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[CIFS] Add in some missing flags and cifs README and TODO corrections
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Steve French
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@ -8,7 +8,10 @@ when Unix Extensions were ignored). This allows users to override the
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default uid and gid for files when they are certain that the uids or
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gids on the server do not match those of the client. Make "sec=none"
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mount override username (so that null user connection is attempted)
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to match what documentation said.
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to match what documentation said. Support for very large reads, over 127K,
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available to some newer servers (such as Samba 3.0.26 and later but
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note that it also requires setting CIFSMaxBufSize at module install
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time to a larger value which may hurt performance in some cases).
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Version 1.48
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------------
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@ -301,10 +301,21 @@ A partial list of the supported mount options follows:
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during the local client kernel build will be used.
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If server does not support Unicode, this parameter is
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unused.
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rsize default read size (usually 16K)
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wsize default write size (usually 16K, 32K is often better over GigE)
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maximum wsize currently allowed by CIFS is 57344 (14 4096 byte
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pages)
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rsize default read size (usually 16K). The client currently
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can not use rsize larger than CIFSMaxBufSize. CIFSMaxBufSize
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defaults to 16K and may be changed (from 8K to the maximum
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kmalloc size allowed by your kernel) at module install time
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for cifs.ko. Setting CIFSMaxBufSize to a very large value
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will cause cifs to use more memory and may reduce performance
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in some cases. To use rsize greater than 127K (the original
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cifs protocol maximum) also requires that the server support
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a new Unix Capability flag (for very large read) which some
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newer servers (e.g. Samba 3.0.26 or later) do. rsize can be
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set from a minimum of 2048 to a maximum of 130048 (127K or
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CIFSMaxBufSize, whichever is smaller)
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wsize default write size (default 57344)
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maximum wsize currently allowed by CIFS is 57344 (fourteen
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4096 byte pages)
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rw mount the network share read-write (note that the
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server may still consider the share read-only)
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ro mount network share read-only
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@ -582,10 +593,10 @@ the start of smb requests and responses can be enabled via:
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echo 1 > /proc/fs/cifs/traceSMB
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Two other experimental features are under development and to test
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require enabling CONFIG_CIFS_EXPERIMENTAL
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Two other experimental features are under development. To test these
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requires enabling CONFIG_CIFS_EXPERIMENTAL
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More efficient write operations
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ipv6 enablement
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DNOTIFY fcntl: needed for support of directory change
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notification and perhaps later for file leases)
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@ -106,6 +106,12 @@ but recognizes them
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succeed but still return access denied (appears to be Windows
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server not cifs client problem) and has not been reproduced recently.
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NTFS partitions do not have this problem.
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4) Unix/POSIX capabilities are reset after reconnection, and affect
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a few fields in the tree connection but we do do not know which
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superblocks to apply these changes to. We should probably walk
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the list of superblocks to set these. Also need to check the
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flags on the second mount to the same share, and see if we
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can do the same trick that NFS does to remount duplicate shares.
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Misc testing to do
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==================
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@ -712,6 +712,7 @@ typedef struct smb_com_findclose_req {
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#define REQ_OPLOCK 0x00000002
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#define REQ_BATCHOPLOCK 0x00000004
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#define REQ_OPENDIRONLY 0x00000008
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#define REQ_EXTENDED_INFO 0x00000010
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typedef struct smb_com_open_req { /* also handles create */
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struct smb_hdr hdr; /* wct = 24 */
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@ -1886,14 +1887,18 @@ typedef struct {
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#define CIFS_UNIX_POSIX_PATH_OPS_CAP 0x00000020 /* Allow new POSIX path based
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calls including posix open
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and posix unlink */
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#define CIFS_UNIX_LARGE_READ_CAP 0x00000040 /* support reads >128K (up
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to 0xFFFF00 */
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#define CIFS_UNIX_LARGE_WRITE_CAP 0x00000080
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#ifdef CONFIG_CIFS_POSIX
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/* Can not set pathnames cap yet until we send new posix create SMB since
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otherwise server can treat such handles opened with older ntcreatex
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(by a new client which knows how to send posix path ops)
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as non-posix handles (can affect write behavior with byte range locks.
