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cifs: add new cifs_iget function and convert unix codepath to use it 

cifs: add new cifs_iget function and convert unix codepath to use it

In order to unify some codepaths, introduce a common cifs_fattr struct
for storing inode attributes. The different codepaths (unix, legacy,
normal, etc...) can fill out this struct with inode info. It can then be
passed as an arg to a common set of routines to get and update inodes.

Add a new cifs_iget function that uses iget5_locked to identify inodes.
This will compare inodes based on the uniqueid value in a cifs_fattr
struct.

Rather than filling out an already-created inode, have
cifs_get_inode_info_unix instead fill out cifs_fattr and hand that off
to cifs_iget. cifs_iget can then properly look for hardlinked inodes.

On the readdir side, add a new cifs_readdir_lookup function that spawns
populated dentries. Redefine FILE_UNIX_INFO so that it's basically a
FILE_UNIX_BASIC_INFO that has a few fields wrapped around it. This
allows us to more easily use the same function for filling out the fattr
as the non-readdir codepath.

With this, we should then have proper hardlink detection and can
eventually get rid of some nasty CIFS-specific hacks for handing them.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Jeff Layton 2009-06-25 00:56:52 -04:00 committed by Steve French
parent d960eea974
commit cc0bad7552
7 changed files with 357 additions and 395 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
fs/cifs/cifsfs.h
View File

@ -24,6 +24,19 @@
#define ROOT_I 2
/*
* ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down
* so that it will fit.
*/
static inline ino_t
cifs_uniqueid_to_ino_t(u64 fileid)
{
ino_t ino = (ino_t) fileid;
if (sizeof(ino_t) < sizeof(u64))
ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
return ino;
}
extern struct file_system_type cifs_fs_type;
extern const struct address_space_operations cifs_addr_ops;
extern const struct address_space_operations cifs_addr_ops_smallbuf;

25
fs/cifs/cifsglob.h
View File

@ -371,6 +371,7 @@ struct cifsInodeInfo {
bool oplockPending:1;
bool delete_pending:1; /* DELETE_ON_CLOSE is set */
u64 server_eof; /* current file size on server */
u64 uniqueid; /* server inode number */
struct inode vfs_inode;
};
@ -472,6 +473,30 @@ struct dfs_info3_param {
char *node_name;
};
/*
* common struct for holding inode info when searching for or updating an
* inode with new info
*/
#define CIFS_FATTR_DFS_REFERRAL 0x1
struct cifs_fattr {
u32 cf_flags;
u32 cf_cifsattrs;
u64 cf_uniqueid;
u64 cf_eof;
u64 cf_bytes;
uid_t cf_uid;
gid_t cf_gid;
umode_t cf_mode;
dev_t cf_rdev;
unsigned int cf_nlink;
unsigned int cf_dtype;
struct timespec cf_atime;
struct timespec cf_mtime;
struct timespec cf_ctime;
};
static inline void free_dfs_info_param(struct dfs_info3_param *param)
{
if (param) {

14
fs/cifs/cifspdu.h
View File

@ -2328,19 +2328,7 @@ struct file_attrib_tag {
typedef struct {
__le32 NextEntryOffset;
__u32 ResumeKey; /* as with FileIndex - no need to convert */
__le64 EndOfFile;
__le64 NumOfBytes;
__le64 LastStatusChange; /*SNIA specs DCE time for the 3 time fields */
__le64 LastAccessTime;
__le64 LastModificationTime;
__le64 Uid;
__le64 Gid;
__le32 Type;
__le64 DevMajor;
__le64 DevMinor;
__le64 UniqueId;
__le64 Permissions;
__le64 Nlinks;
FILE_UNIX_BASIC_INFO basic;
char FileName[1];
} __attribute__((packed)) FILE_UNIX_INFO; /* level 0x202 */

