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-rw-r--r--fs/cifs/file.c206
1 files changed, 128 insertions, 78 deletions
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index edb25b4bbb95..0a6677ba212b 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -505,16 +505,36 @@ out:
return rc;
}
+static int cifs_push_posix_locks(struct cifsFileInfo *cfile);
+
/*
* Try to reacquire byte range locks that were released when session
- * to server was lost
+ * to server was lost.
*/
-static int cifs_relock_file(struct cifsFileInfo *cifsFile)
+static int
+cifs_relock_file(struct cifsFileInfo *cfile)
{
+ struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb);
+ struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
+ struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
int rc = 0;
- /* BB list all locks open on this file and relock */
+ /* we are going to update can_cache_brlcks here - need a write access */
+ down_write(&cinode->lock_sem);
+ if (cinode->can_cache_brlcks) {
+ /* can cache locks - no need to push them */
+ up_write(&cinode->lock_sem);
+ return rc;
+ }
+ if (cap_unix(tcon->ses) &&
+ (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
+ ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
+ rc = cifs_push_posix_locks(cfile);
+ else
+ rc = tcon->ses->server->ops->push_mand_locks(cfile);
+
+ up_write(&cinode->lock_sem);
return rc;
}
@@ -739,10 +759,15 @@ cifs_del_lock_waiters(struct cifsLockInfo *lock)
}
}
+#define CIFS_LOCK_OP 0
+#define CIFS_READ_OP 1
+#define CIFS_WRITE_OP 2
+
+/* @rw_check : 0 - no op, 1 - read, 2 - write */
static bool
cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset,
__u64 length, __u8 type, struct cifsFileInfo *cfile,
- struct cifsLockInfo **conf_lock, bool rw_check)
+ struct cifsLockInfo **conf_lock, int rw_check)
{
struct cifsLockInfo *li;
struct cifsFileInfo *cur_cfile = fdlocks->cfile;
@@ -752,9 +777,13 @@ cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset,
if (offset + length <= li->offset ||
offset >= li->offset + li->length)
continue;
- if (rw_check && server->ops->compare_fids(cfile, cur_cfile) &&
- current->tgid == li->pid)
- continue;
+ if (rw_check != CIFS_LOCK_OP && current->tgid == li->pid &&
+ server->ops->compare_fids(cfile, cur_cfile)) {
+ /* shared lock prevents write op through the same fid */
+ if (!(li->type & server->vals->shared_lock_type) ||
+ rw_check != CIFS_WRITE_OP)
+ continue;
+ }
if ((type & server->vals->shared_lock_type) &&
((server->ops->compare_fids(cfile, cur_cfile) &&
current->tgid == li->pid) || type == li->type))
@@ -769,7 +798,7 @@ cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset,
bool
cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length,
__u8 type, struct cifsLockInfo **conf_lock,
- bool rw_check)
+ int rw_check)
{
bool rc = false;
struct cifs_fid_locks *cur;
@@ -805,7 +834,7 @@ cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length,
down_read(&cinode->lock_sem);
exist = cifs_find_lock_conflict(cfile, offset, length, type,
- &conf_lock, false);
+ &conf_lock, CIFS_LOCK_OP);
if (exist) {
flock->fl_start = conf_lock->offset;
flock->fl_end = conf_lock->offset + conf_lock->length - 1;
@@ -852,7 +881,7 @@ try_again:
down_write(&cinode->lock_sem);
exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length,
- lock->type, &conf_lock, false);
+ lock->type, &conf_lock, CIFS_LOCK_OP);
if (!exist && cinode->can_cache_brlcks) {
list_add_tail(&lock->llist, &cfile->llist->locks);
up_write(&cinode->lock_sem);
@@ -948,7 +977,6 @@ cifs_push_mandatory_locks(struct cifsFileInfo *cfile)
int rc = 0, stored_rc;
struct cifsLockInfo *li, *tmp;
struct cifs_tcon *tcon;
- struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
unsigned int num, max_num, max_buf;
LOCKING_ANDX_RANGE *buf, *cur;
int types[] = {LOCKING_ANDX_LARGE_FILES,
@@ -958,21 +986,12 @@ cifs_push_mandatory_locks(struct cifsFileInfo *cfile)
xid = get_xid();
tcon = tlink_tcon(cfile->tlink);
- /* we are going to update can_cache_brlcks here - need a write access */
- down_write(&cinode->lock_sem);
- if (!cinode->can_cache_brlcks) {
- up_write(&cinode->lock_sem);
- free_xid(xid);
- return rc;
- }
-
/*
* Accessing maxBuf is racy with cifs_reconnect - need to store value
* and check it for zero before using.
