From eeb910a6d46103594eb63e6eba1aeb02022368a4 Mon Sep 17 00:00:00 2001 From: Pavel Shilovsky Date: Thu, 25 Nov 2010 15:12:39 +0300 Subject: [PATCH] CIFS: Simplify non-posix open stuff (try #2) Delete cifs_open_inode_helper and move non-posix open related things to cifs_nt_open function. Reviewed-by: Jeff Layton Signed-off-by: Pavel Shilovsky Signed-off-by: Steve French --- fs/cifs/file.c | 189 ++++++++++++++++++++++----------------------------------- 1 file changed, 73 insertions(+), 116 deletions(-) diff --git a/fs/cifs/file.c b/fs/cifs/file.c index 5a28660..f95ba45 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); -- 2.7.4