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Merge branch 'for-linus' of git://git.samba.org/sfrench/cifs-2.6

Browse Source 
Pull CIFS fixes from Steve French:
 "Small set of cifs fixes.  Most important is Jeff's fix that works
  around disconnection problems which can be caused by simultaneous use
  of user space tools (starting a long running smbclient backup then
  doing a cifs kernel mount) or multiple cifs mounts through a NAT, and
  Jim's fix to deal with reexport of cifs share.

  I expect to send two more cifs fixes next week (being tested now) -
  fixes to address an SMB2 unmount hang when server dies and a fix for
  cifs symlink handling of Windows "NFS" symlinks"

* 'for-linus' of git://git.samba.org/sfrench/cifs-2.6:
  [CIFS] update cifs.ko version
  [CIFS] Remove ext2 flags that have been moved to fs.h
  [CIFS] Provide sane values for nlink
  cifs: stop trying to use virtual circuits
  CIFS: FS-Cache: Uncache unread pages in cifs_readpages() before freeing them
This commit is contained in:
Linus Torvalds 2013-10-04 20:50:16 -07:00
commit a5c984cc29
10 changed files with 74 additions and 115 deletions
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2
fs/cifs/cifsfs.h
View File

@ -132,5 +132,5 @@ extern long cifs_ioctl(struct file *filep, unsigned int cmd, unsigned long arg);
extern const struct export_operations cifs_export_ops;
#endif /* CONFIG_CIFS_NFSD_EXPORT */
#define CIFS_VERSION "2.01"
#define CIFS_VERSION "2.02"
#endif /* _CIFSFS_H */

5
fs/cifs/cifsglob.h
View File

@ -547,9 +547,6 @@ struct TCP_Server_Info {
unsigned int max_rw; /* maxRw specifies the maximum */
/* message size the server can send or receive for */
/* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
unsigned int max_vcs; /* maximum number of smb sessions, at least
those that can be specified uniquely with
vcnumbers */
unsigned int capabilities; /* selective disabling of caps by smb sess */
int timeAdj; /* Adjust for difference in server time zone in sec */
__u64 CurrentMid; /* multiplex id - rotating counter */
@ -715,7 +712,6 @@ struct cifs_ses {
enum statusEnum status;
unsigned overrideSecFlg; /* if non-zero override global sec flags */
__u16 ipc_tid; /* special tid for connection to IPC share */
__u16 vcnum;
char *serverOS; /* name of operating system underlying server */
char *serverNOS; /* name of network operating system of server */
char *serverDomain; /* security realm of server */
@ -1272,6 +1268,7 @@ struct dfs_info3_param {
#define CIFS_FATTR_DELETE_PENDING 0x2
#define CIFS_FATTR_NEED_REVAL 0x4
#define CIFS_FATTR_INO_COLLISION 0x8
#define CIFS_FATTR_UNKNOWN_NLINK 0x10
struct cifs_fattr {
u32 cf_flags;

21
fs/cifs/cifspdu.h
View File

@ -2652,26 +2652,7 @@ typedef struct file_xattr_info {
} __attribute__((packed)) FILE_XATTR_INFO; /* extended attribute info
level 0x205 */
/* flags for chattr command */
#define EXT_SECURE_DELETE 0x00000001 /* EXT3_SECRM_FL */
#define EXT_ENABLE_UNDELETE 0x00000002 /* EXT3_UNRM_FL */
/* Reserved for compress file 0x4 */
#define EXT_SYNCHRONOUS 0x00000008 /* EXT3_SYNC_FL */
#define EXT_IMMUTABLE_FL 0x00000010 /* EXT3_IMMUTABLE_FL */
#define EXT_OPEN_APPEND_ONLY 0x00000020 /* EXT3_APPEND_FL */
#define EXT_DO_NOT_BACKUP 0x00000040 /* EXT3_NODUMP_FL */
#define EXT_NO_UPDATE_ATIME 0x00000080 /* EXT3_NOATIME_FL */
/* 0x100 through 0x800 reserved for compression flags and are GET-ONLY */
#define EXT_HASH_TREE_INDEXED_DIR 0x00001000 /* GET-ONLY EXT3_INDEX_FL */
/* 0x2000 reserved for IMAGIC_FL */
#define EXT_JOURNAL_THIS_FILE 0x00004000 /* GET-ONLY EXT3_JOURNAL_DATA_FL */
/* 0x8000 reserved for EXT3_NOTAIL_FL */
#define EXT_SYNCHRONOUS_DIR 0x00010000 /* EXT3_DIRSYNC_FL */
#define EXT_TOPDIR 0x00020000 /* EXT3_TOPDIR_FL */
#define EXT_SET_MASK 0x000300FF
#define EXT_GET_MASK 0x0003DFFF
/* flags for lsattr and chflags commands removed arein uapi/linux/fs.h */
typedef struct file_chattr_info {
__le64 mask; /* list of all possible attribute bits */

