From f87d39d951329cd8f462bf9007d334122c0599d0 Mon Sep 17 00:00:00 2001 From: Steve French Date: Fri, 27 May 2011 03:50:55 +0000 Subject: [CIFS] Migrate from prefixpath logic Now we point superblock to a server share root and set a root dentry appropriately. This let us share superblock between mounts like //server/sharename/foo/bar and //server/sharename/foo further. Reviewed-by: Jeff Layton Signed-off-by: Pavel Shilovsky Signed-off-by: Steve French --- fs/cifs/cifs_fs_sb.h | 2 -- 1 file changed, 2 deletions(-) (limited to 'fs/cifs/cifs_fs_sb.h') diff --git a/fs/cifs/cifs_fs_sb.h b/fs/cifs/cifs_fs_sb.h index a9d5692e0c2..c96b44b4e26 100644 --- a/fs/cifs/cifs_fs_sb.h +++ b/fs/cifs/cifs_fs_sb.h @@ -56,8 +56,6 @@ struct cifs_sb_info { mode_t mnt_file_mode; mode_t mnt_dir_mode; unsigned int mnt_cifs_flags; - int prepathlen; - char *prepath; /* relative path under the share to mount to */ char *mountdata; /* options received at mount time or via DFS refs */ struct backing_dev_info bdi; struct delayed_work prune_tlinks; -- cgit v1.2.3-70-g09d2 From d4ffff1fa9695c5b5c0bf337e208d8833b88ff2d Mon Sep 17 00:00:00 2001 From: Pavel Shilovsky Date: Thu, 26 May 2011 06:02:00 +0000 Subject: CIFS: Add rwpidforward mount option Add rwpidforward mount option that switches on a mode when we forward pid of a process who opened a file to any read and write operation. This can prevent applications like WINE from failing on read or write operation on a previously locked file region from the same netfd from another process if we use mandatory brlock style. It is actual for WINE because during a run of WINE program two processes work on the same netfd - share the same file struct between several VFS fds: 1) WINE-server does open and lock; 2) WINE-application does read and write. Signed-off-by: Pavel Shilovsky Signed-off-by: Steve French --- fs/cifs/README | 3 ++ fs/cifs/cifs_fs_sb.h | 1 + fs/cifs/cifsfs.c | 8 +++++ fs/cifs/cifsglob.h | 1 + fs/cifs/cifsproto.h | 5 ++-- fs/cifs/cifssmb.c | 17 +++++++---- fs/cifs/connect.c | 4 +++ fs/cifs/file.c | 82 +++++++++++++++++++++++++++++++++++++++------------- fs/cifs/inode.c | 11 +++++-- fs/cifs/link.c | 22 +++++++++----- 10 files changed, 115 insertions(+), 39 deletions(-) (limited to 'fs/cifs/cifs_fs_sb.h') diff --git a/fs/cifs/README b/fs/cifs/README index 4a3ca0e5ca2..c5c2c5e5f0f 100644 --- a/fs/cifs/README +++ b/fs/cifs/README @@ -457,6 +457,9 @@ A partial list of the supported mount options follows: otherwise - read from the server. All written data are stored in the cache, but if the client doesn't have Exclusive Oplock, it writes the data to the server. + rwpidforward Forward pid of a process who opened a file to any read or write + operation on that file. This prevent applications like WINE + from failing on read and write if we use mandatory brlock style. acl Allow setfacl and getfacl to manage posix ACLs if server supports them. (default) noacl Do not allow setfacl and getfacl calls on this mount diff --git a/fs/cifs/cifs_fs_sb.h b/fs/cifs/cifs_fs_sb.h index c96b44b4e26..ffb1459dc6e 100644 --- a/fs/cifs/cifs_fs_sb.h +++ b/fs/cifs/cifs_fs_sb.h @@ -41,6 +41,7 @@ #define CIFS_MOUNT_MF_SYMLINKS 0x10000 /* Minshall+French Symlinks enabled */ #define CIFS_MOUNT_MULTIUSER 0x20000 /* multiuser mount */ #define CIFS_MOUNT_STRICT_IO 0x40000 /* strict cache mode */ +#define CIFS_MOUNT_RWPIDFORWARD 0x80000 /* use pid forwarding for rw */ struct cifs_sb_info { struct rb_root tlink_tree; diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index 360fe2ec2a1..26981bf2cf3 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -415,12 +415,20 @@ cifs_show_options(struct seq_file *s, struct vfsmount *m) seq_printf(s, ",nocase"); if (tcon->retry) seq_printf(s, ",hard"); + if (tcon->unix_ext) + seq_printf(s, ",unix"); + else + seq_printf(s, ",nounix"); if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) seq_printf(s, ",posixpaths"); if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) seq_printf(s, ",setuids"); if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) seq_printf(s, ",serverino"); + if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) + seq_printf(s, ",rwpidforward"); + if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) + seq_printf(s, ",forcemand"); if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) seq_printf(s, ",directio"); if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index ca0c3789206..310cddabd3f 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -200,6 +200,7 @@ struct smb_vol { bool fsc:1; /* enable fscache */ bool mfsymlinks:1; /* use Minshall+French Symlinks */ bool multiuser:1; + bool rwpidforward:1; /* pid forward for read/write operations */ unsigned int rsize; unsigned int wsize; bool sockopt_tcp_nodelay:1; diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h index e41f6071cdd..17063455918 100644 --- a/fs/cifs/cifsproto.h +++ b/fs/cifs/cifsproto.h @@ -345,9 +345,8 @@ extern int CIFSSMBClose(const int xid, struct cifsTconInfo *tcon, extern int CIFSSMBFlush(const int xid, struct cifsTconInfo *tcon, const int smb_file_id); -extern int CIFSSMBRead(const int xid, struct cifsTconInfo *tcon, - const int netfid, unsigned int count, - const __u64 lseek, unsigned int *nbytes, char **buf, +extern int CIFSSMBRead(const int xid, struct cifs_io_parms *io_parms, + unsigned int *nbytes, char **buf, int *return_buf_type); extern int CIFSSMBWrite(const int xid, struct cifs_io_parms *io_parms, unsigned int *nbytes, const char *buf, diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c index f39fa08b9b0..19fd8158bb4 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -1382,8 +1382,7 @@ openRetry: } int -CIFSSMBRead(const int xid, struct cifsTconInfo *tcon, const int netfid, - const unsigned int count, const __u64 lseek, unsigned int *nbytes, +CIFSSMBRead(const int xid, struct cifs_io_parms *io_parms, unsigned int *nbytes, char **buf, int *pbuf_type) { int rc = -EACCES; @@ -1393,13 +1392,18 @@ CIFSSMBRead(const int xid, struct cifsTconInfo *tcon, const int netfid, int wct; int resp_buf_type = 0; struct kvec iov[1]; + __u32 pid = io_parms->pid; + __u16 netfid = io_parms->netfid; + __u64 offset = io_parms->offset; + struct cifsTconInfo *tcon = io_parms->tcon; + unsigned int count = io_parms->length; cFYI(1, "Reading %d bytes on fid %d", count, netfid); if (tcon->ses->capabilities & CAP_LARGE_FILES) wct = 12; else { wct = 10; /* old style read */ - if ((lseek >> 32) > 0) { + if ((offset >> 32) > 0) { /* can not handle this big offset for old */ return -EIO; } @@ -1410,15 +1414,18 @@ CIFSSMBRead(const int xid, struct cifsTconInfo *tcon, const int netfid, if (rc) return rc; + pSMB->hdr.Pid = cpu_to_le16((__u16)pid); + pSMB->hdr.PidHigh = cpu_to_le16((__u16)(pid >> 16)); + /* tcon and ses pointer are checked in smb_init */ if (tcon->ses->server == NULL) return -ECONNABORTED; pSMB->AndXCommand = 0xFF; /* none */ pSMB->Fid = netfid; - pSMB->OffsetLow = cpu_to_le32(lseek & 0xFFFFFFFF); + pSMB->OffsetLow = cpu_to_le32(offset & 0xFFFFFFFF); if (wct == 12) - pSMB->OffsetHigh = cpu_to_le32(lseek >> 32); + pSMB->OffsetHigh = cpu_to_le32(offset >> 32); pSMB->Remaining = 0; pSMB->MaxCount = cpu_to_le16(count & 0xFFFF); diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 261ca81d5e4..21bc83586be 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -1359,6 +1359,8 @@ cifs_parse_mount_options(const char *mountdata, const char *devname, vol->server_ino = 1; } else if (strnicmp(data, "noserverino", 9) == 0) { vol->server_ino = 0; + } else if (strnicmp(data, "rwpidforward", 4) == 0) { + vol->rwpidforward = 1; } else if (strnicmp(data, "cifsacl", 7) == 0) { vol->cifs_acl = 1; } else if (strnicmp(data, "nocifsacl", 9) == 0) { @@ -2708,6 +2710,8 @@ void cifs_setup_cifs_sb(struct smb_vol *pvolume_info, cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC; if (pvolume_info->mand_lock) cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL; + if (pvolume_info->rwpidforward) + cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD; if (pvolume_info->cifs_acl) cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL; if (pvolume_info->override_uid) diff --git a/fs/cifs/file.c b/fs/cifs/file.c index dfc0d35b147..7db74d17a42 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -725,8 +725,8 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) else posix_lock_type = CIFS_WRLCK; rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, - length, pfLock, - posix_lock_type, wait_flag); + length, pfLock, posix_lock_type, + wait_flag); FreeXid(xid); return rc; } @@ -797,8 +797,8 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) posix_lock_type = CIFS_UNLCK; rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, - length, pfLock, - posix_lock_type, wait_flag); + length, pfLock, posix_lock_type, + wait_flag); } else { struct cifsFileInfo *fid = file->private_data; @@ -1346,6 +1346,14 @@ static int cifs_write_end(struct file *file, struct address_space *mapping, { int rc; struct inode *inode = mapping->host; + struct cifsFileInfo *cfile = file->private_data; + struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); + __u32 pid; + + if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) + pid = cfile->pid; + else + pid = current->tgid; cFYI(1, "write_end for page %p from pos %lld with %d bytes", page, pos, copied); @@ -1369,8 +1377,7 @@ static int cifs_write_end(struct file *file, struct address_space *mapping, /* BB check if anything else missing out of ppw such as updating last write time */ page_data = kmap(page); - rc = cifs_write(file->private_data, current->tgid, - page_data + offset, copied, &pos); + rc = cifs_write(cfile, pid, page_data + offset, copied, &pos); /* if (rc < 0) should we set writebehind rc? */ kunmap(page); @@ -1523,6 +1530,7 @@ cifs_iovec_write(struct file *file, const struct iovec *iov, struct cifs_sb_info *cifs_sb; struct cifs_io_parms io_parms; int xid, rc; + __u32 pid; len = iov_length(iov, nr_segs); if (!len) @@ -1554,6 +1562,12 @@ cifs_iovec_write(struct file *file, const struct iovec *iov, xid = GetXid(); open_file = file->private_data; + + if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) + pid = open_file->pid; + else + pid = current->tgid; + pTcon = tlink_tcon(open_file->tlink); inode = file->f_path.dentry->d_inode; @@ -1581,7 +1595,7 @@ cifs_iovec_write(struct file *file, const struct iovec *iov, break; } io_parms.netfid = open_file->netfid; - io_parms.pid = current->tgid; + io_parms.pid = pid; io_parms.tcon = pTcon; io_parms.offset = *poffset; io_parms.length = cur_len; @@ -1682,7 +1696,9 @@ cifs_iovec_read(struct file *file, const struct iovec *iov, struct cifsTconInfo *pTcon; struct cifsFileInfo *open_file; struct smb_com_read_rsp *pSMBr; + struct cifs_io_parms io_parms; char *read_data; + __u32 pid; if (!nr_segs) return 0; @@ -1697,6 +1713,11 @@ cifs_iovec_read(struct file *file, const struct iovec *iov, open_file = file->private_data; pTcon = tlink_tcon(open_file->tlink); + if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) + pid = open_file->pid; + else + pid = current->tgid; + if ((file->f_flags & O_ACCMODE) == O_WRONLY) cFYI(1, "attempting read on write only file instance"); @@ -1712,8 +1733,12 @@ cifs_iovec_read(struct file *file, const struct iovec *iov, if (rc != 0) break; } - rc = CIFSSMBRead(xid, pTcon, open_file->netfid, - cur_len, *poffset, &bytes_read, + io_parms.netfid = open_file->netfid; + io_parms.pid = pid; + io_parms.tcon = pTcon; + io_parms.offset = *poffset; + io_parms.length = len; + rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &read_data, &buf_type); pSMBr = (struct smb_com_read_rsp *)read_data; if (read_data) { @@ -1794,7 +1819,9 @@ static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, int xid; char *current_offset; struct cifsFileInfo *open_file; + struct cifs_io_parms io_parms; int buf_type = CIFS_NO_BUFFER; + __u32 pid; xid = GetXid(); cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); @@ -1807,6 +1834,11 @@ static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, open_file = file->private_data; pTcon = tlink_tcon(open_file->tlink); + if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) + pid = open_file->pid; + else + pid = current->tgid; + if ((file->f_flags & O_ACCMODE) == O_WRONLY) cFYI(1, "attempting read on write only file instance"); @@ -1829,11 +1861,13 @@ static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, if (rc != 0) break; } - rc = CIFSSMBRead(xid, pTcon, - open_file->netfid, - current_read_size, *poffset, - &bytes_read, ¤t_offset, - &buf_type); + io_parms.netfid = open_file->netfid; + io_parms.pid = pid; + io_parms.tcon = pTcon; + io_parms.offset = *poffset; + io_parms.length = current_read_size; + rc = CIFSSMBRead(xid, &io_parms, &bytes_read, + ¤t_offset, &buf_type); } if (rc || (bytes_read == 0)) { if (total_read) { @@ -1970,7 +2004,9 @@ static int cifs_readpages(struct file *file, struct address_space *mapping, char *smb_read_data = NULL; struct smb_com_read_rsp *pSMBr; struct cifsFileInfo *open_file; + struct cifs_io_parms io_parms; int buf_type = CIFS_NO_BUFFER; + __u32 pid; xid = GetXid(); if (file->private_data == NULL) { @@ -1992,6 +2028,11 @@ static int cifs_readpages(struct file *file, struct address_space *mapping, goto read_complete; cFYI(DBG2, "rpages: num pages %d", num_pages); + if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) + pid = open_file->pid; + else + pid = current->tgid; + for (i = 0; i < num_pages; ) { unsigned contig_pages; struct page *tmp_page; @@ -2033,12 +2074,13 @@ static int cifs_readpages(struct file *file, struct address_space *mapping, if (rc != 0) break; } - - rc = CIFSSMBRead(xid, pTcon, - open_file->netfid, - read_size, offset, - &bytes_read, &smb_read_data, - &buf_type); + io_parms.netfid = open_file->netfid; + io_parms.pid = pid; + io_parms.tcon = pTcon; + io_parms.offset = offset; + io_parms.length = read_size; + rc = CIFSSMBRead(xid, &io_parms, &bytes_read, + &smb_read_data, &buf_type); /* BB more RC checks ? */ if (rc == -EAGAIN) { if (smb_read_data) { diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c index 53ea6250a51..e2d9dd817ba 100644 --- a/fs/cifs/inode.c +++ b/fs/cifs/inode.c @@ -374,6 +374,7 @@ cifs_sfu_type(struct cifs_fattr *fattr, const unsigned char *path, __u16 netfid; struct tcon_link *tlink; struct cifsTconInfo *tcon; + struct cifs_io_parms io_parms; char buf[24]; unsigned int bytes_read; char *pbuf; @@ -405,9 +406,13 @@ cifs_sfu_type(struct cifs_fattr *fattr, const unsigned char *path, if (rc == 0) { int buf_type = CIFS_NO_BUFFER; /* Read header */ - rc = CIFSSMBRead(xid, tcon, netfid, - 24 /* length */, 0 /* offset */, - &bytes_read, &pbuf, &buf_type); + io_parms.netfid = netfid; + io_parms.pid = current->tgid; + io_parms.tcon = tcon; + io_parms.offset = 0; + io_parms.length = 24; + rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &pbuf, + &buf_type); if ((rc == 0) && (bytes_read >= 8)) { if (memcmp("IntxBLK", pbuf, 8) == 0) { cFYI(1, "Block device"); diff --git a/fs/cifs/link.c b/fs/cifs/link.c index 1a6a388cf5d..4682d44b6f5 100644 --- a/fs/cifs/link.c +++ b/fs/cifs/link.c @@ -235,6 +235,7 @@ CIFSQueryMFSymLink(const int xid, struct cifsTconInfo *tcon, unsigned int bytes_read = 0; int buf_type = CIFS_NO_BUFFER; unsigned int link_len = 0; + struct cifs_io_parms io_parms; FILE_ALL_INFO file_info; rc = CIFSSMBOpen(xid, tcon, searchName, FILE_OPEN, GENERIC_READ, @@ -253,11 +254,13 @@ CIFSQueryMFSymLink(const int xid, struct cifsTconInfo *tcon, if (!buf) return -ENOMEM; pbuf = buf; + io_parms.netfid = netfid; + io_parms.pid = current->tgid; + io_parms.tcon = tcon; + io_parms.offset = 0; + io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE; - rc = CIFSSMBRead(xid, tcon, netfid, - CIFS_MF_SYMLINK_FILE_SIZE /* length */, - 0 /* offset */, - &bytes_read, &pbuf, &buf_type); + rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &pbuf, &buf_type); CIFSSMBClose(xid, tcon, netfid); if (rc != 0) { kfree(buf); @@ -296,6 +299,7 @@ CIFSCheckMFSymlink(struct cifs_fattr *fattr, __u16 netfid = 0; struct tcon_link *tlink; struct cifsTconInfo *pTcon; + struct cifs_io_parms io_parms; u8 *buf; char *pbuf; unsigned int bytes_read = 0; @@ -332,11 +336,13 @@ CIFSCheckMFSymlink(struct cifs_fattr *fattr, goto out; } pbuf = buf; + io_parms.netfid = netfid; + io_parms.pid = current->tgid; + io_parms.tcon = pTcon; + io_parms.offset = 0; + io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE; - rc = CIFSSMBRead(xid, pTcon, netfid, - CIFS_MF_SYMLINK_FILE_SIZE /* length */, - 0 /* offset */, - &bytes_read, &pbuf, &buf_type); + rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &pbuf, &buf_type); CIFSSMBClose(xid, pTcon, netfid); if (rc != 0) { kfree(buf); -- cgit v1.2.3-70-g09d2