9
fs/cifs/cifsproto.h
View File

@ -98,9 +98,14 @@ extern struct timespec cnvrtDosUnixTm(__le16 le_date, __le16 le_time,
extern int cifs_posix_open(char *full_path, struct inode **pinode,
struct super_block *sb, int mode, int oflags,
int *poplock, __u16 *pnetfid, int xid);
extern void posix_fill_in_inode(struct inode *tmp_inode,
FILE_UNIX_BASIC_INFO *pData, int isNewInode);
extern void cifs_unix_basic_to_fattr(struct cifs_fattr *fattr,
FILE_UNIX_BASIC_INFO *info,
struct cifs_sb_info *cifs_sb);
extern void cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr);
extern struct inode *cifs_new_inode(struct super_block *sb, __u64 *inum);
extern struct inode *cifs_iget(struct super_block *sb,
struct cifs_fattr *fattr);
extern int cifs_get_inode_info(struct inode **pinode,
const unsigned char *search_path,
FILE_ALL_INFO *pfile_info,

22
fs/cifs/dir.c
View File

@ -188,6 +188,7 @@ int cifs_posix_open(char *full_path, struct inode **pinode,
FILE_UNIX_BASIC_INFO *presp_data;
__u32 posix_flags = 0;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
struct cifs_fattr fattr;
cFYI(1, ("posix open %s", full_path));
@ -236,22 +237,21 @@ int cifs_posix_open(char *full_path, struct inode **pinode,
if (presp_data->Type == cpu_to_le32(-1))
goto posix_open_ret; /* open ok, caller does qpathinfo */
/* get new inode and set it up */
if (!pinode)
goto posix_open_ret; /* caller does not need info */
cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb);
/* get new inode and set it up */
if (*pinode == NULL) {
__u64 unique_id = le64_to_cpu(presp_data->UniqueId);
*pinode = cifs_new_inode(sb, &unique_id);
*pinode = cifs_iget(sb, &fattr);
if (!*pinode) {
rc = -ENOMEM;
goto posix_open_ret;
}
} else {
cifs_fattr_to_inode(*pinode, &fattr);
}
/* else an inode was passed in. Update its info, don't create one */
/* We do not need to close the file if new_inode fails since
the caller will retry qpathinfo as long as inode is null */
if (*pinode == NULL)
goto posix_open_ret;
posix_fill_in_inode(*pinode, presp_data, 1);
cifs_fill_fileinfo(*pinode, *pnetfid, cifs_sb->tcon, write_only);

