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[CIFS] Allow update of EOF on remote extend of file

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Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French 2007-02-08 18:14:13 +00:00
parent 595dcfecf6
commit 7ba526316a
4 changed files with 11 additions and 8 deletions
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2
fs/cifs/cifsproto.h
View File

@ -57,7 +57,7 @@ extern int SendReceiveBlockingLock(const unsigned int /* xid */ ,
int * /* bytes returned */);
extern int checkSMB(struct smb_hdr *smb, __u16 mid, unsigned int length);
extern int is_valid_oplock_break(struct smb_hdr *smb, struct TCP_Server_Info *);
extern int is_size_safe_to_change(struct cifsInodeInfo *);
extern int is_size_safe_to_change(struct cifsInodeInfo *, __u64 eof);
extern struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *);
extern unsigned int smbCalcSize(struct smb_hdr *ptr);
extern unsigned int smbCalcSize_LE(struct smb_hdr *ptr);

5
fs/cifs/file.c
View File

@ -1954,7 +1954,7 @@ static int cifs_readpage(struct file *file, struct page *page)
refreshing the inode only on increases in the file size
but this is tricky to do without racing with writebehind
page caching in the current Linux kernel design */
int is_size_safe_to_change(struct cifsInodeInfo *cifsInode)
int is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file)
{
struct cifsFileInfo *open_file = NULL;
@ -1976,6 +1976,9 @@ int is_size_safe_to_change(struct cifsInodeInfo *cifsInode)
return 1;
}
if(i_size_read(&cifsInode->vfs_inode) < end_of_file)
return 1;
return 0;
} else
return 1;

6
fs/cifs/inode.c
View File

@ -140,7 +140,7 @@ int cifs_get_inode_info_unix(struct inode **pinode,
inode->i_gid = le64_to_cpu(findData.Gid);
inode->i_nlink = le64_to_cpu(findData.Nlinks);
if (is_size_safe_to_change(cifsInfo)) {
if (is_size_safe_to_change(cifsInfo, end_of_file)) {
/* can not safely change the file size here if the
client is writing to it due to potential races */
@ -491,8 +491,8 @@ int cifs_get_inode_info(struct inode **pinode,
/* BB add code here -
validate if device or weird share or device type? */
}
if (is_size_safe_to_change(cifsInfo)) {
/* can not safely change the file size here if the
if (is_size_safe_to_change(cifsInfo, le64_to_cpu(pfindData->EndOfFile))) {
/* can not safely shrink the file size here if the
client is writing to it due to potential races */
i_size_write(inode,le64_to_cpu(pfindData->EndOfFile));

6
fs/cifs/readdir.c
View File

@ -222,7 +222,7 @@ static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
atomic_set(&cifsInfo->inUse, 1);
}
if (is_size_safe_to_change(cifsInfo)) {
if (is_size_safe_to_change(cifsInfo, end_of_file)) {
/* can not safely change the file size here if the
client is writing to it due to potential races */
i_size_write(tmp_inode, end_of_file);
@ -351,10 +351,10 @@ static void unix_fill_in_inode(struct inode *tmp_inode,
tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
if (is_size_safe_to_change(cifsInfo)) {
if (is_size_safe_to_change(cifsInfo, end_of_file)) {
/* can not safely change the file size here if the
client is writing to it due to potential races */
i_size_write(tmp_inode,end_of_file);
i_size_write(tmp_inode, end_of_file);
/* 512 bytes (2**9) is the fake blocksize that must be used */
/* for this calculation, not the real blocksize */