| /* |
| * fs/cifs/inode.c |
| * |
| * Copyright (C) International Business Machines Corp., 2002,2010 |
| * Author(s): Steve French (sfrench@us.ibm.com) |
| * |
| * This library is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Lesser General Public License as published |
| * by the Free Software Foundation; either version 2.1 of the License, or |
| * (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| * the GNU Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public License |
| * along with this library; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| #include <linux/fs.h> |
| #include <linux/stat.h> |
| #include <linux/slab.h> |
| #include <linux/pagemap.h> |
| #include <linux/freezer.h> |
| #include <asm/div64.h> |
| #include "cifsfs.h" |
| #include "cifspdu.h" |
| #include "cifsglob.h" |
| #include "cifsproto.h" |
| #include "cifs_debug.h" |
| #include "cifs_fs_sb.h" |
| #include "cifs_unicode.h" |
| #include "fscache.h" |
| |
| |
| static void cifs_set_ops(struct inode *inode) |
| { |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| |
| switch (inode->i_mode & S_IFMT) { |
| case S_IFREG: |
| inode->i_op = &cifs_file_inode_ops; |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) |
| inode->i_fop = &cifs_file_direct_nobrl_ops; |
| else |
| inode->i_fop = &cifs_file_direct_ops; |
| } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) { |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) |
| inode->i_fop = &cifs_file_strict_nobrl_ops; |
| else |
| inode->i_fop = &cifs_file_strict_ops; |
| } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) |
| inode->i_fop = &cifs_file_nobrl_ops; |
| else { /* not direct, send byte range locks */ |
| inode->i_fop = &cifs_file_ops; |
| } |
| |
| /* check if server can support readpages */ |
| if (cifs_sb_master_tcon(cifs_sb)->ses->server->maxBuf < |
| PAGE_SIZE + MAX_CIFS_HDR_SIZE) |
| inode->i_data.a_ops = &cifs_addr_ops_smallbuf; |
| else |
| inode->i_data.a_ops = &cifs_addr_ops; |
| break; |
| case S_IFDIR: |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| if (IS_AUTOMOUNT(inode)) { |
| inode->i_op = &cifs_dfs_referral_inode_operations; |
| } else { |
| #else /* NO DFS support, treat as a directory */ |
| { |
| #endif |
| inode->i_op = &cifs_dir_inode_ops; |
| inode->i_fop = &cifs_dir_ops; |
| } |
| break; |
| case S_IFLNK: |
| inode->i_op = &cifs_symlink_inode_ops; |
| break; |
| default: |
| init_special_inode(inode, inode->i_mode, inode->i_rdev); |
| break; |
| } |
| } |
| |
| /* check inode attributes against fattr. If they don't match, tag the |
| * inode for cache invalidation |
| */ |
| static void |
| cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr) |
| { |
| struct cifsInodeInfo *cifs_i = CIFS_I(inode); |
| |
| cifs_dbg(FYI, "%s: revalidating inode %llu\n", |
| __func__, cifs_i->uniqueid); |
| |
| if (inode->i_state & I_NEW) { |
| cifs_dbg(FYI, "%s: inode %llu is new\n", |
| __func__, cifs_i->uniqueid); |
| return; |
| } |
| |
| /* don't bother with revalidation if we have an oplock */ |
| if (CIFS_CACHE_READ(cifs_i)) { |
| cifs_dbg(FYI, "%s: inode %llu is oplocked\n", |
| __func__, cifs_i->uniqueid); |
| return; |
| } |
| |
| /* revalidate if mtime or size have changed */ |
| if (timespec_equal(&inode->i_mtime, &fattr->cf_mtime) && |
| cifs_i->server_eof == fattr->cf_eof) { |
| cifs_dbg(FYI, "%s: inode %llu is unchanged\n", |
| __func__, cifs_i->uniqueid); |
| return; |
| } |
| |
| cifs_dbg(FYI, "%s: invalidating inode %llu mapping\n", |
| __func__, cifs_i->uniqueid); |
| set_bit(CIFS_INO_INVALID_MAPPING, &cifs_i->flags); |
| } |
| |
| /* |
| * copy nlink to the inode, unless it wasn't provided. Provide |
| * sane values if we don't have an existing one and none was provided |
| */ |
| static void |
| cifs_nlink_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr) |
