 @@ ceph_find_incompatible(struct page *page)
}
static int ceph_netfs_check_write_begin(struct file *file, loff_t pos, unsigned int len,
- struct folio *folio, void **_fsdata)
+ struct folio **foliop, void **_fsdata)
{
struct inode *inode = file_inode(file);
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_snap_context *snapc;
- snapc = ceph_find_incompatible(folio_page(folio, 0));
+ snapc = ceph_find_incompatible(folio_page(*foliop, 0));
if (snapc) {
int r;
- folio_unlock(folio);
- folio_put(folio);
+ folio_unlock(*foliop);
+ folio_put(*foliop);
+ *foliop = NULL;
if (IS_ERR(snapc))
return PTR_ERR(snapc);
diff --git a/fs/netfs/buffered_read.c b/fs/netfs/buffered_read.c
index 42f892c5712e..0ce535852151 100644
--- a/fs/netfs/buffered_read.c
+++ b/fs/netfs/buffered_read.c
@@ -319,8 +319,9 @@ zero_out:
* conflicting writes once the folio is grabbed and locked. It is passed a
* pointer to the fsdata cookie that gets returned to the VM to be passed to
* write_end. It is permitted to sleep. It should return 0 if the request
- * should go ahead; unlock the folio and return -EAGAIN to cause the folio to
- * be regot; or return an error.
+ * should go ahead or it may return an error. It may also unlock and put the
+ * folio, provided it sets ``*foliop`` to NULL, in which case a return of 0
+ * will cause the folio to be re-got and the process to be retried.
*
* The calling netfs must initialise a netfs context contiguous to the vfs
* inode before calling this.
@@ -348,13 +349,13 @@ retry:
if (ctx->ops->check_write_begin) {
/* Allow the netfs (eg. ceph) to flush conflicts. */
- ret = ctx->ops->check_write_begin(file, pos, len, folio, _fsdata);
+ ret = ctx->ops->check_write_begin(file, pos, len, &folio, _fsdata);
if (ret < 0) {
trace_netfs_failure(NULL, NULL, ret, netfs_fail_check_write_begin);
- if (ret == -EAGAIN)
- goto retry;
goto error;
}
+ if (!folio)
+ goto retry;
}
if (folio_test_uptodate(folio))
@@ -416,8 +417,10 @@ have_folio_no_wait:
error_put:
netfs_put_request(rreq, false, netfs_rreq_trace_put_failed);
error:
- folio_unlock(folio);
- folio_put(folio);
+ if (folio) {
+ folio_unlock(folio);
+ folio_put(folio);
+ }
_leave(" = %d", ret);
return ret;
}