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-rw-r--r--fs/cifs/file.c189
1 files changed, 73 insertions, 116 deletions
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 5a28660ca2b5..f95ba451173f 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -104,53 +104,6 @@ static inline int cifs_get_disposition(unsigned int flags)
return FILE_OPEN;
}
-static inline int cifs_open_inode_helper(struct inode *inode,
- struct cifsTconInfo *pTcon, __u32 oplock, FILE_ALL_INFO *buf,
- char *full_path, int xid)
-{
- struct cifsInodeInfo *pCifsInode = CIFS_I(inode);
- struct timespec temp;
- int rc;
-
- if (pCifsInode->clientCanCacheRead) {
- /* we have the inode open somewhere else
- no need to discard cache data */
- goto client_can_cache;
- }
-
- /* BB need same check in cifs_create too? */
- /* if not oplocked, invalidate inode pages if mtime or file
- size changed */
- temp = cifs_NTtimeToUnix(buf->LastWriteTime);
- if (timespec_equal(&inode->i_mtime, &temp) &&
- (inode->i_size ==
- (loff_t)le64_to_cpu(buf->EndOfFile))) {
- cFYI(1, "inode unchanged on server");
- } else {
- if (inode->i_mapping) {
- /* BB no need to lock inode until after invalidate
- since namei code should already have it locked? */
- rc = filemap_write_and_wait(inode->i_mapping);
- mapping_set_error(inode->i_mapping, rc);
- }
- cFYI(1, "invalidating remote inode since open detected it "
- "changed");
- invalidate_remote_inode(inode);
- }
-
-client_can_cache:
- if (pTcon->unix_ext)
- rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb,
- xid);
- else
- rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb,
- xid, NULL);
-
- cifs_set_oplock_level(pCifsInode, oplock);
-
- return rc;
-}
-
int cifs_posix_open(char *full_path, struct inode **pinode,
struct super_block *sb, int mode, unsigned int f_flags,
__u32 *poplock, __u16 *pnetfid, int xid)
@@ -213,6 +166,76 @@ posix_open_ret:
return rc;
}
+static int
+cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb,
+ struct cifsTconInfo *tcon, unsigned int f_flags, __u32 *poplock,
+ __u16 *pnetfid, int xid)
+{
+ int rc;
+ int desiredAccess;
+ int disposition;
+ FILE_ALL_INFO *buf;
+
+ desiredAccess = cifs_convert_flags(f_flags);
+
+/*********************************************************************
+ * open flag mapping table:
+ *
+ * POSIX Flag CIFS Disposition
+ * ---------- ----------------
+ * O_CREAT FILE_OPEN_IF
+ * O_CREAT | O_EXCL FILE_CREATE
+ * O_CREAT | O_TRUNC FILE_OVERWRITE_IF
+ * O_TRUNC FILE_OVERWRITE
+ * none of the above FILE_OPEN
+ *
+ * Note that there is not a direct match between disposition
+ * FILE_SUPERSEDE (ie create whether or not file exists although
+ * O_CREAT | O_TRUNC is similar but truncates the existing
+ * file rather than creating a new file as FILE_SUPERSEDE does
+ * (which uses the attributes / metadata passed in on open call)
+ *?
