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linux-sg2042
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[CIFS] lock inode open file list in close in case racing with open 

Harmless since it only protected turning off caching for the
inode, but cleaner to lock around this in case we have a close
racing with open.

Signed-off-by: Shaggy <shaggy@us.ibm.com>
CC: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French 2007-09-11 05:50:53 +00:00
parent 15745320f3
commit 4efa53f090
1 changed files with 2 additions and 0 deletions
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2
fs/cifs/file.c
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@ -545,6 +545,7 @@ int cifs_close(struct inode *inode, struct file *file)
} else } else
rc = -EBADF; rc = -EBADF;
read_lock(&GlobalSMBSeslock);
if (list_empty(&(CIFS_I(inode)->openFileList))) { if (list_empty(&(CIFS_I(inode)->openFileList))) {
cFYI(1, ("closing last open instance for inode %p", inode)); 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 /* if the file is not open we do not know if we can cache info
@ -552,6 +553,7 @@ int cifs_close(struct inode *inode, struct file *file)
CIFS_I(inode)->clientCanCacheRead = FALSE; CIFS_I(inode)->clientCanCacheRead = FALSE;
CIFS_I(inode)->clientCanCacheAll = FALSE; CIFS_I(inode)->clientCanCacheAll = FALSE;
} }
read_unlock(&GlobalSMBSeslock);
if ((rc == 0) && CIFS_I(inode)->write_behind_rc) if ((rc == 0) && CIFS_I(inode)->write_behind_rc)
rc = CIFS_I(inode)->write_behind_rc; rc = CIFS_I(inode)->write_behind_rc;
FreeXid(xid); FreeXid(xid);