2010/12/8 Shirish Pargaonkar <shirishpargaonkar@xxxxxxxxx>:
> On Wed, Dec 8, 2010 at 8:28 AM, Pavel Shilovsky <piastryyy@xxxxxxxxx> wrote:
>> Delete cifs_open_inode_helper and move non-posix open related things
>> to cifs_nt_open function.
>>
>> Signed-off-by: Pavel Shilovsky <piastryyy@xxxxxxxxx>
>> ---
>> fs/cifs/file.c | 189 ++++++++++++++++++++++----------------------------------
>> 1 files changed, 73 insertions(+), 116 deletions(-)
>>
>> diff --git a/fs/cifs/file.c b/fs/cifs/file.c
>> index b857ce5..8f6a084 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);
>> +
>
> Just a nit-picking, we probably do not expect a non-posix function
> calling a function for unix!
>
If the server broke posix open but still supports unix extensions we
should use unix specific function, I think.
--
Best regards,
Pavel Shilovsky.
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