* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/fs.h>
+#include <linux/backing-dev.h>
#include <linux/stat.h>
#include <linux/fcntl.h>
+#include <linux/mpage.h>
#include <linux/pagemap.h>
#include <linux/pagevec.h>
#include <linux/smp_lock.h>
+#include <linux/writeback.h>
+#include <linux/delay.h>
#include <asm/div64.h>
#include "cifsfs.h"
#include "cifspdu.h"
private_data->pInode = inode;
private_data->invalidHandle = FALSE;
private_data->closePend = FALSE;
+ /* we have to track num writers to the inode, since writepages
+ does not tell us which handle the write is for so there can
+ be a close (overlapping with write) of the filehandle that
+ cifs_writepages chose to use */
+ atomic_set(&private_data->wrtPending,0);
return private_data;
}
return FILE_OVERWRITE_IF;
else if ((flags & O_CREAT) == O_CREAT)
return FILE_OPEN_IF;
+ else if ((flags & O_TRUNC) == O_TRUNC)
+ return FILE_OVERWRITE;
else
return FILE_OPEN;
}
if (file->f_dentry->d_inode->i_mapping) {
/* BB no need to lock inode until after invalidate
since namei code should already have it locked? */
- filemap_fdatawrite(file->f_dentry->d_inode->i_mapping);
- filemap_fdatawait(file->f_dentry->d_inode->i_mapping);
+ filemap_write_and_wait(file->f_dentry->d_inode->i_mapping);
}
cFYI(1, ("invalidating remote inode since open detected it "
"changed"));
}
}
- down(&inode->i_sb->s_vfs_rename_sem);
full_path = build_path_from_dentry(file->f_dentry);
- up(&inode->i_sb->s_vfs_rename_sem);
if (full_path == NULL) {
FreeXid(xid);
return -ENOMEM;
CREATE_NOT_DIR, &netfid, &oplock, buf,
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
& CIFS_MOUNT_MAP_SPECIAL_CHR);
+ if (rc == -EIO) {
+ /* Old server, try legacy style OpenX */
+ rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
+ desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf,
+ cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
+ & CIFS_MOUNT_MAP_SPECIAL_CHR);
+ }
if (rc) {
cFYI(1, ("cifs_open returned 0x%x ", rc));
goto out;
pCifsInode = CIFS_I(inode);
if (pCifsInode) {
if (can_flush) {
- filemap_fdatawrite(inode->i_mapping);
- filemap_fdatawait(inode->i_mapping);
+ filemap_write_and_wait(inode->i_mapping);
/* temporarily disable caching while we
go to server to get inode info */
pCifsInode->clientCanCacheAll = FALSE;
/* no sense reconnecting to close a file that is
already closed */
if (pTcon->tidStatus != CifsNeedReconnect) {
+ int timeout = 2;
+ while((atomic_read(&pSMBFile->wrtPending) != 0)
+ && (timeout < 1000) ) {
+ /* 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
+ increase the memory utilization as
+ the struct would be in each open file,
+ but this should give enough time to
+ clear the socket */
+ write_unlock(&file->f_owner.lock);
+ cERROR(1,("close with pending writes"));
+ msleep(timeout);
+ write_lock(&file->f_owner.lock);
+ timeout *= 4;
+ }
write_unlock(&file->f_owner.lock);
rc = CIFSSMBClose(xid, pTcon,
pSMBFile->netfid);
}
ptmp = pCFileStruct->srch_inf.ntwrk_buf_start;
if (ptmp) {
