diff options
Diffstat (limited to 'fs/cifs/cifsfs.c')
| -rw-r--r-- | fs/cifs/cifsfs.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index 84cc011a16e4..ac5915d61dca 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -312,6 +312,7 @@ cifs_alloc_inode(struct super_block *sb) file data or metadata */ cifs_inode->clientCanCacheRead = false; cifs_inode->clientCanCacheAll = false; + cifs_inode->delete_pending = false; cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */ /* Can not set i_flags here - they get immediately overwritten @@ -620,6 +621,37 @@ static loff_t cifs_llseek(struct file *file, loff_t offset, int origin) return generic_file_llseek_unlocked(file, offset, origin); } +#ifdef CONFIG_CIFS_EXPERIMENTAL +static int cifs_setlease(struct file *file, long arg, struct file_lock **lease) +{ + /* note that this is called by vfs setlease with the BKL held + although I doubt that BKL is needed here in cifs */ + struct inode *inode = file->f_path.dentry->d_inode; + + if (!(S_ISREG(inode->i_mode))) + return -EINVAL; + + /* check if file is oplocked */ + if (((arg == F_RDLCK) && + (CIFS_I(inode)->clientCanCacheRead)) || + ((arg == F_WRLCK) && + (CIFS_I(inode)->clientCanCacheAll))) + return generic_setlease(file, arg, lease); + else if (CIFS_SB(inode->i_sb)->tcon->local_lease && + !CIFS_I(inode)->clientCanCacheRead) + /* If the server claims to support oplock on this + file, then we still need to check oplock even + if the local_lease mount option is set, but there + are servers which do not support oplock for which + this mount option may be useful if the user + knows that the file won't be changed on the server + by anyone else */ + return generic_setlease(file, arg, lease); + else + return -EAGAIN; +} +#endif + struct file_system_type cifs_fs_type = { .owner = THIS_MODULE, .name = "cifs", @@ -698,6 +730,7 @@ const struct file_operations cifs_file_ops = { #ifdef CONFIG_CIFS_EXPERIMENTAL .dir_notify = cifs_dir_notify, + .setlease = cifs_setlease, #endif /* CONFIG_CIFS_EXPERIMENTAL */ }; @@ -718,6 +751,7 @@ const struct file_operations cifs_file_direct_ops = { .llseek = cifs_llseek, #ifdef CONFIG_CIFS_EXPERIMENTAL .dir_notify = cifs_dir_notify, + .setlease = cifs_setlease, #endif /* CONFIG_CIFS_EXPERIMENTAL */ }; const struct file_operations cifs_file_nobrl_ops = { @@ -738,6 +772,7 @@ const struct file_operations cifs_file_nobrl_ops = { #ifdef CONFIG_CIFS_EXPERIMENTAL .dir_notify = cifs_dir_notify, + .setlease = cifs_setlease, #endif /* CONFIG_CIFS_EXPERIMENTAL */ }; @@ -757,6 +792,7 @@ const struct file_operations cifs_file_direct_nobrl_ops = { .llseek = cifs_llseek, #ifdef CONFIG_CIFS_EXPERIMENTAL .dir_notify = cifs_dir_notify, + .setlease = cifs_setlease, #endif /* CONFIG_CIFS_EXPERIMENTAL */ }; @@ -949,6 +985,12 @@ static int cifs_oplock_thread(void *dummyarg) the call */ /* mutex_lock(&inode->i_mutex);*/ if (S_ISREG(inode->i_mode)) { +#ifdef CONFIG_CIFS_EXPERIMENTAL + if (CIFS_I(inode)->clientCanCacheAll == 0) + break_lease(inode, FMODE_READ); + else if (CIFS_I(inode)->clientCanCacheRead == 0) + break_lease(inode, FMODE_WRITE); +#endif rc = filemap_fdatawrite(inode->i_mapping); if (CIFS_I(inode)->clientCanCacheRead == 0) { waitrc = filemap_fdatawait( |