*/
max_buf = tcon->ses->server->maxBuf;
if (!max_buf) {
- up_write(&cinode->lock_sem);
free_xid(xid);
return -EINVAL;
}
@@ -981,7 +1000,6 @@ cifs_push_mandatory_locks(struct cifsFileInfo *cfile)
sizeof(LOCKING_ANDX_RANGE);
buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL);
if (!buf) {
- up_write(&cinode->lock_sem);
free_xid(xid);
return -ENOMEM;
}
@@ -1018,9 +1036,6 @@ cifs_push_mandatory_locks(struct cifsFileInfo *cfile)
}
}
- cinode->can_cache_brlcks = false;
- up_write(&cinode->lock_sem);
-
kfree(buf);
free_xid(xid);
return rc;
@@ -1043,7 +1058,6 @@ struct lock_to_push {
static int
cifs_push_posix_locks(struct cifsFileInfo *cfile)
{
- struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
struct file_lock *flock, **before;
unsigned int count = 0, i = 0;
@@ -1054,14 +1068,6 @@ cifs_push_posix_locks(struct cifsFileInfo *cfile)
xid = get_xid();
- /* we are going to update can_cache_brlcks here - need a write access */
- down_write(&cinode->lock_sem);
- if (!cinode->can_cache_brlcks) {
- up_write(&cinode->lock_sem);
- free_xid(xid);
- return rc;
- }
-
lock_flocks();
cifs_for_each_lock(cfile->dentry->d_inode, before) {
if ((*before)->fl_flags & FL_POSIX)
@@ -1127,9 +1133,6 @@ cifs_push_posix_locks(struct cifsFileInfo *cfile)
}
out:
- cinode->can_cache_brlcks = false;
- up_write(&cinode->lock_sem);
-
free_xid(xid);
return rc;
err_out:
@@ -1144,14 +1147,27 @@ static int
cifs_push_locks(struct cifsFileInfo *cfile)
{
struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb);
+ struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
+ int rc = 0;
+
+ /* we are going to update can_cache_brlcks here - need a write access */
+ down_write(&cinode->lock_sem);
+ if (!cinode->can_cache_brlcks) {
+ up_write(&cinode->lock_sem);
+ return rc;
+ }
if (cap_unix(tcon->ses) &&
(CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
- return cifs_push_posix_locks(cfile);
+ rc = cifs_push_posix_locks(cfile);
+ else
+ rc = tcon->ses->server->ops->push_mand_locks(cfile);
- return tcon->ses->server->ops->push_mand_locks(cfile);
+ cinode->can_cache_brlcks = false;
+ up_write(&cinode->lock_sem);
+ return rc;
}
static void
@@ -1436,16 +1452,18 @@ cifs_setlk(struct file *file, struct file_lock *flock, __u32 type,
return -ENOMEM;
rc = cifs_lock_add_if(cfile, lock, wait_flag);
- if (rc < 0)
+ if (rc < 0) {
kfree(lock);
- if (rc <= 0)
+ return rc;
+ }
+ if (!rc)
goto out;
rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
type, 1, 0, wait_flag);
if (rc) {
kfree(lock);
- goto out;
+ return rc;
}
cifs_lock_add(cfile, lock);
@@ -1794,7 +1812,6 @@ static int cifs_writepages(struct address_space *mapping,
struct TCP_Server_Info *server;
struct page *page;
int rc = 0;
- loff_t isize = i_size_read(mapping->host);
/*
* If wsize is smaller than the page cache size, default to writing
@@ -1899,7 +1916,7 @@ retry:
*/
set_page_writeback(page);
- if (page_offset(page) >= isize) {
+ if (page_offset(page) >= i_size_read(mapping->host)) {
done = true;
unlock_page(page);
end_page_writeback(page);
@@ -1932,7 +1949,8 @@ retry:
wdata->offset = page_offset(wdata->pages[0]);
wdata->pagesz = PAGE_CACHE_SIZE;
wdata->tailsz =
- min(isize - page_offset(wdata->pages[nr_pages - 1]),
+ min(i_size_read(mapping->host) -
+ page_offset(wdata->pages[nr_pages - 1]),
(loff_t)PAGE_CACHE_SIZE);
wdata->bytes = ((nr_pages - 1) * PAGE_CACHE_SIZE) +
wdata->tailsz;
@@ -2085,7 +2103,15 @@ static int cifs_write_end(struct file *file, struct address_space *mapping,
} else {
rc = copied;
pos += copied;
- set_page_dirty(page);
+ /*
+ * When we use strict cache mode and cifs_strict_writev was run
+ * with level II oplock (indicated by leave_pages_clean field of
+ * CIFS_I(inode)), we can leave pages clean - cifs_strict_writev
+ * sent the data to the server itself.