1
fs/cifs/cifssmb.c
View File

@ -463,7 +463,6 @@ decode_lanman_negprot_rsp(struct TCP_Server_Info *server, NEGOTIATE_RSP *pSMBr)
cifs_max_pending);
set_credits(server, server->maxReq);
server->maxBuf = le16_to_cpu(rsp->MaxBufSize);
server->max_vcs = le16_to_cpu(rsp->MaxNumberVcs);
/* even though we do not use raw we might as well set this
accurately, in case we ever find a need for it */
if ((le16_to_cpu(rsp->RawMode) & RAW_ENABLE) == RAW_ENABLE) {

8
fs/cifs/file.c
View File

@ -3254,6 +3254,9 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
/*
* Reads as many pages as possible from fscache. Returns -ENOBUFS
* immediately if the cookie is negative
*
* After this point, every page in the list might have PG_fscache set,
* so we will need to clean that up off of every page we don't use.
*/
rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list,
&num_pages);
@ -3376,6 +3379,11 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
kref_put(&rdata->refcount, cifs_readdata_release);
}
/* Any pages that have been shown to fscache but didn't get added to
* the pagecache must be uncached before they get returned to the
* allocator.
*/
cifs_fscache_readpages_cancel(mapping->host, page_list);
return rc;
}

7
fs/cifs/fscache.c
View File

@ -223,6 +223,13 @@ void __cifs_readpage_to_fscache(struct inode *inode, struct page *page)
fscache_uncache_page(CIFS_I(inode)->fscache, page);
}
void __cifs_fscache_readpages_cancel(struct inode *inode, struct list_head *pages)
{
cifs_dbg(FYI, "%s: (fsc: %p, i: %p)\n",
__func__, CIFS_I(inode)->fscache, inode);
fscache_readpages_cancel(CIFS_I(inode)->fscache, pages);
}
void __cifs_fscache_invalidate_page(struct page *page, struct inode *inode)
{
struct cifsInodeInfo *cifsi = CIFS_I(inode);

13
fs/cifs/fscache.h
View File

@ -54,6 +54,7 @@ extern int __cifs_readpages_from_fscache(struct inode *,
struct address_space *,
struct list_head *,
unsigned *);
extern void __cifs_fscache_readpages_cancel(struct inode *, struct list_head *);
extern void __cifs_readpage_to_fscache(struct inode *, struct page *);
@ -91,6 +92,13 @@ static inline void cifs_readpage_to_fscache(struct inode *inode,
__cifs_readpage_to_fscache(inode, page);
}
static inline void cifs_fscache_readpages_cancel(struct inode *inode,
struct list_head *pages)
{
if (CIFS_I(inode)->fscache)
return __cifs_fscache_readpages_cancel(inode, pages);
}
#else /* CONFIG_CIFS_FSCACHE */
static inline int cifs_fscache_register(void) { return 0; }
static inline void cifs_fscache_unregister(void) {}
@ -131,6 +139,11 @@ static inline int cifs_readpages_from_fscache(struct inode *inode,
static inline void cifs_readpage_to_fscache(struct inode *inode,
struct page *page) {}
static inline void cifs_fscache_readpages_cancel(struct inode *inode,
struct list_head *pages)
{
}
#endif /* CONFIG_CIFS_FSCACHE */
#endif /* _CIFS_FSCACHE_H */

45
fs/cifs/inode.c
View File

@ -120,6 +120,33 @@ cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
cifs_i->invalid_mapping = true;
}
/*
* copy nlink to the inode, unless it wasn't provided. Provide
* sane values if we don't have an existing one and none was provided
*/
static void
cifs_nlink_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
{
/*
* if we're in a situation where we can't trust what we
* got from the server (readdir, some non-unix cases)
* fake reasonable values
*/
if (fattr->cf_flags & CIFS_FATTR_UNKNOWN_NLINK) {
/* only provide fake values on a new inode */
if (inode->i_state & I_NEW) {
if (fattr->cf_cifsattrs & ATTR_DIRECTORY)
set_nlink(inode, 2);
else
set_nlink(inode, 1);
}
return;
}
/* we trust the server, so update it */
set_nlink(inode, fattr->cf_nlink);
}
/* populate an inode with info from a cifs_fattr struct */
void
cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
@ -134,7 +161,7 @@ cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
inode->i_mtime = fattr->cf_mtime;
inode->i_ctime = fattr->cf_ctime;
inode->i_rdev = fattr->cf_rdev;
set_nlink(inode, fattr->cf_nlink);
cifs_nlink_fattr_to_inode(inode, fattr);
inode->i_uid = fattr->cf_uid;
inode->i_gid = fattr->cf_gid;
@ -541,6 +568,7 @@ cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
fattr->cf_createtime = le64_to_cpu(info->CreationTime);
fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
fattr->cf_dtype = DT_DIR;
@ -548,7 +576,8 @@ cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
* Server can return wrong NumberOfLinks value for directories
* when Unix extensions are disabled - fake it.
*/
fattr->cf_nlink = 2;
if (!tcon->unix_ext)
fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
} else if (fattr->cf_cifsattrs & ATTR_REPARSE) {
fattr->cf_mode = S_IFLNK;
fattr->cf_dtype = DT_LNK;
@ -561,11 +590,15 @@ cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
if (fattr->cf_cifsattrs & ATTR_READONLY)
fattr->cf_mode &= ~(S_IWUGO);
fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
if (fattr->cf_nlink < 1) {
cifs_dbg(1, "replacing bogus file nlink value %u\n",
/*
* Don't accept zero nlink from non-unix servers unless
* delete is pending. Instead mark it as unknown.
*/
if ((fattr->cf_nlink < 1) && !tcon->unix_ext &&
!info->DeletePending) {
cifs_dbg(1, "bogus file nlink value %u\n",
fattr->cf_nlink);
fattr->cf_nlink = 1;
fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
}
}