+ *? O_SYNC is a reasonable match to CIFS writethrough flag
+ *? and the read write flags match reasonably. O_LARGEFILE
+ *? is irrelevant because largefile support is always used
+ *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY,
+ * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation
+ *********************************************************************/
+
+ disposition = cifs_get_disposition(f_flags);
+
+ /* BB pass O_SYNC flag through on file attributes .. BB */
+
+ buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ if (tcon->ses->capabilities & CAP_NT_SMBS)
+ rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
+ desiredAccess, CREATE_NOT_DIR, pnetfid, poplock, buf,
+ cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
+ & CIFS_MOUNT_MAP_SPECIAL_CHR);
+ else
+ rc = SMBLegacyOpen(xid, tcon, full_path, disposition,
+ desiredAccess, CREATE_NOT_DIR, pnetfid, poplock, buf,
+ cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
+ & CIFS_MOUNT_MAP_SPECIAL_CHR);
+
+ if (rc)
+ goto out;
+
+ if (tcon->unix_ext)
+ rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb,
+ xid);
+ else
+ rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb,
+ xid, pnetfid);
+
+out:
+ kfree(buf);
+ return rc;
+}
+
struct cifsFileInfo *
cifs_new_fileinfo(__u16 fileHandle, struct file *file,
struct tcon_link *tlink, __u32 oplock)
@@ -317,10 +340,7 @@ int cifs_open(struct inode *inode, struct file *file)
struct cifsFileInfo *pCifsFile = NULL;
struct cifsInodeInfo *pCifsInode;
char *full_path = NULL;
- int desiredAccess;
- int disposition;
__u16 netfid;
- FILE_ALL_INFO *buf = NULL;
xid = GetXid();
@@ -385,71 +405,9 @@ int cifs_open(struct inode *inode, struct file *file)
or DFS errors */
}
- desiredAccess = cifs_convert_flags(file->f_flags);
-
-/*********************************************************************
- * open flag mapping table:
- *
- * POSIX Flag CIFS Disposition
- * ---------- ----------------
- * O_CREAT FILE_OPEN_IF
- * O_CREAT | O_EXCL FILE_CREATE
- * O_CREAT | O_TRUNC FILE_OVERWRITE_IF
- * O_TRUNC FILE_OVERWRITE
- * none of the above FILE_OPEN
- *
- * Note that there is not a direct match between disposition
- * FILE_SUPERSEDE (ie create whether or not file exists although
- * O_CREAT | O_TRUNC is similar but truncates the existing
- * file rather than creating a new file as FILE_SUPERSEDE does
- * (which uses the attributes / metadata passed in on open call)
- *?
- *? O_SYNC is a reasonable match to CIFS writethrough flag
- *? and the read write flags match reasonably. O_LARGEFILE
- *? is irrelevant because largefile support is always used
- *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY,
- * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation
- *********************************************************************/
-
- disposition = cifs_get_disposition(file->f_flags);
-
- /* BB pass O_SYNC flag through on file attributes .. BB */
-
- /* Also refresh inode by passing in file_info buf returned by SMBOpen
- and calling get_inode_info with returned buf (at least helps
- non-Unix server case) */
-
- /* BB we can not do this if this is the second open of a file
- and the first handle has writebehind data, we might be
- able to simply do a filemap_fdatawrite/filemap_fdatawait first */
- buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
- if (!buf) {
- rc = -ENOMEM;
- goto out;
- }
-
- if (tcon->ses->capabilities & CAP_NT_SMBS)
- rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
- desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf,
- cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
- & CIFS_MOUNT_MAP_SPECIAL_CHR);
- else
- rc = -EIO; /* no NT SMB support fall into legacy open below */
-
- if (rc == -EIO) {
- /* Old server, try legacy style OpenX */
- rc = SMBLegacyOpen(xid, tcon, full_path, disposition,
- desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf,
- cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
- & CIFS_MOUNT_MAP_SPECIAL_CHR);
- }
- if (rc) {
- cFYI(1, "cifs_open returned 0x%x", rc);
- goto out;
- }
-
- rc = cifs_open_inode_helper(inode, tcon, oplock, buf, full_path, xid);
- if (rc != 0)
+ rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, file->f_flags,
+ &oplock, &netfid, xid);
+ if (rc)
goto out;
pCifsFile = cifs_new_fileinfo(netfid, file, tlink, oplock);
@@ -481,7 +439,6 @@ int cifs_open(struct inode *inode, struct file *file)
}
out:
- kfree(buf);
kfree(full_path);
FreeXid(xid);
cifs_put_tlink(tlink);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 12:16:14 +0000