- /* BB removeme BB */ cFYI(1, ("freeing smb buf in srch struct in closedir"));
+ cFYI(1, ("closedir free smb buf in srch struct"));
pCFileStruct->srch_inf.ntwrk_buf_start = NULL;
- cifs_buf_release(ptmp);
+ if(pCFileStruct->srch_inf.smallBuf)
+ cifs_small_buf_release(ptmp);
+ else
+ cifs_buf_release(ptmp);
}
ptmp = pCFileStruct->search_resume_name;
if (ptmp) {
- /* BB removeme BB */ cFYI(1, ("freeing resume name in closedir"));
+ cFYI(1, ("closedir free resume name"));
pCFileStruct->search_resume_name = NULL;
kfree(ptmp);
}
int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
{
int rc, xid;
- __u32 lockType = LOCKING_ANDX_LARGE_FILES;
__u32 numLock = 0;
__u32 numUnlock = 0;
__u64 length;
int wait_flag = FALSE;
struct cifs_sb_info *cifs_sb;
struct cifsTconInfo *pTcon;
+ __u16 netfid;
+ __u8 lockType = LOCKING_ANDX_LARGE_FILES;
length = 1 + pfLock->fl_end - pfLock->fl_start;
rc = -EACCES;
pfLock->fl_end));
if (pfLock->fl_flags & FL_POSIX)
- cFYI(1, ("Posix "));
+ cFYI(1, ("Posix"));
if (pfLock->fl_flags & FL_FLOCK)
- cFYI(1, ("Flock "));
+ cFYI(1, ("Flock"));
if (pfLock->fl_flags & FL_SLEEP) {
- cFYI(1, ("Blocking lock "));
+ cFYI(1, ("Blocking lock"));
wait_flag = TRUE;
}
if (pfLock->fl_flags & FL_ACCESS)
cFYI(1, ("F_WRLCK "));
numLock = 1;
} else if (pfLock->fl_type == F_UNLCK) {
- cFYI(1, ("F_UNLCK "));
+ cFYI(1, ("F_UNLCK"));
numUnlock = 1;
+ /* Check if unlock includes more than
+ one lock range */
} else if (pfLock->fl_type == F_RDLCK) {
- cFYI(1, ("F_RDLCK "));
+ cFYI(1, ("F_RDLCK"));
lockType |= LOCKING_ANDX_SHARED_LOCK;
numLock = 1;
} else if (pfLock->fl_type == F_EXLCK) {
- cFYI(1, ("F_EXLCK "));
+ cFYI(1, ("F_EXLCK"));
numLock = 1;
} else if (pfLock->fl_type == F_SHLCK) {
- cFYI(1, ("F_SHLCK "));
+ cFYI(1, ("F_SHLCK"));
lockType |= LOCKING_ANDX_SHARED_LOCK;
numLock = 1;
} else
- cFYI(1, ("Unknown type of lock "));
+ cFYI(1, ("Unknown type of lock"));
cifs_sb = CIFS_SB(file->f_dentry->d_sb);
pTcon = cifs_sb->tcon;
FreeXid(xid);
return -EBADF;
}
+ netfid = ((struct cifsFileInfo *)file->private_data)->netfid;
+
+ /* BB add code here to normalize offset and length to
+ account for negative length which we can not accept over the
+ wire */
if (IS_GETLK(cmd)) {
- rc = CIFSSMBLock(xid, pTcon,
- ((struct cifsFileInfo *)file->
- private_data)->netfid,
- length,
- pfLock->fl_start, 0, 1, lockType,
- 0 /* wait flag */ );
+ if(experimEnabled &&
+ (cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
+ (CIFS_UNIX_FCNTL_CAP &
+ le64_to_cpu(cifs_sb->tcon->fsUnixInfo.Capability))) {
+ int posix_lock_type;
+ if(lockType & LOCKING_ANDX_SHARED_LOCK)
+ posix_lock_type = CIFS_RDLCK;
+ else
+ posix_lock_type = CIFS_WRLCK;
+ rc = CIFSSMBPosixLock(xid, pTcon, netfid, 1 /* get */,
+ length, pfLock,
+ posix_lock_type, wait_flag);
+ FreeXid(xid);
+ return rc;
+ }
+
+ /* BB we could chain these into one lock request BB */
+ rc = CIFSSMBLock(xid, pTcon, netfid, length, pfLock->fl_start,
+ 0, 1, lockType, 0 /* wait flag */ );
if (rc == 0) {
- rc = CIFSSMBLock(xid, pTcon,
- ((struct cifsFileInfo *) file->