| { |
| /* |
| * if we're in a situation where we can't trust what we |
| * got from the server (readdir, some non-unix cases) |
| * fake reasonable values |
| */ |
| if (fattr->cf_flags & CIFS_FATTR_UNKNOWN_NLINK) { |
| /* only provide fake values on a new inode */ |
| if (inode->i_state & I_NEW) { |
| if (fattr->cf_cifsattrs & ATTR_DIRECTORY) |
| set_nlink(inode, 2); |
| else |
| set_nlink(inode, 1); |
| } |
| return; |
| } |
| |
| /* we trust the server, so update it */ |
| set_nlink(inode, fattr->cf_nlink); |
| } |
| |
| /* populate an inode with info from a cifs_fattr struct */ |
| void |
| cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr) |
| { |
| struct cifsInodeInfo *cifs_i = CIFS_I(inode); |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| |
| cifs_revalidate_cache(inode, fattr); |
| |
| spin_lock(&inode->i_lock); |
| inode->i_atime = fattr->cf_atime; |
| inode->i_mtime = fattr->cf_mtime; |
| inode->i_ctime = fattr->cf_ctime; |
| inode->i_rdev = fattr->cf_rdev; |
| cifs_nlink_fattr_to_inode(inode, fattr); |
| inode->i_uid = fattr->cf_uid; |
| inode->i_gid = fattr->cf_gid; |
| |
| /* if dynperm is set, don't clobber existing mode */ |
| if (inode->i_state & I_NEW || |
| !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) |
| inode->i_mode = fattr->cf_mode; |
| |
| cifs_i->cifsAttrs = fattr->cf_cifsattrs; |
| |
| if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL) |
| cifs_i->time = 0; |
| else |
| cifs_i->time = jiffies; |
| |
| if (fattr->cf_flags & CIFS_FATTR_DELETE_PENDING) |
| set_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags); |
| else |
| clear_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags); |
| |
| cifs_i->server_eof = fattr->cf_eof; |
| /* |
| * Can't safely change the file size here if the client is writing to |
| * it due to potential races. |
| */ |
| if (is_size_safe_to_change(cifs_i, fattr->cf_eof)) { |
| i_size_write(inode, fattr->cf_eof); |
| |
| /* |
| * i_blocks is not related to (i_size / i_blksize), |
| * but instead 512 byte (2**9) size is required for |
| * calculating num blocks. |
| */ |
| inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9; |
| } |
| spin_unlock(&inode->i_lock); |
| |
| if (fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL) |
| inode->i_flags |= S_AUTOMOUNT; |
| if (inode->i_state & I_NEW) |
| cifs_set_ops(inode); |
| } |
| |
| void |
| cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr) |
| { |
| struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) |
| return; |
| |
| fattr->cf_uniqueid = iunique(sb, ROOT_I); |
| } |
| |
| /* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */ |
| void |
| cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info, |
| struct cifs_sb_info *cifs_sb) |
| { |
| memset(fattr, 0, sizeof(*fattr)); |
| fattr->cf_uniqueid = le64_to_cpu(info->UniqueId); |
| fattr->cf_bytes = le64_to_cpu(info->NumOfBytes); |
| fattr->cf_eof = le64_to_cpu(info->EndOfFile); |
| |
| fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime); |
| fattr->cf_mtime = cifs_NTtimeToUnix(info->LastModificationTime); |
| fattr->cf_ctime = cifs_NTtimeToUnix(info->LastStatusChange); |
| fattr->cf_mode = le64_to_cpu(info->Permissions); |
| |
| /* |
| * Since we set the inode type below we need to mask off |
| * to avoid strange results if bits set above. |
| */ |
| fattr->cf_mode &= ~S_IFMT; |
| switch (le32_to_cpu(info->Type)) { |
| case UNIX_FILE: |
| fattr->cf_mode |= S_IFREG; |
| fattr->cf_dtype = DT_REG; |
| break; |
| case UNIX_SYMLINK: |
| fattr->cf_mode |= S_IFLNK; |
| fattr->cf_dtype = DT_LNK; |
| break; |
| case UNIX_DIR: |
| fattr->cf_mode |= S_IFDIR; |
| fattr->cf_dtype = DT_DIR; |
| break; |
| case UNIX_CHARDEV: |
| fattr->cf_mode |= S_IFCHR; |
| fattr->cf_dtype = DT_CHR; |
| fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor), |