3
fs/cifs/readdir.c
View File

@ -180,6 +180,9 @@ cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
fattr->cf_dtype = DT_REG;
}
/* non-unix readdir doesn't provide nlink */
fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
if (fattr->cf_cifsattrs & ATTR_READONLY)
fattr->cf_mode &= ~S_IWUGO;

84
fs/cifs/sess.c
View File

@ -32,88 +32,6 @@
#include <linux/slab.h>
#include "cifs_spnego.h"
/*
* Checks if this is the first smb session to be reconnected after
* the socket has been reestablished (so we know whether to use vc 0).
* Called while holding the cifs_tcp_ses_lock, so do not block
*/
static bool is_first_ses_reconnect(struct cifs_ses *ses)
{
struct list_head *tmp;
struct cifs_ses *tmp_ses;
list_for_each(tmp, &ses->server->smb_ses_list) {
tmp_ses = list_entry(tmp, struct cifs_ses,
smb_ses_list);
if (tmp_ses->need_reconnect == false)
return false;
}
/* could not find a session that was already connected,
this must be the first one we are reconnecting */
return true;
}
/*
* vc number 0 is treated specially by some servers, and should be the
* first one we request. After that we can use vcnumbers up to maxvcs,
* one for each smb session (some Windows versions set maxvcs incorrectly
* so maxvc=1 can be ignored). If we have too many vcs, we can reuse
* any vc but zero (some servers reset the connection on vcnum zero)
*
*/
static __le16 get_next_vcnum(struct cifs_ses *ses)
{
__u16 vcnum = 0;
struct list_head *tmp;
struct cifs_ses *tmp_ses;
__u16 max_vcs = ses->server->max_vcs;
__u16 i;
int free_vc_found = 0;
/* Quoting the MS-SMB specification: "Windows-based SMB servers set this
field to one but do not enforce this limit, which allows an SMB client
to establish more virtual circuits than allowed by this value ... but
other server implementations can enforce this limit." */
if (max_vcs < 2)
max_vcs = 0xFFFF;
spin_lock(&cifs_tcp_ses_lock);
if ((ses->need_reconnect) && is_first_ses_reconnect(ses))
goto get_vc_num_exit; /* vcnum will be zero */
for (i = ses->server->srv_count - 1; i < max_vcs; i++) {
if (i == 0) /* this is the only connection, use vc 0 */
break;
free_vc_found = 1;
list_for_each(tmp, &ses->server->smb_ses_list) {
tmp_ses = list_entry(tmp, struct cifs_ses,
smb_ses_list);
if (tmp_ses->vcnum == i) {
free_vc_found = 0;
break; /* found duplicate, try next vcnum */
}
}
if (free_vc_found)
break; /* we found a vcnumber that will work - use it */
}
if (i == 0)
vcnum = 0; /* for most common case, ie if one smb session, use
vc zero. Also for case when no free vcnum, zero
is safest to send (some clients only send zero) */
else if (free_vc_found == 0)
vcnum = 1; /* we can not reuse vc=0 safely, since some servers
reset all uids on that, but 1 is ok. */
else
vcnum = i;
ses->vcnum = vcnum;
get_vc_num_exit:
spin_unlock(&cifs_tcp_ses_lock);
return cpu_to_le16(vcnum);
}
static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, SESSION_SETUP_ANDX *pSMB)
{
__u32 capabilities = 0;
@ -128,7 +46,7 @@ static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, SESSION_SETUP_ANDX *pSMB)
CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
USHRT_MAX));
pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
pSMB->req.VcNumber = get_next_vcnum(ses);
pSMB->req.VcNumber = __constant_cpu_to_le16(1);
/* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */