if (file->f_path.dentry->d_inode->i_mapping) {
/* BB no need to lock inode until after invalidate
since namei code should already have it locked? */
- filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping);
+ rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping);
+ if (rc != 0)
+ CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc;
}
cFYI(1, ("invalidating remote inode since open detected it "
"changed"));
full_path, inode->i_sb, xid);
else
rc = cifs_get_inode_info(&file->f_path.dentry->d_inode,
- full_path, buf, inode->i_sb, xid);
+ full_path, buf, inode->i_sb, xid, NULL);
if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) {
pCifsInode->clientCanCacheAll = TRUE;
int disposition = FILE_OPEN;
__u16 netfid;
- if (file->private_data) {
+ if (file->private_data)
pCifsFile = (struct cifsFileInfo *)file->private_data;
- } else
+ else
return -EBADF;
xid = GetXid();
pCifsInode = CIFS_I(inode);
if (pCifsInode) {
if (can_flush) {
- filemap_write_and_wait(inode->i_mapping);
+ rc = filemap_write_and_wait(inode->i_mapping);
+ if (rc != 0)
+ CIFS_I(inode)->write_behind_rc = rc;
/* temporarily disable caching while we
go to server to get inode info */
pCifsInode->clientCanCacheAll = FALSE;
else
rc = cifs_get_inode_info(&inode,
full_path, NULL, inode->i_sb,
- xid);
+ xid, NULL);
} /* else we are writing out data to server already
and could deadlock if we tried to flush data, and
since we do not know if we have data that would
int cifs_close(struct inode *inode, struct file *file)
{
int rc = 0;
- int xid;
+ int xid, timeout;
struct cifs_sb_info *cifs_sb;
struct cifsTconInfo *pTcon;
struct cifsFileInfo *pSMBFile =
/* no sense reconnecting to close a file that is
already closed */
if (pTcon->tidStatus != CifsNeedReconnect) {
- int timeout = 2;
+ timeout = 2;
while ((atomic_read(&pSMBFile->wrtPending) != 0)
- && (timeout < 1000) ) {
+ && (timeout <= 2048)) {
/* Give write a better chance to get to
server ahead of the close. We do not
want to add a wait_q here as it would
the struct would be in each open file,
but this should give enough time to
clear the socket */
-#ifdef CONFIG_CIFS_DEBUG2
- cFYI(1, ("close delay, write pending"));
-#endif /* DEBUG2 */
+ cFYI(DBG2,
+ ("close delay, write pending"));
msleep(timeout);
timeout *= 4;
}
list_del(&pSMBFile->flist);
list_del(&pSMBFile->tlist);
write_unlock(&GlobalSMBSeslock);
+ timeout = 10;
+ /* We waited above to give the SMBWrite a chance to issue
+ on the wire (so we do not get SMBWrite returning EBADF
+ if writepages is racing with close. Note that writepages
+ does not specify a file handle, so it is possible for a file
+ to be opened twice, and the application close the "wrong"
+ file handle - in these cases we delay long enough to allow
+ the SMBWrite to get on the wire before the SMB Close.
+ We allow total wait here over 45 seconds, more than
+ oplock break time, and more than enough to allow any write
+ to complete on the server, or to time out on the client */
+ while ((atomic_read(&pSMBFile->wrtPending) != 0)
+ && (timeout <= 50000)) {
+ cERROR(1, ("writes pending, delay free of handle"));
+ msleep(timeout);
+ timeout *= 8;
+ }
kfree(pSMBFile->search_resume_name);
kfree(file->private_data);
file->private_data = NULL;
} else
rc = -EBADF;
+ read_lock(&GlobalSMBSeslock);
if (list_empty(&(CIFS_I(inode)->openFileList))) {
cFYI(1, ("closing last open instance for inode %p", inode));
/* if the file is not open we do not know if we can cache info
CIFS_I(inode)->clientCanCacheRead = FALSE;
CIFS_I(inode)->clientCanCacheAll = FALSE;
}
+ read_unlock(&GlobalSMBSeslock);
if ((rc == 0) && CIFS_I(inode)->write_behind_rc)
rc = CIFS_I(inode)->write_behind_rc;
FreeXid(xid);
mutex_lock(&fid->lock_mutex);
list_for_each_entry_safe(li, tmp, &fid->llist, llist) {
if (pfLock->fl_start <= li->offset &&
- (pflock->fl_start + length) >=
+ (pfLock->fl_start + length) >=
(li->offset + li->length)) {
stored_rc = CIFSSMBLock(xid, pTcon,
netfid,
xid = GetXid();
if (*poffset > file->f_path.dentry->d_inode->i_size)
- long_op = 2; /* writes past end of file can take a long time */
+ long_op = CIFS_VLONG_OP; /* writes past EOF take long time */
else
- long_op = 1;
+ long_op = CIFS_LONG_OP;
for (total_written = 0; write_size > total_written;
total_written += bytes_written) {
}
} else
*poffset += bytes_written;
- long_op = FALSE; /* subsequent writes fast -
+ long_op = CIFS_STD_OP; /* subsequent writes fast -
15 seconds is plenty */
}
xid = GetXid();
if (*poffset > file->f_path.dentry->d_inode->i_size)
- long_op = 2; /* writes past end of file can take a long time */
+ long_op = CIFS_VLONG_OP; /* writes past EOF can be slow */
else
- long_op = 1;
+ long_op = CIFS_LONG_OP;
for (total_written = 0; write_size > total_written;