- private_data)->netfid,
- length,
+ rc = CIFSSMBLock(xid, pTcon, netfid, length,
pfLock->fl_start, 1 /* numUnlock */ ,
0 /* numLock */ , lockType,
0 /* wait flag */ );
pfLock->fl_type = F_UNLCK;
if (rc != 0)
cERROR(1, ("Error unlocking previously locked "
- "range %d during test of lock ",
- rc));
+ "range %d during test of lock", rc));
rc = 0;
} else {
FreeXid(xid);
return rc;
}
-
- rc = CIFSSMBLock(xid, pTcon,
- ((struct cifsFileInfo *) file->private_data)->
- netfid, length,
- pfLock->fl_start, numUnlock, numLock, lockType,
- wait_flag);
- if (rc == 0 && (pfLock->fl_flags & FL_POSIX))
+ if (experimEnabled &&
+ (cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
+ (CIFS_UNIX_FCNTL_CAP &
+ le64_to_cpu(cifs_sb->tcon->fsUnixInfo.Capability))) {
+ int posix_lock_type;
+ if(lockType & LOCKING_ANDX_SHARED_LOCK)
+ posix_lock_type = CIFS_RDLCK;
+ else
+ posix_lock_type = CIFS_WRLCK;
+
+ if(numUnlock == 1)
+ posix_lock_type = CIFS_UNLCK;
+ else if(numLock == 0) {
+ /* if no lock or unlock then nothing
+ to do since we do not know what it is */
+ FreeXid(xid);
+ return -EOPNOTSUPP;
+ }
+ rc = CIFSSMBPosixLock(xid, pTcon, netfid, 0 /* set */,
+ length, pfLock,
+ posix_lock_type, wait_flag);
+ } else
+ rc = CIFSSMBLock(xid, pTcon, netfid, length, pfLock->fl_start,
+ numUnlock, numLock, lockType, wait_flag);
+ if (pfLock->fl_flags & FL_POSIX)
posix_lock_file_wait(file, pfLock);
FreeXid(xid);
return rc;
15 seconds is plenty */
}
-#ifdef CONFIG_CIFS_STATS
- if (total_written > 0) {
- atomic_inc(&pTcon->num_writes);
- spin_lock(&pTcon->stat_lock);
- pTcon->bytes_written += total_written;
- spin_unlock(&pTcon->stat_lock);
- }
-#endif
+ cifs_stats_bytes_written(pTcon, total_written);
/* since the write may have blocked check these pointers again */
if (file->f_dentry) {
pTcon = cifs_sb->tcon;
- /* cFYI(1,
- (" write %d bytes to offset %lld of %s", write_size,
- *poffset, file->f_dentry->d_name.name)); */
+ cFYI(1,("write %zd bytes to offset %lld of %s", write_size,
+ *poffset, file->f_dentry->d_name.name));
if (file->private_data == NULL)
return -EBADF;
if (rc != 0)
break;
}
-
- rc = CIFSSMBWrite(xid, pTcon,
- open_file->netfid,
- min_t(const int, cifs_sb->wsize,
- write_size - total_written),
- *poffset, &bytes_written,
- write_data + total_written, NULL, long_op);
+ if(experimEnabled || (pTcon->ses->server &&
+ ((pTcon->ses->server->secMode &
+ (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
+ == 0))) {
+ struct kvec iov[2];
+ unsigned int len;
+
+ len = min((size_t)cifs_sb->wsize,
+ write_size - total_written);
+ /* iov[0] is reserved for smb header */
+ iov[1].iov_base = (char *)write_data +
+ total_written;
+ iov[1].iov_len = len;
+ rc = CIFSSMBWrite2(xid, pTcon,
+ open_file->netfid, len,
+ *poffset, &bytes_written,
+ iov, 1, long_op);
+ } else
+ rc = CIFSSMBWrite(xid, pTcon,
+ open_file->netfid,
+ min_t(const int, cifs_sb->wsize,
+ write_size - total_written),
+ *poffset, &bytes_written,
+ write_data + total_written,
+ NULL, long_op);
}
if (rc || (bytes_written == 0)) {
if (total_written)
15 seconds is plenty */
}
-#ifdef CONFIG_CIFS_STATS
- if (total_written > 0) {
- atomic_inc(&pTcon->num_writes);
- spin_lock(&pTcon->stat_lock);
- pTcon->bytes_written += total_written;
- spin_unlock(&pTcon->stat_lock);
- }
-#endif
+ cifs_stats_bytes_written(pTcon, total_written);
/* since the write may have blocked check these pointers again */
if (file->f_dentry) {
return total_written;
}
+struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode)
+{
+ struct cifsFileInfo *open_file;
+ int rc;
+
+ /* Having a null inode here (because mapping->host was set to zero by
+ the VFS or MM) should not happen but we had reports of on oops (due to
+ it being zero) during stress testcases so we need to check for it */
+
+ if(cifs_inode == NULL) {
+ cERROR(1,("Null inode passed to cifs_writeable_file"));
+ dump_stack();
+ return NULL;
+ }
+
+ read_lock(&GlobalSMBSeslock);
+ 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_WRONLY))) {
+ atomic_inc(&open_file->wrtPending);
+ 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(&cifs_inode->vfs_inode,
+ 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"));
+ read_lock(&GlobalSMBSeslock);
+ /* can not use this handle, no write
+ pending on this one after all */
+ atomic_dec
+ (&open_file->wrtPending);
+ continue;
+ }
+ }
+ return open_file;
+ }
+ }
+ read_unlock(&GlobalSMBSeslock);
+ return NULL;
+}
+
static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
{
struct address_space *mapping = page->mapping;
struct cifs_sb_info *cifs_sb;
struct cifsTconInfo *pTcon;
struct inode *inode;
- struct cifsInodeInfo *cifsInode;
- struct cifsFileInfo *open_file = NULL;
- struct list_head *tmp;
- struct list_head *tmp1;
+ struct cifsFileInfo *open_file;
if (!mapping || !mapping->host)
return -EFAULT;
if (mapping->host->i_size - offset < (loff_t)to)
to = (unsigned)(mapping->host->i_size - offset);
- cifsInode = CIFS_I(mapping->host);
- read_lock(&GlobalSMBSeslock);
- /* BB we should start at the end */
- list_for_each_safe(tmp, tmp1, &cifsInode->openFileList) {
- open_file = list_entry(tmp, struct cifsFileInfo, flist);
- if (open_file->closePend)
- continue;
- /* We check if file is open for writing first */
- if ((open_file->pfile) &&
- ((open_file->pfile->f_flags & O_RDWR) ||
- (open_file->pfile->f_flags & O_WRONLY))) {
- read_unlock(&GlobalSMBSeslock);
- bytes_written = cifs_write(open_file->pfile,
- write_data, to-from,
- &offset);
- read_lock(&GlobalSMBSeslock);
+ open_file = find_writable_file(CIFS_I(mapping->host));
+ if (open_file) {
+ bytes_written = cifs_write(open_file->pfile, write_data,
+ to-from, &offset);
+ 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)) {
- rc = 0;
- } else if (bytes_written < 0) {
- if (rc == -EBADF) {
- /* have seen a case in which kernel seemed to
- have closed/freed a file even with writes
- active so we might as well see if there are
- other file structs to try for the same
- inode before giving up */
- continue;
- } else
- rc = bytes_written;
- }
- break; /* now that we found a valid file handle and
- tried to write to it we are done, no sense
- continuing to loop looking for another */
- }
- if (tmp->next == NULL) {
- cFYI(1, ("File instance %p removed", tmp));
- break;
+ inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb);
+ if ((bytes_written > 0) && (offset)) {
+ rc = 0;
+ } else if (bytes_written < 0) {
+ if (rc != -EBADF)
+ rc = bytes_written;
}
- }
- read_unlock(&GlobalSMBSeslock);
- if (open_file == NULL) {
+ } else {
cFYI(1, ("No writeable filehandles for inode"));
rc = -EIO;
}
return rc;
}
-#if 0
static int cifs_writepages(struct address_space *mapping,
- struct writeback_control *wbc)
+ struct writeback_control *wbc)
{
- int rc = -EFAULT;
+ struct backing_dev_info *bdi = mapping->backing_dev_info;
+ unsigned int bytes_to_write;
+ unsigned int bytes_written;
+ struct cifs_sb_info *cifs_sb;
+ int done = 0;
+ pgoff_t end = -1;
+ pgoff_t index;
+ int is_range = 0;
+ struct kvec iov[32];
+ int len;
+ int n_iov = 0;
+ pgoff_t next;
+ int nr_pages;
+ __u64 offset = 0;
+ struct cifsFileInfo *open_file;
+ struct page *page;
+ struct pagevec pvec;
+ int rc = 0;
+ int scanned = 0;
int xid;
+ cifs_sb = CIFS_SB(mapping->host->i_sb);
+
+ /*
+ * If wsize is smaller that the page cache size, default to writing
+ * one page at a time via cifs_writepage
+ */
+ if (cifs_sb->wsize < PAGE_CACHE_SIZE)
+ return generic_writepages(mapping, wbc);
+
+ if((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server))
+ if(cifs_sb->tcon->ses->server->secMode &
+ (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
+ if(!experimEnabled)
+ return generic_writepages(mapping, wbc);
+
+ /*
+ * BB: Is this meaningful for a non-block-device file system?
+ * If it is, we should test it again after we do I/O
+ */
+ if (wbc->nonblocking && bdi_write_congested(bdi)) {
+ wbc->encountered_congestion = 1;
+ return 0;
+ }
+
xid = GetXid();
- /* Find contiguous pages then iterate through repeating
- call 16K write then Setpageuptodate or if LARGE_WRITE_X
- support then send larger writes via kevec so as to eliminate
- a memcpy */
+ pagevec_init(&pvec, 0);
+ if (wbc->sync_mode == WB_SYNC_NONE)
+ index = mapping->writeback_index; /* Start from prev offset */
+ else {
+ index = 0;
+ scanned = 1;
+ }
+ if (wbc->start || wbc->end) {
+ index = wbc->start >> PAGE_CACHE_SHIFT;
+ end = wbc->end >> PAGE_CACHE_SHIFT;
+ is_range = 1;
+ scanned = 1;
+ }
+retry:
+ while (!done && (index <= end) &&
+ (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
+ PAGECACHE_TAG_DIRTY,
+ min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) {
+ int first;
+ unsigned int i;
+
+ first = -1;
+ next = 0;
+ n_iov = 0;
+ bytes_to_write = 0;
+
+ for (i = 0; i < nr_pages; i++) {
+ page = pvec.pages[i];
+ /*
+ * At this point we hold neither mapping->tree_lock nor
+ * lock on the page itself: the page may be truncated or
+ * invalidated (changing page->mapping to NULL), or even
+ * swizzled back from swapper_space to tmpfs file
+ * mapping