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We can add back in POSIX_PATH_OPS cap when Posix Create/Mkdir finished */
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/* #define CIFS_UNIX_CAP_MASK 0x0000003b */
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#define CIFS_UNIX_CAP_MASK 0x0000001b
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/* #define CIFS_UNIX_CAP_MASK 0x000000fb */
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#define CIFS_UNIX_CAP_MASK 0x000000db
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#else
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#define CIFS_UNIX_CAP_MASK 0x00000013
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#endif /* CONFIG_CIFS_POSIX */
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@ -1,7 +1,7 @@
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/*
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* fs/cifs/connect.c
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*
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* Copyright (C) International Business Machines Corp., 2002,2006
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* Copyright (C) International Business Machines Corp., 2002,2007
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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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@ -1673,6 +1673,16 @@ void reset_cifs_unix_caps(int xid, struct cifsTconInfo * tcon,
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if (sb && (CIFS_SB(sb)->prepathlen > 0))
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CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
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if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
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if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
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CIFS_SB(sb)->rsize = 127 * 1024;
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#ifdef CONFIG_CIFS_DEBUG2
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cFYI(1,("larger reads not supported by srv"));
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#endif
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}
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}
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cFYI(1,("Negotiate caps 0x%x",(int)cap));
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#ifdef CONFIG_CIFS_DEBUG2
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if (cap & CIFS_UNIX_FCNTL_CAP)
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@ -1685,6 +1695,10 @@ void reset_cifs_unix_caps(int xid, struct cifsTconInfo * tcon,
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cFYI(1,("XATTR cap"));
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if (cap & CIFS_UNIX_POSIX_ACL_CAP)
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cFYI(1,("POSIX ACL cap"));
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if (cap & CIFS_UNIX_LARGE_READ_CAP)
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cFYI(1,("very large read cap"));
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if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
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cFYI(1,("very large write cap"));
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#endif /* CIFS_DEBUG2 */
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if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
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cFYI(1,("setting capabilities failed"));
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@ -1935,13 +1949,14 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
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cERROR(1,("rsize %d too large, using MaxBufSize",
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volume_info.rsize));
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cifs_sb->rsize = CIFSMaxBufSize;
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} else if((volume_info.rsize) && (volume_info.rsize <= CIFSMaxBufSize))
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} else if ((volume_info.rsize) &&
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(volume_info.rsize <= CIFSMaxBufSize))
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cifs_sb->rsize = volume_info.rsize;
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else /* default */
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cifs_sb->rsize = CIFSMaxBufSize;
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if (volume_info.wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
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cERROR(1,("wsize %d too large using 4096 instead",
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cERROR(1,("wsize %d too large, using 4096 instead",
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volume_info.wsize));
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cifs_sb->wsize = 4096;
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} else if (volume_info.wsize)
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@ -1960,7 +1975,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
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if (cifs_sb->rsize < 2048) {
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cifs_sb->rsize = 2048;
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/* Windows ME may prefer this */
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cFYI(1,("readsize set to minimum 2048"));
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cFYI(1,("readsize set to minimum: 2048"));
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}
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/* calculate prepath */
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cifs_sb->prepath = volume_info.prepath;
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@ -2116,7 +2131,13 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
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/* tell server which Unix caps we support */
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if (tcon->ses->capabilities & CAP_UNIX)
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reset_cifs_unix_caps(xid, tcon, sb, &volume_info);
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else if(cifs_sb->rsize > (1024 * 127)) {
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cifs_sb->rsize = 1024 * 127;
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#ifdef CONFIG_CIFS_DEBUG2
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cFYI(1,("no very large read support, rsize 127K"));
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#endif
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}
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if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
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cifs_sb->wsize = min(cifs_sb->wsize,
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(tcon->ses->server->maxBuf -
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@ -1720,7 +1720,9 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
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pTcon = cifs_sb->tcon;
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pagevec_init(&lru_pvec, 0);
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#ifdef CONFIG_CIFS_DEBUG2
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cFYI(1,("rpages: num pages %d", num_pages));
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#endif
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for (i = 0; i < num_pages; ) {
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unsigned contig_pages;
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struct page *tmp_page;
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@ -1753,7 +1755,10 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
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/* Read size needs to be in multiples of one page */
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read_size = min_t(const unsigned int, read_size,
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cifs_sb->rsize & PAGE_CACHE_MASK);
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#ifdef CONFIG_CIFS_DEBUG2
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cFYI(1,("rpages: read size 0x%x contiguous pages %d",
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read_size, contig_pages));
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#endif
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rc = -EAGAIN;
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while (rc == -EAGAIN) {
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if ((open_file->invalidHandle) &&
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