416
fs/cifs/inode.c
View File

@ -77,127 +77,146 @@ static void cifs_set_ops(struct inode *inode, const bool is_dfs_referral)
}
}
static void cifs_unix_info_to_inode(struct inode *inode,
FILE_UNIX_BASIC_INFO *info, int force_uid_gid)
/* populate an inode with info from a cifs_fattr struct */
void
cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
{
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
__u64 num_of_bytes = le64_to_cpu(info->NumOfBytes);
__u64 end_of_file = le64_to_cpu(info->EndOfFile);
struct cifsInodeInfo *cifs_i = CIFS_I(inode);
unsigned long now = jiffies;
inode->i_atime = cifs_NTtimeToUnix(info->LastAccessTime);
inode->i_mtime =
cifs_NTtimeToUnix(info->LastModificationTime);
inode->i_ctime = cifs_NTtimeToUnix(info->LastStatusChange);
inode->i_mode = le64_to_cpu(info->Permissions);
inode->i_atime = fattr->cf_atime;
inode->i_mtime = fattr->cf_mtime;
inode->i_ctime = fattr->cf_ctime;
inode->i_mode = fattr->cf_mode;
inode->i_rdev = fattr->cf_rdev;
inode->i_nlink = fattr->cf_nlink;
inode->i_uid = fattr->cf_uid;
inode->i_gid = fattr->cf_gid;
cifs_i->cifsAttrs = fattr->cf_cifsattrs;
cifs_i->uniqueid = fattr->cf_uniqueid;
cFYI(1, ("inode 0x%p old_time=%ld new_time=%ld", inode,
cifs_i->time, now));
cifs_i->time = now;
/*
* Since we set the inode type below we need to mask off
* to avoid strange results if bits set above.
* Can't safely change the file size here if the client is writing to
* it due to potential races.
*/
inode->i_mode &= ~S_IFMT;
switch (le32_to_cpu(info->Type)) {
case UNIX_FILE:
inode->i_mode |= S_IFREG;
break;
case UNIX_SYMLINK:
inode->i_mode |= S_IFLNK;
break;
case UNIX_DIR:
inode->i_mode |= S_IFDIR;
break;
case UNIX_CHARDEV:
inode->i_mode |= S_IFCHR;
inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
le64_to_cpu(info->DevMinor) & MINORMASK);
break;
case UNIX_BLOCKDEV:
inode->i_mode |= S_IFBLK;
inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
le64_to_cpu(info->DevMinor) & MINORMASK);
break;
case UNIX_FIFO:
inode->i_mode |= S_IFIFO;
break;
case UNIX_SOCKET:
inode->i_mode |= S_IFSOCK;
break;
default:
/* safest to call it a file if we do not know */
inode->i_mode |= S_IFREG;
cFYI(1, ("unknown type %d", le32_to_cpu(info->Type)));
break;
}
if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) &&
!force_uid_gid)
inode->i_uid = cifs_sb->mnt_uid;
else
inode->i_uid = le64_to_cpu(info->Uid);
if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) &&
!force_uid_gid)
inode->i_gid = cifs_sb->mnt_gid;
else
inode->i_gid = le64_to_cpu(info->Gid);
inode->i_nlink = le64_to_cpu(info->Nlinks);
cifsInfo->server_eof = end_of_file;
spin_lock(&inode->i_lock);
if (is_size_safe_to_change(cifsInfo, end_of_file)) {
/*
* We can not safely change the file size here if the client
* is writing to it due to potential races.
*/
i_size_write(inode, end_of_file);
if (is_size_safe_to_change(cifs_i, fattr->cf_eof)) {
i_size_write(inode, fattr->cf_eof);
/*
* i_blocks is not related to (i_size / i_blksize),
* but instead 512 byte (2**9) size is required for
* calculating num blocks.
*/
inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9;
}
spin_unlock(&inode->i_lock);
cifs_set_ops(inode, fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL);
}
/* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
void
cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
struct cifs_sb_info *cifs_sb)
{
memset(fattr, 0, sizeof(*fattr));
fattr->cf_uniqueid = le64_to_cpu(info->UniqueId);
fattr->cf_bytes = le64_to_cpu(info->NumOfBytes);