+ */
+
+ if (first < 0)
+ lock_page(page);
+ else if (TestSetPageLocked(page))
+ break;
+
+ if (unlikely(page->mapping != mapping)) {
+ unlock_page(page);
+ break;
+ }
+
+ if (unlikely(is_range) && (page->index > end)) {
+ done = 1;
+ unlock_page(page);
+ break;
+ }
+
+ if (next && (page->index != next)) {
+ /* Not next consecutive page */
+ unlock_page(page);
+ break;
+ }
+
+ if (wbc->sync_mode != WB_SYNC_NONE)
+ wait_on_page_writeback(page);
+
+ if (PageWriteback(page) ||
+ !test_clear_page_dirty(page)) {
+ unlock_page(page);
+ break;
+ }
+
+ if (page_offset(page) >= mapping->host->i_size) {
+ done = 1;
+ unlock_page(page);
+ break;
+ }
+
+ /*
+ * BB can we get rid of this? pages are held by pvec
+ */
+ page_cache_get(page);
+
+ len = min(mapping->host->i_size - page_offset(page),
+ (loff_t)PAGE_CACHE_SIZE);
+
+ /* reserve iov[0] for the smb header */
+ n_iov++;
+ iov[n_iov].iov_base = kmap(page);
+ iov[n_iov].iov_len = len;
+ bytes_to_write += len;
+
+ if (first < 0) {
+ first = i;
+ offset = page_offset(page);
+ }
+ next = page->index + 1;
+ if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize)
+ break;
+ }
+ if (n_iov) {
+ /* Search for a writable handle every time we call
+ * CIFSSMBWrite2. We can't rely on the last handle
+ * we used to still be valid
+ */
+ open_file = find_writable_file(CIFS_I(mapping->host));
+ if (!open_file) {
+ cERROR(1, ("No writable handles for inode"));
+ rc = -EBADF;
+ } else {
+ rc = CIFSSMBWrite2(xid, cifs_sb->tcon,
+ open_file->netfid,
+ bytes_to_write, offset,
+ &bytes_written, iov, n_iov,
+ 1);
+ atomic_dec(&open_file->wrtPending);
+ if (rc || bytes_written < bytes_to_write) {
+ cERROR(1,("Write2 ret %d, written = %d",
+ rc, bytes_written));
+ /* BB what if continued retry is
+ requested via mount flags? */
+ set_bit(AS_EIO, &mapping->flags);
+ } else {
+ cifs_stats_bytes_written(cifs_sb->tcon,
+ bytes_written);
+ }
+ }
+ for (i = 0; i < n_iov; i++) {
+ page = pvec.pages[first + i];
+ /* Should we also set page error on
+ success rc but too little data written? */
+ /* BB investigate retry logic on temporary
+ server crash cases and how recovery works
+ when page marked as error */
+ if(rc)
+ SetPageError(page);
+ kunmap(page);
+ unlock_page(page);
+ page_cache_release(page);
+ }
+ if ((wbc->nr_to_write -= n_iov) <= 0)
+ done = 1;
+ index = next;
+ }
+ pagevec_release(&pvec);
+ }
+ if (!scanned && !done) {
+ /*
+ * We hit the last page and there is more work to be done: wrap
+ * back to the start of the file
+ */
+ scanned = 1;
+ index = 0;
+ goto retry;
+ }
+ if (!is_range)
+ mapping->writeback_index = index;
+
FreeXid(xid);
+
return rc;
}
-#endif
static int cifs_writepage(struct page* page, struct writeback_control *wbc)
{
return rc;
}
-/* static int cifs_sync_page(struct page *page)
+/* static void cifs_sync_page(struct page *page)
{
struct address_space *mapping;
struct inode *inode;
return 0;
inode = mapping->host;
if (!inode)
- return 0; */
+ return; */
/* fill in rpages then
