[PATCH] cifs: Fix caching problem
pointed out by Dave Stahl and Vince Negri in which cifs can update the last modify time on a server modified file without invalidating the local cached data due to an intervening readdir. Signed-off-by: Steve French (sfrench@us.ibm.com) Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Steve French
Linus Torvalds
Родитель
433dc24f24
Коммит
966ca92347
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@ -4,13 +4,16 @@ Steve French (sfrench@samba.org)
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The author wishes to express his appreciation and thanks to:
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Andrew Tridgell (Samba team) for his early suggestions about smb/cifs VFS
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improvements. Thanks to IBM for allowing me the time and test resources to pursue
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this project. Jim McDonough from IBM (and the Samba Team) for his help.
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The IBM Linux JFS team for explaining many esoteric Linux filesystem features.
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improvements. Thanks to IBM for allowing me time and test resources to pursue
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this project, to Jim McDonough from IBM (and the Samba Team) for his help, to
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the IBM Linux JFS team for explaining many esoteric Linux filesystem features.
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Jeremy Allison of the Samba team has done invaluable work in adding the server
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side of the original CIFS Unix extensions and reviewing and implementing
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portions of the newer CIFS POSIX extensions into the Samba 3 file server. Thank
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Dave Boutcher of IBM Rochester (author of the OS/400 smb/cifs filesystem client)
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for proving years ago that a very good smb/cifs client could be done on a Unix like
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operating system. Volker Lendecke, Andrew Tridgell, Urban Widmark, John Newbigin
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and others for their work on the Linux smbfs module over the years. Thanks to
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for proving years ago that very good smb/cifs clients could be done on Unix-like
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operating systems. Volker Lendecke, Andrew Tridgell, Urban Widmark, John
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Newbigin and others for their work on the Linux smbfs module. Thanks to
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the other members of the Storage Network Industry Association CIFS Technical
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Workgroup for their work specifying this highly complex protocol and finally
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thanks to the Samba team for their technical advice and encouragement.
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@ -24,9 +27,11 @@ Shobhit Dayal
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Sergey Vlasov
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Richard Hughes
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Yury Umanets
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Mark Hamzy
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Mark Hamzy (for some of the early cifs IPv6 work)
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Domen Puncer
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Jesper Juhl
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Jesper Juhl (in particular for lots of whitespace/formatting cleanup)
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Vince Negri and Dave Stahl (for finding an important caching bug)
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Adrian Bunk (kcalloc cleanups)
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Test case and Bug Report contributors
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-------------------------------------
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@ -36,7 +41,8 @@ Rene Scharfe, Martin Josefsson, Alexander Wild, Anthony Liguori,
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Lars Muller, Urban Widmark, Massimiliano Ferrero, Howard Owen,
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Olaf Kirch, Kieron Briggs, Nick Millington and others. Also special
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mention to the Stanford Checker (SWAT) which pointed out many minor
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bugs in error paths.
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bugs in error paths. Valuable suggestions also have come from Al Viro
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and Dave Miller.
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And thanks to the IBM LTC and Power test teams and SuSE testers for
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finding multiple bugs during excellent stress test runs.
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@ -1,3 +1,11 @@
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Version 1.33
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------------
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Fix caching problem, in which readdir of directory containing a file
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which was cached could cause the file's time stamp to be updated
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without invalidating the readahead data (so we could get stale
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file data on the client for that file even as the server copy changed).
