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CIFS: Implement cifs_strict_fsync 

Invalidate inode mapping if we don't have at least Level II oplock in
cifs_strict_fsync. Also remove filemap_write_and_wait call from cifs_fsync
because it is previously called from vfs_fsync_range. Add file operations'
structures for strict cache mode.

Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Pavel Shilovsky 2010-12-12 13:11:13 +03:00 committed by Steve French
parent 4f8ba8a0c0
commit 8be7e6ba14
4 changed files with 78 additions and 12 deletions
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38
fs/cifs/cifsfs.c
View File

@ -733,6 +733,25 @@ const struct file_operations cifs_file_ops = {
.setlease = cifs_setlease,
};
const struct file_operations cifs_file_strict_ops = {
.read = do_sync_read,
.write = do_sync_write,
.aio_read = generic_file_aio_read,
.aio_write = cifs_file_aio_write,
.open = cifs_open,
.release = cifs_close,
.lock = cifs_lock,
.fsync = cifs_strict_fsync,
.flush = cifs_flush,
.mmap = cifs_file_mmap,
.splice_read = generic_file_splice_read,
.llseek = cifs_llseek,
#ifdef CONFIG_CIFS_POSIX
.unlocked_ioctl = cifs_ioctl,
#endif /* CONFIG_CIFS_POSIX */
.setlease = cifs_setlease,
};
const struct file_operations cifs_file_direct_ops = {
/* no aio, no readv -
BB reevaluate whether they can be done with directio, no cache */
@ -751,6 +770,7 @@ const struct file_operations cifs_file_direct_ops = {
.llseek = cifs_llseek,
.setlease = cifs_setlease,
};
const struct file_operations cifs_file_nobrl_ops = {
.read = do_sync_read,
.write = do_sync_write,
@ -769,6 +789,24 @@ const struct file_operations cifs_file_nobrl_ops = {
.setlease = cifs_setlease,
};
const struct file_operations cifs_file_strict_nobrl_ops = {
.read = do_sync_read,
.write = do_sync_write,
.aio_read = generic_file_aio_read,
.aio_write = cifs_file_aio_write,
.open = cifs_open,
.release = cifs_close,
.fsync = cifs_strict_fsync,
.flush = cifs_flush,
.mmap = cifs_file_mmap,
.splice_read = generic_file_splice_read,
.llseek = cifs_llseek,
#ifdef CONFIG_CIFS_POSIX
.unlocked_ioctl = cifs_ioctl,
#endif /* CONFIG_CIFS_POSIX */
.setlease = cifs_setlease,
};
const struct file_operations cifs_file_direct_nobrl_ops = {
/* no mmap, no aio, no readv -
BB reevaluate whether they can be done with directio, no cache */

8
fs/cifs/cifsfs.h
View File

@ -61,6 +61,7 @@ extern int cifs_rename(struct inode *, struct dentry *, struct inode *,
struct dentry *);
extern int cifs_revalidate_file(struct file *filp);
extern int cifs_revalidate_dentry(struct dentry *);
extern void cifs_invalidate_mapping(struct inode *inode);
extern int cifs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
extern int cifs_setattr(struct dentry *, struct iattr *);
@ -72,8 +73,10 @@ extern const struct inode_operations cifs_dfs_referral_inode_operations;
/* Functions related to files and directories */
extern const struct file_operations cifs_file_ops;
extern const struct file_operations cifs_file_direct_ops; /* if directio mnt */
extern const struct file_operations cifs_file_nobrl_ops;
extern const struct file_operations cifs_file_direct_nobrl_ops; /* no brlocks */
extern const struct file_operations cifs_file_strict_ops; /* if strictio mnt */
extern const struct file_operations cifs_file_nobrl_ops; /* no brlocks */
extern const struct file_operations cifs_file_direct_nobrl_ops;
extern const struct file_operations cifs_file_strict_nobrl_ops;
extern int cifs_open(struct inode *inode, struct file *file);
extern int cifs_close(struct inode *inode, struct file *file);
extern int cifs_closedir(struct inode *inode, struct file *file);
@ -83,6 +86,7 @@ extern ssize_t cifs_user_write(struct file *file, const char __user *write_data,
size_t write_size, loff_t *poffset);
extern int cifs_lock(struct file *, int, struct file_lock *);
extern int cifs_fsync(struct file *, int);
extern int cifs_strict_fsync(struct file *, int);
extern int cifs_flush(struct file *, fl_owner_t id);
extern int cifs_file_mmap(struct file * , struct vm_area_struct *);
extern const struct file_operations cifs_dir_ops;

36
fs/cifs/file.c
View File

@ -1528,27 +1528,47 @@ static int cifs_write_end(struct file *file, struct address_space *mapping,
return rc;
}
int cifs_fsync(struct file *file, int datasync)
int cifs_strict_fsync(struct file *file, int datasync)
{
int xid;
int rc = 0;
struct cifsTconInfo *tcon;
struct cifsFileInfo *smbfile = file->private_data;
struct inode *inode = file->f_path.dentry->d_inode;
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
xid = GetXid();
cFYI(1, "Sync file - name: %s datasync: 0x%x",
file->f_path.dentry->d_name.name, datasync);
rc = filemap_write_and_wait(inode->i_mapping);
if (rc == 0) {
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
if (!CIFS_I(inode)->clientCanCacheRead)
cifs_invalidate_mapping(inode);
tcon = tlink_tcon(smbfile->tlink);
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC))
rc = CIFSSMBFlush(xid, tcon, smbfile->netfid);
}
tcon = tlink_tcon(smbfile->tlink);
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC))
rc = CIFSSMBFlush(xid, tcon, smbfile->netfid);
FreeXid(xid);
return rc;
}
int cifs_fsync(struct file *file, int datasync)
{
int xid;
int rc = 0;
struct cifsTconInfo *tcon;
struct cifsFileInfo *smbfile = file->private_data;
struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
xid = GetXid();
cFYI(1, "Sync file - name: %s datasync: 0x%x",
file->f_path.dentry->d_name.name, datasync);
tcon = tlink_tcon(smbfile->tlink);
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC))
rc = CIFSSMBFlush(xid, tcon, smbfile->netfid);
FreeXid(xid);
return rc;

8
fs/cifs/inode.c
View File

@ -44,13 +44,17 @@ static void cifs_set_ops(struct inode *inode)
inode->i_fop = &cifs_file_direct_nobrl_ops;
else
inode->i_fop = &cifs_file_direct_ops;
} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
inode->i_fop = &cifs_file_strict_nobrl_ops;
else
inode->i_fop = &cifs_file_strict_ops;
} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
inode->i_fop = &cifs_file_nobrl_ops;
else { /* not direct, send byte range locks */
inode->i_fop = &cifs_file_ops;
}
/* check if server can support readpages */
if (cifs_sb_master_tcon(cifs_sb)->ses->server->maxBuf <
PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
@ -1679,7 +1683,7 @@ cifs_inode_needs_reval(struct inode *inode)
/*
* Zap the cache. Called when invalid_mapping flag is set.
*/
static void
void
cifs_invalidate_mapping(struct inode *inode)
{
int rc;