fattr->cf_eof = le64_to_cpu(info->EndOfFile);
fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
fattr->cf_mtime = cifs_NTtimeToUnix(info->LastModificationTime);
fattr->cf_ctime = cifs_NTtimeToUnix(info->LastStatusChange);
fattr->cf_mode = le64_to_cpu(info->Permissions);
/*
* Since we set the inode type below we need to mask off
* to avoid strange results if bits set above.
*/
fattr->cf_mode &= ~S_IFMT;
switch (le32_to_cpu(info->Type)) {
case UNIX_FILE:
fattr->cf_mode |= S_IFREG;
fattr->cf_dtype = DT_REG;
break;
case UNIX_SYMLINK:
fattr->cf_mode |= S_IFLNK;
fattr->cf_dtype = DT_LNK;
break;
case UNIX_DIR:
fattr->cf_mode |= S_IFDIR;
fattr->cf_dtype = DT_DIR;
break;
case UNIX_CHARDEV:
fattr->cf_mode |= S_IFCHR;
fattr->cf_dtype = DT_CHR;
fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
le64_to_cpu(info->DevMinor) & MINORMASK);
break;
case UNIX_BLOCKDEV:
fattr->cf_mode |= S_IFBLK;
fattr->cf_dtype = DT_BLK;
fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
le64_to_cpu(info->DevMinor) & MINORMASK);
break;
case UNIX_FIFO:
fattr->cf_mode |= S_IFIFO;
fattr->cf_dtype = DT_FIFO;
break;
case UNIX_SOCKET:
fattr->cf_mode |= S_IFSOCK;
fattr->cf_dtype = DT_SOCK;
break;
default:
/* safest to call it a file if we do not know */
fattr->cf_mode |= S_IFREG;
fattr->cf_dtype = DT_REG;
cFYI(1, ("unknown type %d", le32_to_cpu(info->Type)));
break;
}
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
fattr->cf_uid = cifs_sb->mnt_uid;
else
fattr->cf_uid = le64_to_cpu(info->Uid);
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
fattr->cf_gid = cifs_sb->mnt_gid;
else
fattr->cf_gid = le64_to_cpu(info->Gid);
fattr->cf_nlink = le64_to_cpu(info->Nlinks);
}
/*
* Needed to setup inode data for the directory which is the
* junction to the new submount (ie to setup the fake directory
* which represents a DFS referral)
* Fill a cifs_fattr struct with fake inode info.
*
* Needed to setup cifs_fattr data for the directory which is the
* junction to the new submount (ie to setup the fake directory
* which represents a DFS referral).
*/
static void fill_fake_finddataunix(FILE_UNIX_BASIC_INFO *pfnd_dat,
struct super_block *sb)
void
cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
{
struct inode *pinode = NULL;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
memset(pfnd_dat, 0, sizeof(FILE_UNIX_BASIC_INFO));
cFYI(1, ("creating fake fattr for DFS referral"));
/* __le64 pfnd_dat->EndOfFile = cpu_to_le64(0);
__le64 pfnd_dat->NumOfBytes = cpu_to_le64(0);
__u64 UniqueId = 0; */
pfnd_dat->LastStatusChange =
cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
pfnd_dat->LastAccessTime =
cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
pfnd_dat->LastModificationTime =
cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
pfnd_dat->Type = cpu_to_le32(UNIX_DIR);
pfnd_dat->Permissions = cpu_to_le64(S_IXUGO | S_IRWXU);
pfnd_dat->Nlinks = cpu_to_le64(2);
if (sb->s_root)
pinode = sb->s_root->d_inode;
if (pinode == NULL)
return;
/* fill in default values for the remaining based on root
inode since we can not query the server for this inode info */
pfnd_dat->DevMajor = cpu_to_le64(MAJOR(pinode->i_rdev));
pfnd_dat->DevMinor = cpu_to_le64(MINOR(pinode->i_rdev));
pfnd_dat->Uid = cpu_to_le64(pinode->i_uid);
pfnd_dat->Gid = cpu_to_le64(pinode->i_gid);
memset(fattr, 0, sizeof(*fattr));
fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
fattr->cf_uid = cifs_sb->mnt_uid;
fattr->cf_gid = cifs_sb->mnt_gid;
fattr->cf_atime = CURRENT_TIME;
fattr->cf_ctime = CURRENT_TIME;
