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ceph fscache page locking fix from Zheng, marked for stable.

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Merge tag 'ceph-for-4.13-rc8' of git://github.com/ceph/ceph-client

Pull ceph fix from Ilya Dryomov:
 "ceph fscache page locking fix from Zheng, marked for stable"

* tag 'ceph-for-4.13-rc8' of git://github.com/ceph/ceph-client:
  ceph: fix readpage from fscache
This commit is contained in:
Linus Torvalds 2017-09-01 12:46:30 -07:00
commit b8a78bb4d1
2 changed files with 18 additions and 18 deletions
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24
fs/ceph/addr.c
View File

@ -189,7 +189,7 @@ static int ceph_releasepage(struct page *page, gfp_t g)
/*
* read a single page, without unlocking it.
*/
static int readpage_nounlock(struct file *filp, struct page *page)
static int ceph_do_readpage(struct file *filp, struct page *page)
{
struct inode *inode = file_inode(filp);
struct ceph_inode_info *ci = ceph_inode(inode);
@ -219,7 +219,7 @@ static int readpage_nounlock(struct file *filp, struct page *page)
err = ceph_readpage_from_fscache(inode, page);
if (err == 0)
goto out;
return -EINPROGRESS;
dout("readpage inode %p file %p page %p index %lu\n",
inode, filp, page, page->index);
@ -249,8 +249,11 @@ static int readpage_nounlock(struct file *filp, struct page *page)
static int ceph_readpage(struct file *filp, struct page *page)
{
int r = readpage_nounlock(filp, page);
unlock_page(page);
int r = ceph_do_readpage(filp, page);
if (r != -EINPROGRESS)
unlock_page(page);
else
r = 0;
return r;
}
@ -1237,7 +1240,7 @@ static int ceph_update_writeable_page(struct file *file,
goto retry_locked;
r = writepage_nounlock(page, NULL);
if (r < 0)
goto fail_nosnap;
goto fail_unlock;
goto retry_locked;
}
@ -1265,11 +1268,14 @@ static int ceph_update_writeable_page(struct file *file,
}
/* we need to read it. */
r = readpage_nounlock(file, page);
if (r < 0)
goto fail_nosnap;
r = ceph_do_readpage(file, page);
if (r < 0) {
if (r == -EINPROGRESS)
return -EAGAIN;
goto fail_unlock;
}
goto retry_locked;
fail_nosnap:
fail_unlock:
unlock_page(page);
return r;
}

12
fs/ceph/cache.c
View File

@ -297,13 +297,7 @@ void ceph_fscache_file_set_cookie(struct inode *inode, struct file *filp)
}
}
static void ceph_vfs_readpage_complete(struct page *page, void *data, int error)
{
if (!error)
SetPageUptodate(page);
}
static void ceph_vfs_readpage_complete_unlock(struct page *page, void *data, int error)
static void ceph_readpage_from_fscache_complete(struct page *page, void *data, int error)
{
if (!error)
SetPageUptodate(page);
@ -331,7 +325,7 @@ int ceph_readpage_from_fscache(struct inode *inode, struct page *page)
return -ENOBUFS;
ret = fscache_read_or_alloc_page(ci->fscache, page,
ceph_vfs_readpage_complete, NULL,
ceph_readpage_from_fscache_complete, NULL,
GFP_KERNEL);
switch (ret) {
@ -360,7 +354,7 @@ int ceph_readpages_from_fscache(struct inode *inode,
return -ENOBUFS;
ret = fscache_read_or_alloc_pages(ci->fscache, mapping, pages, nr_pages,
ceph_vfs_readpage_complete_unlock,
ceph_readpage_from_fscache_complete,
NULL, mapping_gfp_mask(mapping));
switch (ret) {