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authorJeffle Xu <jefflexu@linux.alibaba.com>2022-04-25 14:21:23 +0200
committerGao Xiang <hsiangkao@linux.alibaba.com>2022-05-17 18:11:17 +0200
commita06fac1599c179853639491974fd72aefd46d030 (patch)
tree1c1e4098f68255f8105e6c15ff8e3f49a44a4a01 /fs/cachefiles
parenterofs: support idmapped mounts (diff)
downloadlinux-a06fac1599c179853639491974fd72aefd46d030.tar.xz
linux-a06fac1599c179853639491974fd72aefd46d030.zip
cachefiles: extract write routine
Extract the generic routine of writing data to cache files, and make it generally available. This will be used by the following patch implementing on-demand read mode. Since it's called inside CacheFiles module, make the interface generic and unrelated to netfs_cache_resources. It is worth noting that, ki->inval_counter is not initialized after this cleanup. It shall not make any visible difference, since inval_counter is no longer used in the write completion routine, i.e. cachefiles_write_complete(). Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com> Acked-by: David Howells <dhowells@redhat.com> Link: https://lore.kernel.org/r/20220425122143.56815-2-jefflexu@linux.alibaba.com Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Diffstat (limited to 'fs/cachefiles')
-rw-r--r--fs/cachefiles/internal.h10
-rw-r--r--fs/cachefiles/io.c61
2 files changed, 45 insertions, 26 deletions
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index c793d33b0224..e80673d0ab97 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -201,6 +201,16 @@ extern void cachefiles_put_object(struct cachefiles_object *object,
*/
extern bool cachefiles_begin_operation(struct netfs_cache_resources *cres,
enum fscache_want_state want_state);
+extern int __cachefiles_prepare_write(struct cachefiles_object *object,
+ struct file *file,
+ loff_t *_start, size_t *_len,
+ bool no_space_allocated_yet);
+extern int __cachefiles_write(struct cachefiles_object *object,
+ struct file *file,
+ loff_t start_pos,
+ struct iov_iter *iter,
+ netfs_io_terminated_t term_func,
+ void *term_func_priv);
/*
* key.c
diff --git a/fs/cachefiles/io.c b/fs/cachefiles/io.c
index 9dc81e781f2b..50a14e8f0aac 100644
--- a/fs/cachefiles/io.c
+++ b/fs/cachefiles/io.c
@@ -277,36 +277,33 @@ static void cachefiles_write_complete(struct kiocb *iocb, long ret)
/*
* Initiate a write to the cache.
*/
-static int cachefiles_write(struct netfs_cache_resources *cres,
- loff_t start_pos,
- struct iov_iter *iter,
- netfs_io_terminated_t term_func,
- void *term_func_priv)
+int __cachefiles_write(struct cachefiles_object *object,
+ struct file *file,
+ loff_t start_pos,
+ struct iov_iter *iter,
+ netfs_io_terminated_t term_func,
+ void *term_func_priv)
{
- struct cachefiles_object *object;
struct cachefiles_cache *cache;
struct cachefiles_kiocb *ki;
struct inode *inode;
- struct file *file;
unsigned int old_nofs;
- ssize_t ret = -ENOBUFS;
+ ssize_t ret;
size_t len = iov_iter_count(iter);
- if (!fscache_wait_for_operation(cres, FSCACHE_WANT_WRITE))
- goto presubmission_error;
fscache_count_write();
- object = cachefiles_cres_object(cres);
cache = object->volume->cache;
- file = cachefiles_cres_file(cres);
_enter("%pD,%li,%llx,%zx/%llx",
file, file_inode(file)->i_ino, start_pos, len,
i_size_read(file_inode(file)));
- ret = -ENOMEM;
ki = kzalloc(sizeof(struct cachefiles_kiocb), GFP_KERNEL);
- if (!ki)
- goto presubmission_error;
+ if (!ki) {
+ if (term_func)
+ term_func(term_func_priv, -ENOMEM, false);
+ return -ENOMEM;
+ }
refcount_set(&ki->ki_refcnt, 2);
ki->iocb.ki_filp = file;
@@ -314,7 +311,6 @@ static int cachefiles_write(struct netfs_cache_resources *cres,
ki->iocb.ki_flags = IOCB_DIRECT | IOCB_WRITE;
ki->iocb.ki_ioprio = get_current_ioprio();
ki->object = object;
- ki->inval_counter = cres->inval_counter;
ki->start = start_pos;
ki->len = len;
ki->term_func = term_func;
@@ -369,11 +365,24 @@ in_progress:
cachefiles_put_kiocb(ki);
_leave(" = %zd", ret);
return ret;
+}
-presubmission_error:
- if (term_func)
- term_func(term_func_priv, ret, false);
- return ret;
+static int cachefiles_write(struct netfs_cache_resources *cres,
+ loff_t start_pos,
+ struct iov_iter *iter,
+ netfs_io_terminated_t term_func,
+ void *term_func_priv)
+{
+ if (!fscache_wait_for_operation(cres, FSCACHE_WANT_WRITE)) {
+ if (term_func)
+ term_func(term_func_priv, -ENOBUFS, false);
+ return -ENOBUFS;
+ }
+
+ return __cachefiles_write(cachefiles_cres_object(cres),
+ cachefiles_cres_file(cres),
+ start_pos, iter,
+ term_func, term_func_priv);
}
/*
@@ -484,13 +493,12 @@ out_no_object:
/*
* Prepare for a write to occur.
*/
-static int __cachefiles_prepare_write(struct netfs_cache_resources *cres,
- loff_t *_start, size_t *_len, loff_t i_size,
- bool no_space_allocated_yet)
+int __cachefiles_prepare_write(struct cachefiles_object *object,
+ struct file *file,
+ loff_t *_start, size_t *_len,
+ bool no_space_allocated_yet)
{
- struct cachefiles_object *object = cachefiles_cres_object(cres);
struct cachefiles_cache *cache = object->volume->cache;
- struct file *file = cachefiles_cres_file(cres);
loff_t start = *_start, pos;
size_t len = *_len, down;
int ret;
@@ -577,7 +585,8 @@ static int cachefiles_prepare_write(struct netfs_cache_resources *cres,
}
cachefiles_begin_secure(cache, &saved_cred);
- ret = __cachefiles_prepare_write(cres, _start, _len, i_size,
+ ret = __cachefiles_prepare_write(object, cachefiles_cres_file(cres),
+ _start, _len,
no_space_allocated_yet);
cachefiles_end_secure(cache, saved_cred);
return ret;