fattr->cf_mtime = CURRENT_TIME;
fattr->cf_nlink = 2;
fattr->cf_flags |= CIFS_FATTR_DFS_REFERRAL;
}
/**
@ -244,66 +263,42 @@ cifs_new_inode(struct super_block *sb, __u64 *inum)
}
int cifs_get_inode_info_unix(struct inode **pinode,
const unsigned char *full_path, struct super_block *sb, int xid)
const unsigned char *full_path,
struct super_block *sb, int xid)
{
int rc = 0;
int rc;
FILE_UNIX_BASIC_INFO find_data;
struct cifsTconInfo *pTcon;
struct inode *inode;
struct cifs_fattr fattr;
struct cifsTconInfo *tcon;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
bool is_dfs_referral = false;
struct cifsInodeInfo *cifsInfo;
__u64 num_of_bytes;
__u64 end_of_file;
pTcon = cifs_sb->tcon;
tcon = cifs_sb->tcon;
cFYI(1, ("Getting info on %s", full_path));
/* could have done a find first instead but this returns more info */
rc = CIFSSMBUnixQPathInfo(xid, pTcon, full_path, &find_data,
rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
if (rc == -EREMOTE && !is_dfs_referral) {
is_dfs_referral = true;
cFYI(DBG2, ("DFS ref"));
/* for DFS, server does not give us real inode data */
fill_fake_finddataunix(&find_data, sb);
if (!rc) {
cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
} else if (rc == -EREMOTE) {
cifs_create_dfs_fattr(&fattr, sb);
rc = 0;
} else if (rc)
goto cgiiu_exit;
num_of_bytes = le64_to_cpu(find_data.NumOfBytes);
end_of_file = le64_to_cpu(find_data.EndOfFile);
/* get new inode */
if (*pinode == NULL) {
__u64 unique_id = le64_to_cpu(find_data.UniqueId);
*pinode = cifs_new_inode(sb, &unique_id);
if (*pinode == NULL) {
rc = -ENOMEM;
goto cgiiu_exit;
}
} else {
return rc;
}
inode = *pinode;
cifsInfo = CIFS_I(inode);
if (*pinode == NULL) {
/* get new inode */
*pinode = cifs_iget(sb, &fattr);
if (!*pinode)
rc = -ENOMEM;
} else {
/* we already have inode, update it */
cifs_fattr_to_inode(*pinode, &fattr);
}
cFYI(1, ("Old time %ld", cifsInfo->time));
cifsInfo->time = jiffies;
cFYI(1, ("New time %ld", cifsInfo->time));
/* this is ok to set on every inode revalidate */
atomic_set(&cifsInfo->inUse, 1);
cifs_unix_info_to_inode(inode, &find_data, 0);
if (num_of_bytes < end_of_file)
cFYI(1, ("allocation size less than end of file"));
cFYI(1, ("Size %ld and blocks %llu",
(unsigned long) inode->i_size,
(unsigned long long)inode->i_blocks));
cifs_set_ops(inode, is_dfs_referral);
cgiiu_exit:
return rc;
}
@ -695,33 +690,85 @@ char *cifs_build_path_to_root(struct cifs_sb_info *cifs_sb)
return full_path;
}
static int
cifs_find_inode(struct inode *inode, void *opaque)
{
struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
return 0;
return 1;
}
static int
cifs_init_inode(struct inode *inode, void *opaque)
{
struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
return 0;
}
/* Given fattrs, get a corresponding inode */
struct inode *
cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
{
unsigned long hash;
struct inode *inode;
cFYI(1, ("looking for uniqueid=%llu", fattr->cf_uniqueid));
/* hash down to 32-bits on 32-bit arch */
hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
/* we have fattrs in hand, update the inode */
if (inode) {
cifs_fattr_to_inode(inode, fattr);
if (sb->s_flags & MS_NOATIME)
inode->i_flags |= S_NOATIME | S_NOCMTIME;
if (inode->i_state & I_NEW) {
inode->i_ino = hash;
unlock_new_inode(inode);
}
}
return inode;
}
/* gets root inode */
struct inode *cifs_root_iget(struct super_block *sb, unsigned long ino)
{
int xid;
struct cifs_sb_info *cifs_sb;
struct inode *inode;
struct inode *inode = NULL;
long rc;
char *full_path;