| le64_to_cpu(info->DevMinor) & MINORMASK); |
| break; |
| case UNIX_BLOCKDEV: |
| fattr->cf_mode |= S_IFBLK; |
| fattr->cf_dtype = DT_BLK; |
| fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor), |
| le64_to_cpu(info->DevMinor) & MINORMASK); |
| break; |
| case UNIX_FIFO: |
| fattr->cf_mode |= S_IFIFO; |
| fattr->cf_dtype = DT_FIFO; |
| break; |
| case UNIX_SOCKET: |
| fattr->cf_mode |= S_IFSOCK; |
| fattr->cf_dtype = DT_SOCK; |
| break; |
| default: |
| /* safest to call it a file if we do not know */ |
| fattr->cf_mode |= S_IFREG; |
| fattr->cf_dtype = DT_REG; |
| cifs_dbg(FYI, "unknown type %d\n", le32_to_cpu(info->Type)); |
| break; |
| } |
| |
| fattr->cf_uid = cifs_sb->mnt_uid; |
| if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)) { |
| u64 id = le64_to_cpu(info->Uid); |
| if (id < ((uid_t)-1)) { |
| kuid_t uid = make_kuid(&init_user_ns, id); |
| if (uid_valid(uid)) |
| fattr->cf_uid = uid; |
| } |
| } |
| |
| fattr->cf_gid = cifs_sb->mnt_gid; |
| if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)) { |
| u64 id = le64_to_cpu(info->Gid); |
| if (id < ((gid_t)-1)) { |
| kgid_t gid = make_kgid(&init_user_ns, id); |
| if (gid_valid(gid)) |
| fattr->cf_gid = gid; |
| } |
| } |
| |
| fattr->cf_nlink = le64_to_cpu(info->Nlinks); |
| } |
| |
| /* |
| * Fill a cifs_fattr struct with fake inode info. |
| * |
| * Needed to setup cifs_fattr data for the directory which is the |
| * junction to the new submount (ie to setup the fake directory |
| * which represents a DFS referral). |
| */ |
| static void |
| cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb) |
| { |
| struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| |
| cifs_dbg(FYI, "creating fake fattr for DFS referral\n"); |
| |
| memset(fattr, 0, sizeof(*fattr)); |
| fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU; |
| fattr->cf_uid = cifs_sb->mnt_uid; |
| fattr->cf_gid = cifs_sb->mnt_gid; |
| fattr->cf_atime = CURRENT_TIME; |
| fattr->cf_ctime = CURRENT_TIME; |
| fattr->cf_mtime = CURRENT_TIME; |
| fattr->cf_nlink = 2; |
| fattr->cf_flags |= CIFS_FATTR_DFS_REFERRAL; |
| } |
| |
| static int |
| cifs_get_file_info_unix(struct file *filp) |
| { |
| int rc; |
| unsigned int xid; |
| FILE_UNIX_BASIC_INFO find_data; |
| struct cifs_fattr fattr; |
| struct inode *inode = file_inode(filp); |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| struct cifsFileInfo *cfile = filp->private_data; |
| struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
| |
| xid = get_xid(); |
| rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->fid.netfid, &find_data); |
| if (!rc) { |
| cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb); |
| } else if (rc == -EREMOTE) { |
| cifs_create_dfs_fattr(&fattr, inode->i_sb); |
| rc = 0; |
| } |
| |
| cifs_fattr_to_inode(inode, &fattr); |
| free_xid(xid); |
| return rc; |
| } |
| |
| int cifs_get_inode_info_unix(struct inode **pinode, |
| const unsigned char *full_path, |
| struct super_block *sb, unsigned int xid) |
| { |
| int rc; |
| FILE_UNIX_BASIC_INFO find_data; |
| struct cifs_fattr fattr; |
| struct cifs_tcon *tcon; |
| struct tcon_link *tlink; |
| struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| |
| cifs_dbg(FYI, "Getting info on %s\n", full_path); |
| |
| tlink = cifs_sb_tlink(cifs_sb); |
| if (IS_ERR(tlink)) |
| return PTR_ERR(tlink); |
| tcon = tlink_tcon(tlink); |
| |
| /* could have done a find first instead but this returns more info */ |
| rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data, |
| cifs_sb->local_nls, cifs_remap(cifs_sb)); |
| cifs_put_tlink(tlink); |
| |
| if (!rc) { |
| cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb); |
| } else if (rc == -EREMOTE) { |
| cifs_create_dfs_fattr(&fattr, sb); |
| rc = 0; |
| } else { |
| return rc; |
| } |
| |
