From: Steve French stfrench@microsoft.com
commit 65af8f0166f4d15e61c63db498ec7981acdd897f upstream.
Applications that create and extend and write to a file do not expect to see 0 allocation size. When file is extended, set its allocation size to a plausible value until we have a chance to query the server for it. When the file is cached this will prevent showing an impossible number of allocated blocks (like 0). This fixes e.g. xfstests 614 which does
1) create a file and set its size to 64K 2) mmap write 64K to the file 3) stat -c %b for the file (to query the number of allocated blocks)
It was failing because we returned 0 blocks. Even though we would return the correct cached file size, we returned an impossible allocation size.
Signed-off-by: Steve French stfrench@microsoft.com CC: stable@vger.kernel.org Reviewed-by: Aurelien Aptel aaptel@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/cifs/inode.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
--- a/fs/cifs/inode.c +++ b/fs/cifs/inode.c @@ -2375,7 +2375,7 @@ int cifs_getattr(const struct path *path * We need to be sure that all dirty pages are written and the server * has actual ctime, mtime and file length. */ - if ((request_mask & (STATX_CTIME | STATX_MTIME | STATX_SIZE)) && + if ((request_mask & (STATX_CTIME | STATX_MTIME | STATX_SIZE | STATX_BLOCKS)) && !CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping && inode->i_mapping->nrpages != 0) { rc = filemap_fdatawait(inode->i_mapping); @@ -2565,6 +2565,14 @@ set_size_out: if (rc == 0) { cifsInode->server_eof = attrs->ia_size; cifs_setsize(inode, attrs->ia_size); + /* + * i_blocks is not related to (i_size / i_blksize), but instead + * 512 byte (2**9) size is required for calculating num blocks. + * Until we can query the server for actual allocation size, + * this is best estimate we have for blocks allocated for a file + * Number of blocks must be rounded up so size 1 is not 0 blocks + */ + inode->i_blocks = (512 - 1 + attrs->ia_size) >> 9;
/* * The man page of truncate says if the size changed,