total_written += bytes_written) {
}
} else
*poffset += bytes_written;
- long_op = FALSE; /* subsequent writes fast -
+ long_op = CIFS_STD_OP; /* subsequent writes fast -
15 seconds is plenty */
}
return total_written;
}
+#ifdef CONFIG_CIFS_EXPERIMENTAL
+struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode)
+{
+ struct cifsFileInfo *open_file = NULL;
+
+ read_lock(&GlobalSMBSeslock);
+ /* we could simply get the first_list_entry since write-only entries
+ are always at the end of the list but since the first entry might
+ have a close pending, we go through the whole list */
+ list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
+ if (open_file->closePend)
+ continue;
+ if (open_file->pfile && ((open_file->pfile->f_flags & O_RDWR) ||
+ (open_file->pfile->f_flags & O_RDONLY))) {
+ if (!open_file->invalidHandle) {
+ /* found a good file */
+ /* lock it so it will not be closed on us */
+ atomic_inc(&open_file->wrtPending);
+ read_unlock(&GlobalSMBSeslock);
+ return open_file;
+ } /* else might as well continue, and look for
+ another, or simply have the caller reopen it
+ again rather than trying to fix this handle */
+ } else /* write only file */
+ break; /* write only files are last so must be done */
+ }
+ read_unlock(&GlobalSMBSeslock);
+ return NULL;
+}
+#endif
+
struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode)
{
struct cifsFileInfo *open_file;
}
read_lock(&GlobalSMBSeslock);
+refind_writable:
list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
if (open_file->closePend)
continue;
((open_file->pfile->f_flags & O_RDWR) ||
(open_file->pfile->f_flags & O_WRONLY))) {
atomic_inc(&open_file->wrtPending);
+
+ if (!open_file->invalidHandle) {
+ /* found a good writable file */
+ read_unlock(&GlobalSMBSeslock);
+ return open_file;
+ }
+
read_unlock(&GlobalSMBSeslock);
- if ((open_file->invalidHandle) &&
- (!open_file->closePend) /* BB fixme -since the second clause can not be true remove it BB */) {
- rc = cifs_reopen_file(open_file->pfile, FALSE);
- /* if it fails, try another handle - might be */
- /* dangerous to hold up writepages with retry */
- if (rc) {
- cFYI(1,
- ("failed on reopen file in wp"));
+ /* Had to unlock since following call can block */
+ rc = cifs_reopen_file(open_file->pfile, FALSE);
+ if (!rc) {
+ if (!open_file->closePend)
+ return open_file;
+ else { /* start over in case this was deleted */
+ /* since the list could be modified */
read_lock(&GlobalSMBSeslock);
- /* can not use this handle, no write
- pending on this one after all */
- atomic_dec
- (&open_file->wrtPending);
- continue;
+ atomic_dec(&open_file->wrtPending);
+ goto refind_writable;
}
}
- return open_file;
+
+ /* if it fails, try another handle if possible -
+ (we can not do this if closePending since
+ loop could be modified - in which case we
+ have to start at the beginning of the list
+ again. Note that it would be bad
+ to hold up writepages here (rather than
+ in caller) with continuous retries */
+ cFYI(1, ("wp failed on reopen file"));
+ read_lock(&GlobalSMBSeslock);
+ /* can not use this handle, no write
+ pending on this one after all */
+ atomic_dec(&open_file->wrtPending);
+
+ if (open_file->closePend) /* list could have changed */
+ goto refind_writable;
+ /* else we simply continue to the next entry. Thus
+ we do not loop on reopen errors. If we
+ can not reopen the file, for example if we
+ reconnected to a server with another client
+ racing to delete or lock the file we would not
+ make progress if we restarted before the beginning
+ of the loop here. */
}
}
read_unlock(&GlobalSMBSeslock);
atomic_dec(&open_file->wrtPending);
/* Does mm or vfs already set times? */
inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb);
- if ((bytes_written > 0) && (offset)) {
+ if ((bytes_written > 0) && (offset))
rc = 0;
- } else if (bytes_written < 0) {
- if (rc != -EBADF)
- rc = bytes_written;
- }
+ else if (bytes_written < 0)
+ rc = bytes_written;
} else {
cFYI(1, ("No writeable filehandles for inode"));
rc = -EIO;
open_file->netfid,
bytes_to_write, offset,
&bytes_written, iov, n_iov,
- 1);
+ CIFS_LONG_OP);
atomic_dec(&open_file->wrtPending);
if (rc || bytes_written < bytes_to_write) {
cERROR(1, ("Write2 ret %d, wrote %d",
rc, bytes_written));
/* BB what if continued retry is
requested via mount flags? */
- set_bit(AS_EIO, &mapping->flags);
+ if (rc == -ENOSPC)
+ set_bit(AS_ENOSPC, &mapping->flags);
+ else
+ set_bit(AS_EIO, &mapping->flags);
} else {
cifs_stats_bytes_written(cifs_sb->tcon,
bytes_written);
xid = GetXid();
/* BB add check for wbc flags */
page_cache_get(page);
- if (!PageUptodate(page)) {
+ if (!PageUptodate(page))
cFYI(1, ("ppw - page not up to date"));
- }
/*
* Set the "writeback" flag, and clear "dirty" in the radix tree.
