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linux-stable/fs/cifs
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Steve French 3d1a3745d8 Add sparse file support to SMB2/SMB3 mounts 
Many Linux filesystes make a file "sparse" when extending
a file with ftruncate. This does work for CIFS to Samba
(only) but not for SMB2/SMB3 (to Samba or Windows) since
there is a "set sparse" fsctl which is supposed to be
sent to mark a file as sparse.

This patch marks a file as sparse by sending this simple
set sparse fsctl if it is extended more than 2 pages.
It has been tested to Windows 8.1, Samba and various
SMB2/SMB3 servers which do support setting sparse (and
MacOS which does not appear to support the fsctl yet).
If a server share does not support setting a file
as sparse, then we do not retry setting sparse on that
share.

The disk space savings for sparse files can be quite
large (even more significant on Windows servers than Samba).

Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Shirish Pargaonkar <spargaonkar@suse.com>
2014-08-13 13:18:35 -05:00
..
asn1.c [CIFS] cifs: Rename cERROR and cFYI to cifs_dbg 2013-05-04 22:17:23 -05:00
cache.c [CIFS] cifs: Rename cERROR and cFYI to cifs_dbg 2013-05-04 22:17:23 -05:00
cifs_debug.c [CIFS] Fix incorrect hex vs. decimal in some debug print statements 2014-08-02 21:16:48 -05:00
cifs_debug.h [CIFS] cifs: Rename cERROR and cFYI to cifs_dbg 2013-05-04 22:17:23 -05:00
cifs_dfs_ref.c cifs: fix composing of mount options for DFS referrals 2013-05-24 13:08:31 -05:00
cifs_fs_sb.h cifs: rcu-delay unload_nls() and freeing sbi 2013-10-24 23:43:27 -04:00
cifs_spnego.c [CIFS] cifs: Rename cERROR and cFYI to cifs_dbg 2013-05-04 22:17:23 -05:00
cifs_spnego.h [CIFS] Rename three structures to avoid camel case 2011-05-27 04:34:02 +00:00
cifs_unicode.c [CIFS] fix mount failure with broken pathnames when smb3 mount with mapchars option 2014-06-24 08:10:24 -05:00
cifs_unicode.h cifs: add new case-insensitive conversion routines that are based on wchar_t's 2013-09-08 14:38:05 -05:00
cifs_uniupr.h cifs: correction of unicode header files 2010-08-20 00:46:42 +00:00
cifsacl.c [CIFS] Fix cifsacl mounts over smb2 to not call cifs 2014-02-10 14:08:16 -06:00
cifsacl.h cifs: fix SID binary to string conversion 2012-12-11 11:48:49 -06:00
cifsencrypt.c cifs: Use data structures to compute NTLMv2 response offsets 2013-11-11 16:58:11 -06:00
cifsfs.c cifs: revalidate mapping prior to satisfying read_iter request with cache=loose 2014-06-19 13:34:04 -05:00
cifsfs.h Update cifs version 2014-08-02 01:23:04 -05:00
cifsglob.h Add sparse file support to SMB2/SMB3 mounts 2014-08-13 13:18:35 -05:00
cifspdu.h Add missing definitions for CIFS File System Attributes 2014-08-12 23:47:14 -05:00
cifsproto.h CIFS: Use multicredits for SMB 2.1/3 writes 2014-08-02 01:23:03 -05:00
cifssmb.c CIFS: Optimize cifs_user_read() in a short read case on reconnects 2014-08-02 01:23:04 -05:00
connect.c Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6 2014-08-09 13:03:34 -07:00
dir.c [CIFS] Fix cifsacl mounts over smb2 to not call cifs 2014-02-10 14:08:16 -06:00
