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authorJeff Layton <jlayton@redhat.com>2009-06-25 00:56:52 -0400
committerSteve French <sfrench@us.ibm.com>2009-07-01 21:26:42 +0000
commitcc0bad7552308e8905d6ea56e6b7811fa67e716d (patch)
treec02a91f13a502f444330b91b36ab12f55f352268 /fs/cifs/inode.c
parentd960eea974f5e500c0dcb95a934239cc1f481cfd (diff)
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>
Diffstat (limited to 'fs/cifs/inode.c')
-rw-r--r--fs/cifs/inode.c380
1 files changed, 192 insertions, 188 deletions
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 155c9e785d0..b22379610d7 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -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 = 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;
+
+ /*
+ * Can't safely change the file size here if the client is writing to
+ * it due to potential races.
+ */
+ spin_lock(&inode->i_lock);
+ 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 + 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);
- 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);
+ 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.
*/
- inode->i_mode &= ~S_IFMT;
+ fattr->cf_mode &= ~S_IFMT;
switch (le32_to_cpu(info->Type)) {
case UNIX_FILE:
- inode->i_mode |= S_IFREG;
+ fattr->cf_mode |= S_IFREG;
+ fattr->cf_dtype = DT_REG;
break;
case UNIX_SYMLINK:
- inode->i_mode |= S_IFLNK;
+ fattr->cf_mode |= S_IFLNK;
+ fattr->cf_dtype = DT_LNK;
break;
case UNIX_DIR:
- inode->i_mode |= S_IFDIR;
+ fattr->cf_mode |= S_IFDIR;
+ fattr->cf_dtype = DT_DIR;
break;
case UNIX_CHARDEV:
- inode->i_mode |= S_IFCHR;
- inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
- le64_to_cpu(info->DevMinor) & MINORMASK);
+ 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:
- inode->i_mode |= S_IFBLK;
- inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
- le64_to_cpu(info->DevMinor) & MINORMASK);
+ 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:
- inode->i_mode |= S_IFIFO;
+ fattr->cf_mode |= S_IFIFO;
+ fattr->cf_dtype = DT_FIFO;
break;
case UNIX_SOCKET:
- inode->i_mode |= S_IFSOCK;
+ fattr->cf_mode |= S_IFSOCK;
+ fattr->cf_dtype = DT_SOCK;
break;
default:
/* safest to call it a file if we do not know */
- inode->i_mode |= S_IFREG;
+ 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) &&
- !force_uid_gid)
- inode->i_uid = cifs_sb->mnt_uid;
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
+ fattr->cf_uid = cifs_sb->mnt_uid;
else
- inode->i_uid = le64_to_cpu(info->Uid);
+ fattr->cf_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;
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
+ fattr->cf_gid = cifs_sb->mnt_gid;
else
- inode->i_gid = le64_to_cpu(info->Gid);
+ fattr->cf_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);
-
- /*
- * 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;
- }
- spin_unlock(&inode->i_lock);
+ 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;
-
- memset(pfnd_dat, 0, sizeof(FILE_UNIX_BASIC_INFO));
+ struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
-/* __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);
+ cFYI(1, ("creating fake fattr for DFS referral"));
+
+ 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);
- 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);
+ 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 {
+ return rc;
+ }
- /* 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) {
+ /* get new inode */
+ *pinode = cifs_iget(sb, &fattr);
+ if (!*pinode)
rc = -ENOMEM;
- goto cgiiu_exit;
- }
+ } else {
+ /* we already have inode, update it */
+ cifs_fattr_to_inode(*pinode, &fattr);
}
- inode = *pinode;
- cifsInfo = CIFS_I(inode);
-
- 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 @@ out_reval:
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;
}