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-rw-r--r--fs/cifs/CHANGES6
-rw-r--r--fs/cifs/cifsfs.h2
-rw-r--r--fs/cifs/cifsglob.h1
-rw-r--r--fs/cifs/file.c88
-rw-r--r--fs/cifs/inode.c1
5 files changed, 73 insertions, 25 deletions
diff --git a/fs/cifs/CHANGES b/fs/cifs/CHANGES
index f554a70..5bab24f 100644
--- a/fs/cifs/CHANGES
+++ b/fs/cifs/CHANGES
@@ -1,3 +1,9 @@
+Version 1.39
+------------
+Defer close of a file handle slightly if pending writes depend on that file handle
+(this reduces the EBADF bad file handle errors that can be logged under heavy
+stress on writes).
+
Version 1.38
------------
Fix tcp socket retransmission timeouts (e.g. on ENOSPACE from the socket)
diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h
index 4cdb29f..1223fa8 100644
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -97,5 +97,5 @@ extern ssize_t cifs_getxattr(struct dentry *, const char *, void *, size_t);
extern ssize_t cifs_listxattr(struct dentry *, char *, size_t);
extern int cifs_ioctl (struct inode * inode, struct file * filep,
unsigned int command, unsigned long arg);
-#define CIFS_VERSION "1.38"
+#define CIFS_VERSION "1.39"
#endif /* _CIFSFS_H */
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 839a556..1ba08f8 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -299,6 +299,7 @@ struct cifsFileInfo {
struct inode * pInode; /* needed for oplock break */
unsigned closePend:1; /* file is marked to close */
unsigned invalidHandle:1; /* file closed via session abend */
+ atomic_t wrtPending; /* handle in use - defer close */
struct semaphore fh_sem; /* prevents reopen race after dead ses*/
char * search_resume_name; /* BB removeme BB */
unsigned int resume_name_length; /* BB removeme - field renamed and moved BB */
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 23af20d..da4f5e1 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -29,6 +29,7 @@
#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"
@@ -50,6 +51,11 @@ static inline struct cifsFileInfo *cifs_init_private(
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;
}
@@ -473,6 +479,20 @@ int cifs_close(struct inode *inode, struct file *file)
/* 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 */
+ cERROR(1,("close with pending writes"));
+ msleep(timeout);
+ timeout *= 4;
+ }
write_unlock(&file->f_owner.lock);
rc = CIFSSMBClose(xid, pTcon,
pSMBFile->netfid);
@@ -919,9 +939,10 @@ struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode)
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)) {
+ (!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 */
@@ -929,6 +950,10 @@ struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode)
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;
}
}
@@ -981,6 +1006,7 @@ static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
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)) {
@@ -1016,7 +1042,7 @@ static int cifs_writepages(struct address_space *mapping,
pgoff_t next;
int nr_pages;
__u64 offset = 0;
- struct cifsFileInfo *open_file = NULL;
+ struct cifsFileInfo *open_file;
struct page *page;
struct pagevec pvec;
int rc = 0;
@@ -1071,15 +1097,6 @@ retry:
int first;
unsigned int i;
- if (!open_file) {
- open_file = find_writable_file(CIFS_I(mapping->host));
- if (!open_file) {
- pagevec_release(&pvec);
- cERROR(1, ("No writable handles for inode"));
- return -EIO;
- }
- }
-
first = -1;
next = 0;
n_iov = 0;
@@ -1155,18 +1172,32 @@ retry:
break;
}
if (n_iov) {
- rc = CIFSSMBWrite2(xid, cifs_sb->tcon,
- open_file->netfid, bytes_to_write,
- offset, &bytes_written, iov, n_iov,
- 1);
- if (rc || bytes_written < bytes_to_write) {
- cERROR(1,("CIFSSMBWrite2 returned %d, written = %x",
- rc, bytes_written));
- set_bit(AS_EIO, &mapping->flags);
- SetPageError(page);
+ /* 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 {
- cifs_stats_bytes_written(cifs_sb->tcon,
- bytes_written);
+ 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);
+ SetPageError(page);
+ } else {
+ cifs_stats_bytes_written(cifs_sb->tcon,
+ bytes_written);
+ }
}
for (i = 0; i < n_iov; i++) {
page = pvec.pages[first + i];
@@ -1788,9 +1819,18 @@ static int cifs_readpage(struct file *file, struct page *page)
page caching in the current Linux kernel design */
int is_size_safe_to_change(struct cifsInodeInfo *cifsInode)
{
- if (cifsInode && find_writable_file(cifsInode))
+ struct cifsFileInfo *open_file = NULL;
+
+ if (cifsInode)
+ open_file = find_writable_file(cifsInode);
+
+ if(open_file) {
+ /* 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);
return 0;
- else
+ } else
return 1;
}
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index ff4d1cc7..912d401 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1006,6 +1006,7 @@ int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
__u32 npid = open_file->pid;
rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
nfid, npid, FALSE);
+ atomic_dec(&open_file->wrtPending);
cFYI(1,("SetFSize for attrs rc = %d", rc));
if(rc == -EINVAL) {
int bytes_written;
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