+ */
+ if (!CIFS_I(inode)->leave_pages_clean ||
+ !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO))
+ set_page_dirty(page);
}
if (rc > 0) {
@@ -2436,8 +2462,8 @@ ssize_t cifs_user_writev(struct kiocb *iocb, const struct iovec *iov,
}
static ssize_t
-cifs_writev(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, loff_t pos)
+cifs_pagecache_writev(struct kiocb *iocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos, bool cache_ex)
{
struct file *file = iocb->ki_filp;
struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
@@ -2457,10 +2483,14 @@ cifs_writev(struct kiocb *iocb, const struct iovec *iov,
down_read(&cinode->lock_sem);
if (!cifs_find_lock_conflict(cfile, pos, iov_length(iov, nr_segs),
server->vals->exclusive_lock_type, NULL,
- true)) {
+ CIFS_WRITE_OP)) {
mutex_lock(&inode->i_mutex);
+ if (!cache_ex)
+ cinode->leave_pages_clean = true;
rc = __generic_file_aio_write(iocb, iov, nr_segs,
- &iocb->ki_pos);
+ &iocb->ki_pos);
+ if (!cache_ex)
+ cinode->leave_pages_clean = false;
mutex_unlock(&inode->i_mutex);
}
@@ -2487,42 +2517,62 @@ cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov,
struct cifsFileInfo *cfile = (struct cifsFileInfo *)
iocb->ki_filp->private_data;
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
-
-#ifdef CONFIG_CIFS_SMB2
+ ssize_t written, written2;
/*
- * If we have an oplock for read and want to write a data to the file
- * we need to store it in the page cache and then push it to the server
- * to be sure the next read will get a valid data.
+ * We need to store clientCanCacheAll here to prevent race
+ * conditions - this value can be changed during an execution
+ * of generic_file_aio_write. For CIFS it can be changed from
+ * true to false only, but for SMB2 it can be changed both from
+ * true to false and vice versa. So, we can end up with a data
+ * stored in the cache, not marked dirty and not sent to the
+ * server if this value changes its state from false to true
+ * after cifs_write_end.
*/
- if (!cinode->clientCanCacheAll && cinode->clientCanCacheRead) {
- ssize_t written;
- int rc;
-
- written = generic_file_aio_write(iocb, iov, nr_segs, pos);
- rc = filemap_fdatawrite(inode->i_mapping);
- if (rc)
- return (ssize_t)rc;
+ bool cache_ex = cinode->clientCanCacheAll;
+ bool cache_read = cinode->clientCanCacheRead;
+ int rc;
+ loff_t saved_pos;
- return written;
+ if (cache_ex) {
+ if (cap_unix(tcon->ses) &&
+ ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0) &&
+ (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(
+ tcon->fsUnixInfo.Capability)))
+ return generic_file_aio_write(iocb, iov, nr_segs, pos);
+ return cifs_pagecache_writev(iocb, iov, nr_segs, pos, cache_ex);
}
-#endif
/*
- * For non-oplocked files in strict cache mode we need to write the data
- * to the server exactly from the pos to pos+len-1 rather than flush all
- * affected pages because it may cause a error with mandatory locks on
- * these pages but not on the region from pos to ppos+len-1.
+ * For files without exclusive oplock in strict cache mode we need to
+ * write the data to the server exactly from the pos to pos+len-1 rather
+ * than flush all affected pages because it may cause a error with
+ * mandatory locks on these pages but not on the region from pos to
+ * ppos+len-1.
*/
+ written = cifs_user_writev(iocb, iov, nr_segs, pos);
+ if (!cache_read || written <= 0)
+ return written;
- if (!cinode->clientCanCacheAll)
- return cifs_user_writev(iocb, iov, nr_segs, pos);
-
+ saved_pos = iocb->ki_pos;
+ iocb->ki_pos = pos;
+ /* we have a read oplock - need to store a data in the page cache */
if (cap_unix(tcon->ses) &&
- (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
- ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
- return generic_file_aio_write(iocb, iov, nr_segs, pos);
-
- return cifs_writev(iocb, iov, nr_segs, pos);
+ ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0) &&
+ (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(
+ tcon->fsUnixInfo.Capability)))
+ written2 = generic_file_aio_write(iocb, iov, nr_segs, pos);
+ else
+ written2 = cifs_pagecache_writev(iocb, iov, nr_segs, pos,
+ cache_ex);
+ /* errors occured during writing - invalidate the page cache */
+ if (written2 < 0) {
+ rc = cifs_invalidate_mapping(inode);
+ if (rc)
+ written = (ssize_t)rc;
+ else
+ iocb->ki_pos = saved_pos;
+ }
+ return written;
}
static struct cifs_readdata *
@@ -2892,7 +2942,7 @@ cifs_strict_readv(struct kiocb *iocb, const struct iovec *iov,
down_read(&cinode->lock_sem);
if (!cifs_find_lock_conflict(cfile, pos, iov_length(iov, nr_segs),
tcon->ses->server->vals->shared_lock_type,
- NULL, true))
+ NULL, CIFS_READ_OP))
rc = generic_file_aio_read(iocb, iov, nr_segs, pos);
up_read(&cinode->lock_sem);
return rc;
@@ -3536,7 +3586,7 @@ void cifs_oplock_break(struct work_struct *work)
if (cinode->clientCanCacheRead == 0) {
rc = filemap_fdatawait(inode->i_mapping);
mapping_set_error(inode->i_mapping, rc);
- invalidate_remote_inode(inode);
+ cifs_invalidate_mapping(inode);
}
cFYI(1, "Oplock flush inode %p rc %d", inode, rc);
}