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Version 1.32
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------------
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Fix oops in ls when Transact2 FindFirst (or FindNext) returns more than one
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@ -1,7 +1,7 @@
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/*
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* fs/cifs/cifsfs.h
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*
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* Copyright (c) International Business Machines Corp., 2002
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* Copyright (c) International Business Machines Corp., 2002, 2005
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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* This library is free software; you can redistribute it and/or modify
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@ -96,5 +96,5 @@ extern ssize_t cifs_getxattr(struct dentry *, const char *, void *, size_t);
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extern ssize_t cifs_listxattr(struct dentry *, char *, size_t);
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extern int cifs_ioctl (struct inode * inode, struct file * filep,
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unsigned int command, unsigned long arg);
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#define CIFS_VERSION "1.32"
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#define CIFS_VERSION "1.33"
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#endif /* _CIFSFS_H */
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@ -464,7 +464,7 @@ CIFSSMBTDis(const int xid, struct cifsTconInfo *tcon)
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rc = SendReceive(xid, tcon->ses, smb_buffer, smb_buffer_response,
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&length, 0);
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if (rc)
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cFYI(1, (" Tree disconnect failed %d", rc));
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cFYI(1, ("Tree disconnect failed %d", rc));
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if (smb_buffer)
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cifs_small_buf_release(smb_buffer);
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@ -3,7 +3,7 @@
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*
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* Directory search handling
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*
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* Copyright (C) International Business Machines Corp., 2004
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* Copyright (C) International Business Machines Corp., 2004, 2005
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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* This library is free software; you can redistribute it and/or modify
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@ -65,14 +65,14 @@ static int construct_dentry(struct qstr *qstring, struct file *file,
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struct cifsTconInfo *pTcon;
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int rc = 0;
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cFYI(1, ("For %s ", qstring->name));
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cFYI(1, ("For %s", qstring->name));
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cifs_sb = CIFS_SB(file->f_dentry->d_sb);
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pTcon = cifs_sb->tcon;
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qstring->hash = full_name_hash(qstring->name, qstring->len);
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tmp_dentry = d_lookup(file->f_dentry, qstring);
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if (tmp_dentry) {
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cFYI(0, (" existing dentry with inode 0x%p", tmp_dentry->d_inode));
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cFYI(0, ("existing dentry with inode 0x%p", tmp_dentry->d_inode));
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*ptmp_inode = tmp_dentry->d_inode;
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/* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
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if(*ptmp_inode == NULL) {
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@ -105,8 +105,11 @@ static int construct_dentry(struct qstr *qstring, struct file *file,
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}
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static void fill_in_inode(struct inode *tmp_inode,
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FILE_DIRECTORY_INFO *pfindData, int *pobject_type)
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FILE_DIRECTORY_INFO *pfindData, int *pobject_type, int isNewInode)
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{
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loff_t local_size;
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struct timespec local_mtime;
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struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
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struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
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__u32 attr = le32_to_cpu(pfindData->ExtFileAttributes);
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@ -116,6 +119,10 @@ static void fill_in_inode(struct inode *tmp_inode,
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cifsInfo->cifsAttrs = attr;
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cifsInfo->time = jiffies;
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/* save mtime and size */
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local_mtime = tmp_inode->i_mtime;
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local_size = tmp_inode->i_size;
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/* Linux can not store file creation time unfortunately so ignore it */
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tmp_inode->i_atime =
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cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
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@ -134,7 +141,6 @@ static void fill_in_inode(struct inode *tmp_inode,
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tmp_inode->i_mode = cifs_sb->mnt_file_mode;
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}
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cFYI(0,("CIFS FFIRST: Attributes came in as 0x%x",attr));
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if (attr & ATTR_DIRECTORY) {
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*pobject_type = DT_DIR;
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/* override default perms since we do not lock dirs */
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@ -175,30 +181,46 @@ static void fill_in_inode(struct inode *tmp_inode,
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(unsigned long)tmp_inode->i_size, tmp_inode->i_blocks,
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tmp_inode->i_blksize));
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if (S_ISREG(tmp_inode->i_mode)) {
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cFYI(1, (" File inode "));
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cFYI(1, ("File inode"));
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tmp_inode->i_op = &cifs_file_inode_ops;
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if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
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tmp_inode->i_fop = &cifs_file_direct_ops;
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else