result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */
/* cFYI(1, ("rpages is %d for sync page of Index %ld ", rpages, index));
+#if 0
if (rc < 0)
return rc;
return 0;
+#endif
} */
/*
rc = -EAGAIN;
smb_read_data = NULL;
while (rc == -EAGAIN) {
+ int buf_type = CIFS_NO_BUFFER;
if ((open_file->invalidHandle) &&
(!open_file->closePend)) {
rc = cifs_reopen_file(file->f_dentry->d_inode,
if (rc != 0)
break;
}
-
rc = CIFSSMBRead(xid, pTcon,
- open_file->netfid,
- current_read_size, *poffset,
- &bytes_read, &smb_read_data);
-
+ open_file->netfid,
+ current_read_size, *poffset,
+ &bytes_read, &smb_read_data,
+ &buf_type);
pSMBr = (struct smb_com_read_rsp *)smb_read_data;
- if (copy_to_user(current_offset,
- smb_read_data + 4 /* RFC1001 hdr */
- + le16_to_cpu(pSMBr->DataOffset),
- bytes_read)) {
- rc = -EFAULT;
- FreeXid(xid);
- return rc;
- }
if (smb_read_data) {
- cifs_buf_release(smb_read_data);
+ if (copy_to_user(current_offset,
+ smb_read_data +
+ 4 /* RFC1001 length field */ +
+ le16_to_cpu(pSMBr->DataOffset),
+ bytes_read)) {
+ rc = -EFAULT;
+ }
+
+ if(buf_type == CIFS_SMALL_BUFFER)
+ cifs_small_buf_release(smb_read_data);
+ else if(buf_type == CIFS_LARGE_BUFFER)
+ cifs_buf_release(smb_read_data);
smb_read_data = NULL;
}
}
return rc;
}
} else {
-#ifdef CONFIG_CIFS_STATS
- atomic_inc(&pTcon->num_reads);
- spin_lock(&pTcon->stat_lock);
- pTcon->bytes_read += total_read;
- spin_unlock(&pTcon->stat_lock);
-#endif
+ cifs_stats_bytes_read(pTcon, bytes_read);
*poffset += bytes_read;
}
}
int xid;
char *current_offset;
struct cifsFileInfo *open_file;
+ int buf_type = CIFS_NO_BUFFER;
xid = GetXid();
cifs_sb = CIFS_SB(file->f_dentry->d_sb);
total_read += bytes_read, current_offset += bytes_read) {
current_read_size = min_t(const int, read_size - total_read,
cifs_sb->rsize);
+ /* For windows me and 9x we do not want to request more
+ than it negotiated since it will refuse the read then */
+ if((pTcon->ses) &&
+ !(pTcon->ses->capabilities & CAP_LARGE_FILES)) {
+ current_read_size = min_t(const int, current_read_size,
+ pTcon->ses->server->maxBuf - 128);
+ }
rc = -EAGAIN;
while (rc == -EAGAIN) {
if ((open_file->invalidHandle) &&
if (rc != 0)
break;
}
-
rc = CIFSSMBRead(xid, pTcon,
- open_file->netfid,
- current_read_size, *poffset,
- &bytes_read, ¤t_offset);
+ open_file->netfid,
+ current_read_size, *poffset,
+ &bytes_read, ¤t_offset,
+ &buf_type);
}
if (rc || (bytes_read == 0)) {
if (total_read) {
return rc;
}
} else {
-#ifdef CONFIG_CIFS_STATS
- atomic_inc(&pTcon->num_reads);
- spin_lock(&pTcon->stat_lock);
- pTcon->bytes_read += total_read;
- spin_unlock(&pTcon->stat_lock);
-#endif
+ cifs_stats_bytes_read(pTcon, total_read);
*poffset += bytes_read;
}
}
struct smb_com_read_rsp *pSMBr;
struct pagevec lru_pvec;
struct cifsFileInfo *open_file;
+ int buf_type = CIFS_NO_BUFFER;
xid = GetXid();
if (file->private_data == NULL) {
}
rc = CIFSSMBRead(xid, pTcon,
- open_file->netfid,
- read_size, offset,
- &bytes_read, &smb_read_data);
- /* BB need to check return code here */
+ open_file->netfid,