inode = iget_locked(sb, ino);
if (!inode)
return ERR_PTR(-ENOMEM);
if (!(inode->i_state & I_NEW))
return inode;
cifs_sb = CIFS_SB(inode->i_sb);
cifs_sb = CIFS_SB(sb);
full_path = cifs_build_path_to_root(cifs_sb);
if (full_path == NULL)
return ERR_PTR(-ENOMEM);
xid = GetXid();
if (cifs_sb->tcon->unix_ext)
rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb,
xid);
else
if (cifs_sb->tcon->unix_ext) {
rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
if (!inode)
return ERR_PTR(-ENOMEM);
} else {
inode = iget_locked(sb, ino);
if (!inode)
return ERR_PTR(-ENOMEM);
if (!(inode->i_state & I_NEW))
return inode;
rc = cifs_get_inode_info(&inode, full_path, NULL, inode->i_sb,
xid, NULL);
unlock_new_inode(inode);
}
if (rc && cifs_sb->tcon->ipc) {
cFYI(1, ("ipc connection - fake read inode"));
inode->i_mode |= S_IFDIR;
@ -737,7 +784,6 @@ struct inode *cifs_root_iget(struct super_block *sb, unsigned long ino)
return ERR_PTR(rc);
}
unlock_new_inode(inode);
kfree(full_path);
/* can not call macro FreeXid here since in a void func
@ -1063,44 +1109,6 @@ int cifs_unlink(struct inode *dir, struct dentry *dentry)
return rc;
}
void posix_fill_in_inode(struct inode *tmp_inode,
FILE_UNIX_BASIC_INFO *pData, int isNewInode)
{
struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
loff_t local_size;
struct timespec local_mtime;
cifsInfo->time = jiffies;
atomic_inc(&cifsInfo->inUse);
/* save mtime and size */
local_mtime = tmp_inode->i_mtime;
local_size = tmp_inode->i_size;
cifs_unix_info_to_inode(tmp_inode, pData, 1);
cifs_set_ops(tmp_inode, false);
if (!S_ISREG(tmp_inode->i_mode))
return;
/*
* No sense invalidating pages for new inode
* since we we have not started caching
* readahead file data yet.
*/
if (isNewInode)
return;
if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
(local_size == tmp_inode->i_size)) {
cFYI(1, ("inode exists but unchanged"));
} else {
/* file may have changed on server */
cFYI(1, ("invalidate inode, readdir detected change"));
invalidate_remote_inode(tmp_inode);
}
}
int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
{
int rc = 0, tmprc;
@ -1109,6 +1117,7 @@ int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
struct cifsTconInfo *pTcon;
char *full_path = NULL;
struct inode *newinode = NULL;
struct cifs_fattr fattr;
cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
@ -1148,7 +1157,6 @@ int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
cFYI(1, ("posix mkdir returned 0x%x", rc));
d_drop(direntry);
} else {
__u64 unique_id;
if (pInfo->Type == cpu_to_le32(-1)) {
/* no return info, go query for it */
kfree(pInfo);
@ -1162,20 +1170,15 @@ int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
else
direntry->d_op = &cifs_dentry_ops;
unique_id = le64_to_cpu(pInfo->UniqueId);
newinode = cifs_new_inode(inode->i_sb, &unique_id);
if (newinode == NULL) {
cifs_unix_basic_to_fattr(&fattr, pInfo, cifs_sb);
newinode = cifs_iget(inode->i_sb, &fattr);
if (!newinode) {
kfree(pInfo);
goto mkdir_get_info;
}
newinode->i_nlink = 2;
d_instantiate(direntry, newinode);
/* we already checked in POSIXCreate whether
frame was long enough */
posix_fill_in_inode(direntry->d_inode,
pInfo, 1 /* NewInode */);
#ifdef CONFIG_CIFS_DEBUG2
cFYI(1, ("instantiated dentry %p %s to inode %p",
direntry, direntry->d_name.name, newinode));
@ -1622,6 +1625,7 @@ int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
if (!err) {
generic_fillattr(dentry->d_inode, stat);
stat->blksize = CIFS_MAX_MSGSIZE;
stat->ino = CIFS_I(dentry->d_inode)->uniqueid;
}
return err;
}

