diff options
| author | David Howells | 2021-11-18 08:58:08 +0000 |
|---|---|---|
| committer | David Howells | 2022-01-07 13:42:29 +0000 |
| commit | 169379eaef933ca98c279257cacb313a02f9984d (patch) | |
| tree | f6f4ebe27265f948217b25a3adde5685f90d4806 /fs | |
| parent | 72b957856b0c09eee542afcff29705dd0adda654 (diff) | |
cachefiles: Mark a backing file in use with an inode flag
Use an inode flag, S_KERNEL_FILE, to mark that a backing file is in use by
the kernel to prevent cachefiles or other kernel services from interfering
with that file.
Using S_SWAPFILE instead isn't really viable as that has other effects in
the I/O paths.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
Link: https://lore.kernel.org/r/163819642273.215744.6414248677118690672.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/163906943215.143852.16972351425323967014.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163967154118.1823006.13227551961786743991.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/164021541207.640689.564689725898537127.stgit@warthog.procyon.org.uk/ # v4
Link: https://lore.kernel.org/r/164021552299.640689.10578652796777392062.stgit@warthog.procyon.org.uk/ # v4
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/cachefiles/internal.h | 2 | ||||
| -rw-r--r-- | fs/cachefiles/namei.c | 35 |
2 files changed, 37 insertions, 0 deletions
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h index 01071e7a7c02..7c67a70a3dff 100644 --- a/fs/cachefiles/internal.h +++ b/fs/cachefiles/internal.h @@ -187,6 +187,8 @@ extern struct kmem_cache *cachefiles_object_jar; /* * namei.c */ +extern void cachefiles_unmark_inode_in_use(struct cachefiles_object *object, + struct file *file); extern struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache, struct dentry *dir, const char *name, diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c index 11a33209ab5f..db60a671c3fc 100644 --- a/fs/cachefiles/namei.c +++ b/fs/cachefiles/namei.c @@ -31,6 +31,18 @@ static bool __cachefiles_mark_inode_in_use(struct cachefiles_object *object, return can_use; } +static bool cachefiles_mark_inode_in_use(struct cachefiles_object *object, + struct dentry *dentry) +{ + struct inode *inode = d_backing_inode(dentry); + bool can_use; + + inode_lock(inode); + can_use = __cachefiles_mark_inode_in_use(object, dentry); + inode_unlock(inode); + return can_use; +} + /* * Unmark a backing inode. The caller must hold the inode lock. */ @@ -44,6 +56,29 @@ static void __cachefiles_unmark_inode_in_use(struct cachefiles_object *object, } /* + * Unmark a backing inode and tell cachefilesd that there's something that can + * be culled. + */ +void cachefiles_unmark_inode_in_use(struct cachefiles_object *object, + struct file *file) +{ + struct cachefiles_cache *cache = object->volume->cache; + struct inode *inode = file_inode(file); + + if (inode) { + inode_lock(inode); + __cachefiles_unmark_inode_in_use(object, file->f_path.dentry); + inode_unlock(inode); + + if (!test_bit(CACHEFILES_OBJECT_USING_TMPFILE, &object->flags)) { + atomic_long_add(inode->i_blocks, &cache->b_released); + if (atomic_inc_return(&cache->f_released)) + cachefiles_state_changed(cache); + } + } +} + +/* * get a subdirectory */ struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache, |