+ read_size, offset,
+ &bytes_read, &smb_read_data,
+ &buf_type);
+ /* BB more RC checks ? */
if (rc== -EAGAIN) {
if (smb_read_data) {
- cifs_buf_release(smb_read_data);
+ if(buf_type == CIFS_SMALL_BUFFER)
+ cifs_small_buf_release(smb_read_data);
+ else if(buf_type == CIFS_LARGE_BUFFER)
+ cifs_buf_release(smb_read_data);
smb_read_data = NULL;
}
}
le16_to_cpu(pSMBr->DataOffset), &lru_pvec);
i += bytes_read >> PAGE_CACHE_SHIFT;
-#ifdef CONFIG_CIFS_STATS
- atomic_inc(&pTcon->num_reads);
- spin_lock(&pTcon->stat_lock);
- pTcon->bytes_read += bytes_read;
- spin_unlock(&pTcon->stat_lock);
-#endif
+ cifs_stats_bytes_read(pTcon, bytes_read);
if ((int)(bytes_read & PAGE_CACHE_MASK) != bytes_read) {
i++; /* account for partial page */
break;
}
if (smb_read_data) {
- cifs_buf_release(smb_read_data);
+ if(buf_type == CIFS_SMALL_BUFFER)
+ cifs_small_buf_release(smb_read_data);
+ else if(buf_type == CIFS_LARGE_BUFFER)
+ cifs_buf_release(smb_read_data);
smb_read_data = NULL;
}
bytes_read = 0;
/* need to free smb_read_data buf before exit */
if (smb_read_data) {
- cifs_buf_release(smb_read_data);
+ if(buf_type == CIFS_SMALL_BUFFER)
+ cifs_small_buf_release(smb_read_data);
+ else if(buf_type == CIFS_LARGE_BUFFER)
+ cifs_buf_release(smb_read_data);
smb_read_data = NULL;
}
page caching in the current Linux kernel design */
int is_size_safe_to_change(struct cifsInodeInfo *cifsInode)
{
- struct list_head *tmp;
- struct list_head *tmp1;
struct cifsFileInfo *open_file = NULL;
- int rc = TRUE;
- if (cifsInode == NULL)
- return rc;
-
- read_lock(&GlobalSMBSeslock);
- list_for_each_safe(tmp, tmp1, &cifsInode->openFileList) {
- open_file = list_entry(tmp, struct cifsFileInfo, flist);
- if (open_file == NULL)
- break;
- if (open_file->closePend)
- continue;
- /* We check if file is open for writing,
- BB we could supplement this with a check to see if file size
- changes have been flushed to server - ie inode metadata dirty */
- if ((open_file->pfile) &&
- ((open_file->pfile->f_flags & O_RDWR) ||
- (open_file->pfile->f_flags & O_WRONLY))) {
- rc = FALSE;
- break;
+ if (cifsInode)
+ open_file = find_writable_file(cifsInode);
+
+ if(open_file) {
+ struct cifs_sb_info *cifs_sb;
+
+ /* there is not actually a write pending so let
+ this handle go free and allow it to
+ be closable if needed */
+ atomic_dec(&open_file->wrtPending);
+
+ cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb);
+ 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;
}
- if (tmp->next == NULL) {
- cFYI(1, ("File instance %p removed", tmp));
- break;
- }
- }
- read_unlock(&GlobalSMBSeslock);
- return rc;
-}
+ return 0;
+ } else
+ return 1;
+}
static int cifs_prepare_write(struct file *file, struct page *page,
unsigned from, unsigned to)
.readpage = cifs_readpage,
.readpages = cifs_readpages,
.writepage = cifs_writepage,
+ .writepages = cifs_writepages,
.prepare_write = cifs_prepare_write,
.commit_write = cifs_commit_write,
.set_page_dirty = __set_page_dirty_nobuffers,
git://git.onelab.eu / linux-2.6.git / blobdiff