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cachefiles: perform test on s_blocksize when opening cache file. 

cachefiles requires that s_blocksize in the cache is not greater than
PAGE_SIZE, and performs the check every time a block is accessed.

Move the test to the place where the file is "opened", where other
file-validity tests are performed.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
NeilBrown 2015-11-04 15:20:34 +00:00 committed by Al Viro
parent b130ed5998
commit 95201a4060
2 changed files with 2 additions and 6 deletions
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2
fs/cachefiles/namei.c
View File

@ -655,6 +655,8 @@ lookup_again:
aops = d_backing_inode(object->dentry)->i_mapping->a_ops;
if (!aops->bmap)
goto check_error;
if (object->dentry->d_sb->s_blocksize > PAGE_SIZE)
goto check_error;
object->backer = object->dentry;
} else {

6
fs/cachefiles/rdwr.c
View File

@ -414,9 +414,6 @@ int cachefiles_read_or_alloc_page(struct fscache_retrieval *op,
ASSERT(inode->i_mapping->a_ops->readpages);
/* calculate the shift required to use bmap */
if (inode->i_sb->s_blocksize > PAGE_SIZE)
goto enobufs;
shift = PAGE_SHIFT - inode->i_sb->s_blocksize_bits;
op->op.flags &= FSCACHE_OP_KEEP_FLAGS;
@ -711,9 +708,6 @@ int cachefiles_read_or_alloc_pages(struct fscache_retrieval *op,
ASSERT(inode->i_mapping->a_ops->readpages);
/* calculate the shift required to use bmap */
if (inode->i_sb->s_blocksize > PAGE_SIZE)
goto all_enobufs;
shift = PAGE_SHIFT - inode->i_sb->s_blocksize_bits;
pagevec_init(&pagevec, 0);