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tmp_inode->i_fop = &cifs_file_ops;
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tmp_inode->i_data.a_ops = &cifs_addr_ops;
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if(isNewInode)
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return; /* No sense invalidating pages for new inode since we
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have not started caching readahead file data yet */
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if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
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(local_size == tmp_inode->i_size)) {
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cFYI(1, ("inode exists but unchanged"));
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} else {
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/* file may have changed on server */
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cFYI(1, ("invalidate inode, readdir detected change"));
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invalidate_remote_inode(tmp_inode);
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}
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} else if (S_ISDIR(tmp_inode->i_mode)) {
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cFYI(1, (" Directory inode"));
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cFYI(1, ("Directory inode"));
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tmp_inode->i_op = &cifs_dir_inode_ops;
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tmp_inode->i_fop = &cifs_dir_ops;
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} else if (S_ISLNK(tmp_inode->i_mode)) {
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cFYI(1, (" Symbolic Link inode "));
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cFYI(1, ("Symbolic Link inode"));
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tmp_inode->i_op = &cifs_symlink_inode_ops;
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} else {
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cFYI(1, (" Init special inode "));
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cFYI(1, ("Init special inode"));
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init_special_inode(tmp_inode, tmp_inode->i_mode,
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tmp_inode->i_rdev);
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}
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}
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static void unix_fill_in_inode(struct inode *tmp_inode,
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FILE_UNIX_INFO *pfindData, int *pobject_type)
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FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
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{
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loff_t local_size;
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struct timespec local_mtime;
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struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
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struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
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@ -208,6 +230,10 @@ static void unix_fill_in_inode(struct inode *tmp_inode,
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cifsInfo->time = jiffies;
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atomic_inc(&cifsInfo->inUse);
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/* save mtime and size */
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local_mtime = tmp_inode->i_mtime;
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local_size = tmp_inode->i_size;
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tmp_inode->i_atime =
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cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
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tmp_inode->i_mtime =
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@ -265,6 +291,19 @@ static void unix_fill_in_inode(struct inode *tmp_inode,
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else
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tmp_inode->i_fop = &cifs_file_ops;
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tmp_inode->i_data.a_ops = &cifs_addr_ops;
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if(isNewInode)
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return; /* No sense invalidating pages for new inode since we
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have not started caching readahead file data yet */
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if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
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(local_size == tmp_inode->i_size)) {
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cFYI(1, ("inode exists but unchanged"));
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} else {
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/* file may have changed on server */
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cFYI(1, ("invalidate inode, readdir detected change"));
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invalidate_remote_inode(tmp_inode);
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}
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} else if (S_ISDIR(tmp_inode->i_mode)) {
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cFYI(1, ("Directory inode"));
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tmp_inode->i_op = &cifs_dir_inode_ops;
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@ -321,7 +360,7 @@ static int initiate_cifs_search(const int xid, struct file *file)
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return -ENOMEM;
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}
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cFYI(1, ("Full path: %s start at: %lld ", full_path, file->f_pos));
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cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
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ffirst_retry:
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/* test for Unix extensions */
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@ -666,10 +705,15 @@ static int cifs_filldir(char *pfindEntry, struct file *file,
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insert_inode_hash(tmp_inode);
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}
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/* we pass in rc below, indicating whether it is a new inode,
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so we can figure out whether to invalidate the inode cached
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data if the file has changed */
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if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
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unix_fill_in_inode(tmp_inode,(FILE_UNIX_INFO *)pfindEntry,&obj_type);
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unix_fill_in_inode(tmp_inode,
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(FILE_UNIX_INFO *)pfindEntry,&obj_type, rc);
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} else {
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fill_in_inode(tmp_inode,(FILE_DIRECTORY_INFO *)pfindEntry,&obj_type);
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fill_in_inode(tmp_inode,
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(FILE_DIRECTORY_INFO *)pfindEntry,&obj_type, rc);
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}
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rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,tmp_inode->i_ino,obj_type);
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