cFYI(1, ("commit write for page %p up to position %lld for %d",
page, position, to));
spin_lock(&inode->i_lock);
- if (position > inode->i_size) {
+ if (position > inode->i_size)
i_size_write(inode, position);
- }
+
spin_unlock(&inode->i_lock);
if (!PageUptodate(page)) {
position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + offset;
cFYI(1, ("Sync file - name: %s datasync: 0x%x",
dentry->d_name.name, datasync));
- rc = filemap_fdatawrite(inode->i_mapping);
- if (rc == 0)
+ rc = filemap_write_and_wait(inode->i_mapping);
+ if (rc == 0) {
+ rc = CIFS_I(inode)->write_behind_rc;
CIFS_I(inode)->write_behind_rc = 0;
+ }
FreeXid(xid);
return rc;
}
filemapfdatawrite appears easier for the time being */
rc = filemap_fdatawrite(inode->i_mapping);
- if (!rc) /* reset wb rc if we were able to write out dirty pages */
+ /* reset wb rc if we were able to write out dirty pages */
+ if (!rc) {
+ rc = CIFS_I(inode)->write_behind_rc;
CIFS_I(inode)->write_behind_rc = 0;
+ }
cFYI(1, ("Flush inode %p file %p rc %d", inode, file, rc));
}
open_file = (struct cifsFileInfo *)file->private_data;
- if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
+ if ((file->f_flags & O_ACCMODE) == O_WRONLY)
cFYI(1, ("attempting read on write only file instance"));
- }
+
for (total_read = 0, current_offset = read_data;
read_size > total_read;
total_read += bytes_read, current_offset += bytes_read) {
smb_read_data +
4 /* RFC1001 length field */ +
le16_to_cpu(pSMBr->DataOffset),
- bytes_read)) {
+ bytes_read))
rc = -EFAULT;
- }
if (buf_type == CIFS_SMALL_BUFFER)
cifs_small_buf_release(smb_read_data);
struct page *page;
struct cifs_sb_info *cifs_sb;
struct cifsTconInfo *pTcon;
- int bytes_read = 0;
+ unsigned int bytes_read = 0;
unsigned int read_size, i;
char *smb_read_data = NULL;
struct smb_com_read_rsp *pSMBr;
pTcon = cifs_sb->tcon;
pagevec_init(&lru_pvec, 0);
-#ifdef CONFIG_CIFS_DEBUG2
- cFYI(1, ("rpages: num pages %d", num_pages));
-#endif
+ cFYI(DBG2, ("rpages: num pages %d", num_pages));
for (i = 0; i < num_pages; ) {
unsigned contig_pages;
struct page *tmp_page;
/* Read size needs to be in multiples of one page */
read_size = min_t(const unsigned int, read_size,
cifs_sb->rsize & PAGE_CACHE_MASK);
-#ifdef CONFIG_CIFS_DEBUG2
- cFYI(1, ("rpages: read size 0x%x contiguous pages %d",
+ cFYI(DBG2, ("rpages: read size 0x%x contiguous pages %d",
read_size, contig_pages));
-#endif
rc = -EAGAIN;
while (rc == -EAGAIN) {
if ((open_file->invalidHandle) &&
i += bytes_read >> PAGE_CACHE_SHIFT;
cifs_stats_bytes_read(pTcon, bytes_read);
- if ((int)(bytes_read & PAGE_CACHE_MASK) != bytes_read) {
+ if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) {
i++; /* account for partial page */
/* server copy of file can have smaller size
struct cifs_sb_info *cifs_sb;
cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb);
- if ( cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO ) {
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
/* since no page cache to corrupt on directio
we can change size safely */
return 1;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff