linux.git/fs/nfsd/filecache.c, branch v5.6

nfsd: make nfsd_filecache_wq variable static

2020-02-07T18:30:41+00:00

Fix sparse warning:

fs/nfsd/filecache.c:55:25: warning:
	symbol 'nfsd_filecache_wq' was not declared. Should it be static?

Reported-by: Hulk Robot 
Signed-off-by: Chen Zhou 
Signed-off-by: J. Bruce Fields

nfsd: convert file cache to use over/underflow safe refcount

2020-02-06T16:22:55+00:00

Use the 'refcount_t' type instead of 'atomic_t' for improved
refcounting safety.

Signed-off-by: Trond Myklebust 
Signed-off-by: J. Bruce Fields

nfsd: Fix stable writes

2020-01-22T21:25:40+00:00

Strictly speaking, a stable write error needs to reflect the
write + the commit of that write (and only that write). To
ensure that we don't pick up the write errors from other
writebacks, add a rw_semaphore to provide exclusion.

Signed-off-by: Trond Myklebust 
Signed-off-by: J. Bruce Fields

nfsd: Fix a soft lockup race in nfsd_file_mark_find_or_create()

2020-01-22T21:25:40+00:00

If nfsd_file_mark_find_or_create() keeps winning the race for the
nfsd_file_fsnotify_group->mark_mutex against nfsd_file_mark_put()
then it can soft lock up, since fsnotify_add_inode_mark() ends
up always finding an existing entry.

Signed-off-by: Trond Myklebust 
Signed-off-by: J. Bruce Fields

nfsd: Reduce the number of calls to nfsd_file_gc()

2020-01-22T21:25:40+00:00

Don't call nfsd_file_gc() on every put of the reference in nfsd_file_put().
Instead, do it only when we're expecting the refcount to go to 1.

Signed-off-by: Trond Myklebust 
Signed-off-by: J. Bruce Fields

nfsd: Schedule the laundrette regularly irrespective of file errors

2020-01-22T21:25:40+00:00

Emsure we schedule the laundrette even if the struct file is carrying
file errors.

Signed-off-by: Trond Myklebust 
Signed-off-by: J. Bruce Fields

nfsd: Remove unused constant NFSD_FILE_LRU_RESCAN

2020-01-22T21:25:40+00:00

Signed-off-by: Trond Myklebust 
Signed-off-by: J. Bruce Fields

nfsd: Containerise filecache laundrette

2020-01-22T21:25:40+00:00

Ensure that if the filecache laundrette gets stuck, it only affects
the knfsd instances of one container.

The notifier callbacks can be called from various contexts so avoid
using synchonous filesystem operations that might deadlock.

Signed-off-by: Trond Myklebust 
Signed-off-by: J. Bruce Fields

nfsd: cleanup nfsd_file_lru_dispose()

2020-01-22T21:25:40+00:00

Signed-off-by: Trond Myklebust 
Signed-off-by: J. Bruce Fields

nfsd: fix filecache lookup

2020-01-22T21:25:01+00:00

If the lookup keeps finding a nfsd_file with an unhashed open file,
then retry once only.

Signed-off-by: Trond Myklebust 
Cc: stable@vger.kernel.org
Fixes: 65294c1f2c5e "nfsd: add a new struct file caching facility to nfsd"
Signed-off-by: J. Bruce Fields