253
fs/cifs/readdir.c
View File

@ -63,6 +63,55 @@ static inline void dump_cifs_file_struct(struct file *file, char *label)
}
#endif /* DEBUG2 */
/*
* Find the dentry that matches "name". If there isn't one, create one. If it's
* a negative dentry or the uniqueid changed, then drop it and recreate it.
*/
static struct dentry *
cifs_readdir_lookup(struct dentry *parent, struct qstr *name,
struct cifs_fattr *fattr)
{
struct dentry *dentry, *alias;
struct inode *inode;
struct super_block *sb = parent->d_inode->i_sb;
cFYI(1, ("For %s", name->name));
dentry = d_lookup(parent, name);
if (dentry) {
/* FIXME: check for inode number changes? */
if (dentry->d_inode != NULL)
return dentry;
d_drop(dentry);
dput(dentry);
}
dentry = d_alloc(parent, name);
if (dentry == NULL)
return NULL;
inode = cifs_iget(sb, fattr);
if (!inode) {
dput(dentry);
return NULL;
}
if (CIFS_SB(sb)->tcon->nocase)
dentry->d_op = &cifs_ci_dentry_ops;
else
dentry->d_op = &cifs_dentry_ops;
alias = d_materialise_unique(dentry, inode);
if (alias != NULL) {
dput(dentry);
if (IS_ERR(alias))
return NULL;
dentry = alias;
}
return dentry;
}
/* Returns 1 if new inode created, 2 if both dentry and inode were */
/* Might check in the future if inode number changed so we can rehash inode */
static int
@ -76,7 +125,6 @@ construct_dentry(struct qstr *qstring, struct file *file,
cFYI(1, ("For %s", qstring->name));
qstring->hash = full_name_hash(qstring->name, qstring->len);
tmp_dentry = d_lookup(file->f_path.dentry, qstring);
if (tmp_dentry) {
/* BB: overwrite old name? i.e. tmp_dentry->d_name and
@ -299,140 +347,6 @@ static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
}
}
static void unix_fill_in_inode(struct inode *tmp_inode,
FILE_UNIX_INFO *pfindData, unsigned int *pobject_type, int isNewInode)
{
loff_t local_size;
struct timespec local_mtime;
struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
__u32 type = le32_to_cpu(pfindData->Type);
__u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
__u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
cifsInfo->time = jiffies;
atomic_inc(&cifsInfo->inUse);
/* save mtime and size */
local_mtime = tmp_inode->i_mtime;
local_size = tmp_inode->i_size;
tmp_inode->i_atime =
cifs_NTtimeToUnix(pfindData->LastAccessTime);
tmp_inode->i_mtime =
cifs_NTtimeToUnix(pfindData->LastModificationTime);
tmp_inode->i_ctime =
cifs_NTtimeToUnix(pfindData->LastStatusChange);
tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
/* since we set the inode type below we need to mask off type
to avoid strange results if bits above were corrupt */
tmp_inode->i_mode &= ~S_IFMT;
if (type == UNIX_FILE) {
*pobject_type = DT_REG;
tmp_inode->i_mode |= S_IFREG;
} else if (type == UNIX_SYMLINK) {
*pobject_type = DT_LNK;
tmp_inode->i_mode |= S_IFLNK;
} else if (type == UNIX_DIR) {
*pobject_type = DT_DIR;
tmp_inode->i_mode |= S_IFDIR;
} else if (type == UNIX_CHARDEV) {
*pobject_type = DT_CHR;
tmp_inode->i_mode |= S_IFCHR;
tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
le64_to_cpu(pfindData->DevMinor) & MINORMASK);
} else if (type == UNIX_BLOCKDEV) {
*pobject_type = DT_BLK;
tmp_inode->i_mode |= S_IFBLK;
tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
le64_to_cpu(pfindData->DevMinor) & MINORMASK);
} else if (type == UNIX_FIFO) {
*pobject_type = DT_FIFO;
tmp_inode->i_mode |= S_IFIFO;
} else if (type == UNIX_SOCKET) {
*pobject_type = DT_SOCK;
tmp_inode->i_mode |= S_IFSOCK;
} else {
/* safest to just call it a file */
*pobject_type = DT_REG;
tmp_inode->i_mode |= S_IFREG;
cFYI(1, ("unknown inode type %d", type));
}
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
tmp_inode->i_uid = cifs_sb->mnt_uid;
else
tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
tmp_inode->i_gid = cifs_sb->mnt_gid;
else
tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
cifsInfo->server_eof = end_of_file;
spin_lock(&tmp_inode->i_lock);
if (is_size_safe_to_change(cifsInfo, end_of_file)) {
/* can not safely change the file size here if the
client is writing to it due to potential races */
i_size_write(tmp_inode, end_of_file);
/* 512 bytes (2**9) is the fake blocksize that must be used */
/* for this calculation, not the real blocksize */
tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
}
spin_unlock(&tmp_inode->i_lock);
if (S_ISREG(tmp_inode->i_mode)) {
cFYI(1, ("File inode"));
tmp_inode->i_op = &cifs_file_inode_ops;
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
else
tmp_inode->i_fop = &cifs_file_direct_ops;
} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