dns_resolve.c cifs: fix composing of mount options for DFS referrals 2013-05-24 13:08:31 -05:00
dns_resolve.h DNS: Separate out CIFS DNS Resolver code 2010-08-05 17:17:51 +00:00
export.c [CIFS] cifs: Rename cERROR and cFYI to cifs_dbg 2013-05-04 22:17:23 -05:00
file.c Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6 2014-08-09 13:03:34 -07:00
fscache.c NFS client updates for Linux 3.13 2013-11-08 05:57:46 +09:00
fscache.h CIFS: FS-Cache: Uncache unread pages in cifs_readpages() before freeing them 2013-09-18 10:17:03 -05:00
inode.c sched: Allow wait_on_bit_action() functions to support a timeout 2014-07-16 15:10:41 +02:00
ioctl.c fs: cifs: new helper: file_inode(file) 2014-05-21 10:18:05 -07:00
Kconfig [CIFS] SMB3 Signing enablement 2013-06-26 23:45:05 -05:00
link.c fs/cifs: fix regression in cifs_create_mf_symlink() 2014-06-16 13:50:11 -05:00
Makefile cifs: add new case-insensitive conversion routines that are based on wchar_t's 2013-09-08 14:38:05 -05:00
misc.c cifs: remove unused function cifs_oplock_break_wait 2014-08-11 01:31:03 -05:00
netmisc.c fs/cifs/netmisc.c: convert printk to pr_foo() 2014-05-21 10:18:05 -07:00
nterr.c CIFS: Rename 7 error codes to NT_ style 2012-07-24 10:25:10 -05:00
nterr.h CIFS: Rename 7 error codes to NT_ style 2012-07-24 10:25:10 -05:00
ntlmssp.h CIFS: Add session setup/logoff capability for SMB2 2012-07-24 21:54:57 +04:00
readdir.c cifs: Rename MF symlink function names 2014-01-20 00:13:54 -06:00
rfc1002pdu.h
sess.c Remove sparse build warning 2014-08-02 01:23:01 -05:00
smb1ops.c CIFS: Use multicredits for SMB 2.1/3 writes 2014-08-02 01:23:03 -05:00
smb2file.c CIFS: Store lease state itself rather than a mapped oplock value 2013-09-09 22:52:05 -05:00
smb2glob.h CIFS: Fix too big maxBuf size for SMB3 mounts 2014-02-14 16:50:47 -06:00
smb2inode.c Add worker function to set allocation size 2014-08-05 12:53:37 -05:00
smb2maperror.c CIFS: Fix STATUS_CANNOT_DELETE error mapping for SMB2 2014-08-02 01:23:04 -05:00
smb2misc.c [CIFS] Fix incorrect hex vs. decimal in some debug print statements 2014-08-02 21:16:48 -05:00
smb2ops.c Add sparse file support to SMB2/SMB3 mounts 2014-08-13 13:18:35 -05:00
smb2pdu.c Add sparse file support to SMB2/SMB3 mounts 2014-08-13 13:18:35 -05:00
smb2pdu.h Clarify SMB2/SMB3 create context and add missing ones 2014-05-21 10:18:06 -07:00
smb2proto.h Add worker function to set allocation size 2014-08-05 12:53:37 -05:00
smb2status.h CIFS: Add SMB2 status codes 2012-07-24 10:25:13 -05:00
smb2transport.c CIFS: Use multicredits for SMB 2.1/3 writes 2014-08-02 01:23:03 -05:00
smbencrypt.c [CIFS] cifs: Rename cERROR and cFYI to cifs_dbg 2013-05-04 22:17:23 -05:00
smberr.h cifs: map NT_STATUS_ERROR_WRITE_PROTECTED to -EROFS 2010-08-02 12:40:40 +00:00
smbfsctl.h Check SMB3 dialects against downgrade attacks 2013-11-19 23:52:54 -06:00
transport.c CIFS: Use multicredits for SMB 2.1/3 writes 2014-08-02 01:23:03 -05:00
winucase.c [CIFS] quiet sparse compile warning 2013-09-08 14:54:24 -05:00
xattr.c retrieving CIFS ACLs when mounted with SMB2 fails dropping session 2014-02-07 11:08:17 -06:00