tmp_inode->i_fop = &cifs_file_nobrl_ops;
else
tmp_inode->i_fop = &cifs_file_ops;
if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
(cifs_sb->tcon->ses->server->maxBuf <
PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
else
tmp_inode->i_data.a_ops = &cifs_addr_ops;
if (isNewInode)
return; /* No sense invalidating pages for new inode
since we have not started caching readahead
file data for it yet */
if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
(local_size == tmp_inode->i_size)) {
cFYI(1, ("inode exists but unchanged"));
} else {
/* file may have changed on server */
cFYI(1, ("invalidate inode, readdir detected change"));
invalidate_remote_inode(tmp_inode);
}
} else if (S_ISDIR(tmp_inode->i_mode)) {
cFYI(1, ("Directory inode"));
tmp_inode->i_op = &cifs_dir_inode_ops;
tmp_inode->i_fop = &cifs_dir_ops;
} else if (S_ISLNK(tmp_inode->i_mode)) {
cFYI(1, ("Symbolic Link inode"));
tmp_inode->i_op = &cifs_symlink_inode_ops;
/* tmp_inode->i_fop = *//* do not need to set to anything */
} else {
cFYI(1, ("Special inode"));
init_special_inode(tmp_inode, tmp_inode->i_mode,
tmp_inode->i_rdev);
}
}
/* BB eventually need to add the following helper function to
resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
we try to do FindFirst on (NTFS) directory symlinks */
@ -872,7 +786,7 @@ static int cifs_get_name_from_search_buf(struct qstr *pqst,
len = strnlen(filename, PATH_MAX);
}
*pinum = le64_to_cpu(pFindData->UniqueId);
*pinum = le64_to_cpu(pFindData->basic.UniqueId);
} else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
FILE_DIRECTORY_INFO *pFindData =
(FILE_DIRECTORY_INFO *)current_entry;
@ -934,9 +848,11 @@ static int cifs_filldir(char *pfindEntry, struct file *file, filldir_t filldir,
struct cifsFileInfo *pCifsF;
unsigned int obj_type;
__u64 inum;
ino_t ino;
struct cifs_sb_info *cifs_sb;
struct inode *tmp_inode;
struct dentry *tmp_dentry;
struct cifs_fattr fattr;
/* get filename and len into qstring */
/* get dentry */
@ -967,39 +883,49 @@ static int cifs_filldir(char *pfindEntry, struct file *file, filldir_t filldir,
return rc;
/* only these two infolevels return valid inode numbers */
if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX ||
pCifsF->srch_inf.info_level == SMB_FIND_FILE_ID_FULL_DIR_INFO)
rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry,
&inum);
else
rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry,
NULL);
if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
cifs_unix_basic_to_fattr(&fattr,
&((FILE_UNIX_INFO *) pfindEntry)->basic,
cifs_sb);
tmp_dentry = cifs_readdir_lookup(file->f_dentry, &qstring,
&fattr);
obj_type = fattr.cf_dtype;
ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
} else {
if (pCifsF->srch_inf.info_level ==
SMB_FIND_FILE_ID_FULL_DIR_INFO)
rc = construct_dentry(&qstring, file, &tmp_inode,
&tmp_dentry, &inum);
else
rc = construct_dentry(&qstring, file, &tmp_inode,
&tmp_dentry, NULL);
if ((tmp_inode == NULL) || (tmp_dentry == NULL))
return -ENOMEM;
if ((tmp_inode == NULL) || (tmp_dentry == NULL)) {
rc = -ENOMEM;
goto out;
}
/* we pass in rc below, indicating whether it is a new inode,
so we can figure out whether to invalidate the inode cached
data if the file has changed */
if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
unix_fill_in_inode(tmp_inode,
(FILE_UNIX_INFO *)pfindEntry,
&obj_type, rc);
else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
pfindEntry, &obj_type, rc);
else
fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
/* we pass in rc below, indicating whether it is a new inode,
* so we can figure out whether to invalidate the inode cached
* data if the file has changed
*/
if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
fill_in_inode(tmp_inode, 0, pfindEntry, &obj_type, rc);
else
fill_in_inode(tmp_inode, 1, pfindEntry, &obj_type, rc);
if (rc) /* new inode - needs to be tied to dentry */ {
d_instantiate(tmp_dentry, tmp_inode);
if (rc == 2)
d_rehash(tmp_dentry);
/* new inode - needs to be tied to dentry */
if (rc) {
d_instantiate(tmp_dentry, tmp_inode);
if (rc == 2)
d_rehash(tmp_dentry);
}
ino = cifs_uniqueid_to_ino_t(tmp_inode->i_ino);
}
rc = filldir(direntry, qstring.name, qstring.len, file->f_pos,
tmp_inode->i_ino, obj_type);
ino, obj_type);
if (rc) {
cFYI(1, ("filldir rc = %d", rc));
/* we can not return filldir errors to the caller
@ -1008,6 +934,7 @@ static int cifs_filldir(char *pfindEntry, struct file *file, filldir_t filldir,
rc = -EOVERFLOW;
}
out:
dput(tmp_dentry);
return rc;
}