| /* check for Minshall+French symlinks */ |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) { |
| int tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr, |
| full_path); |
| if (tmprc) |
| cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc); |
| } |
| |
| if (*pinode == NULL) { |
| /* get new inode */ |
| cifs_fill_uniqueid(sb, &fattr); |
| *pinode = cifs_iget(sb, &fattr); |
| if (!*pinode) |
| rc = -ENOMEM; |
| } else { |
| /* we already have inode, update it */ |
| |
| /* if uniqueid is different, return error */ |
| if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM && |
| CIFS_I(*pinode)->uniqueid != fattr.cf_uniqueid)) { |
| rc = -ESTALE; |
| goto cgiiu_exit; |
| } |
| |
| /* if filetype is different, return error */ |
| if (unlikely(((*pinode)->i_mode & S_IFMT) != |
| (fattr.cf_mode & S_IFMT))) { |
| rc = -ESTALE; |
| goto cgiiu_exit; |
| } |
| |
| cifs_fattr_to_inode(*pinode, &fattr); |
| } |
| |
| cgiiu_exit: |
| return rc; |
| } |
| |
| static int |
| cifs_sfu_type(struct cifs_fattr *fattr, const char *path, |
| struct cifs_sb_info *cifs_sb, unsigned int xid) |
| { |
| int rc; |
| __u32 oplock; |
| struct tcon_link *tlink; |
| struct cifs_tcon *tcon; |
| struct cifs_fid fid; |
| struct cifs_open_parms oparms; |
| struct cifs_io_parms io_parms; |
| char buf[24]; |
| unsigned int bytes_read; |
| char *pbuf; |
| int buf_type = CIFS_NO_BUFFER; |
| |
| pbuf = buf; |
| |
| fattr->cf_mode &= ~S_IFMT; |
| |
| if (fattr->cf_eof == 0) { |
| fattr->cf_mode |= S_IFIFO; |
| fattr->cf_dtype = DT_FIFO; |
| return 0; |
| } else if (fattr->cf_eof < 8) { |
| fattr->cf_mode |= S_IFREG; |
| fattr->cf_dtype = DT_REG; |
| return -EINVAL; /* EOPNOTSUPP? */ |
| } |
| |
| tlink = cifs_sb_tlink(cifs_sb); |
| if (IS_ERR(tlink)) |
| return PTR_ERR(tlink); |
| tcon = tlink_tcon(tlink); |
| |
| oparms.tcon = tcon; |
| oparms.cifs_sb = cifs_sb; |
| oparms.desired_access = GENERIC_READ; |
| oparms.create_options = CREATE_NOT_DIR; |
| oparms.disposition = FILE_OPEN; |
| oparms.path = path; |
| oparms.fid = &fid; |
| oparms.reconnect = false; |
| |
| if (tcon->ses->server->oplocks) |
| oplock = REQ_OPLOCK; |
| else |
| oplock = 0; |
| rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, NULL); |
| if (rc) { |
| cifs_dbg(FYI, "check sfu type of %s, open rc = %d\n", path, rc); |
| cifs_put_tlink(tlink); |
| return rc; |
| } |
| |
| /* Read header */ |
| io_parms.netfid = fid.netfid; |
| io_parms.pid = current->tgid; |
| io_parms.tcon = tcon; |
| io_parms.offset = 0; |
| io_parms.length = 24; |
| |
| rc = tcon->ses->server->ops->sync_read(xid, &fid, &io_parms, |
| &bytes_read, &pbuf, &buf_type); |
| if ((rc == 0) && (bytes_read >= 8)) { |
| if (memcmp("IntxBLK", pbuf, 8) == 0) { |
| cifs_dbg(FYI, "Block device\n"); |
| fattr->cf_mode |= S_IFBLK; |
| fattr->cf_dtype = DT_BLK; |
| if (bytes_read == 24) { |
| /* we have enough to decode dev num */ |
| __u64 mjr; /* major */ |
| __u64 mnr; /* minor */ |
| mjr = le64_to_cpu(*(__le64 *)(pbuf+8)); |
| mnr = le64_to_cpu(*(__le64 *)(pbuf+16)); |
| fattr->cf_rdev = MKDEV(mjr, mnr); |
| } |
| } else if (memcmp("IntxCHR", pbuf, 8) == 0) { |
| cifs_dbg(FYI, "Char device\n"); |
| fattr->cf_mode |= S_IFCHR; |
| fattr->cf_dtype = DT_CHR; |
| if (bytes_read == 24) { |
| /* we have enough to decode dev num */ |
| __u64 mjr; /* major */ |
| __u64 mnr; /* minor */ |
| mjr = le64_to_cpu(*(__le64 *)(pbuf+8)); |
| mnr = le64_to_cpu(*(__le64 *)(pbuf+16)); |
| fattr->cf_rdev = MKDEV(mjr, mnr); |
| } |
| } else if (memcmp("IntxLNK", pbuf, 7) == 0) { |
| cifs_dbg(FYI, "Symlink\n"); |
| fattr->cf_mode |= S_IFLNK; |
| fattr->cf_dtype = DT_LNK; |
| } else { |
| fattr->cf_mode |= S_IFREG; /* file? */ |
| fattr->cf_dtype = DT_REG; |
| rc = -EOPNOTSUPP; |
| } |
| } else { |
| fattr->cf_mode |= S_IFREG; /* then it is a file */ |
| fattr->cf_dtype = DT_REG; |
| rc = -EOPNOTSUPP; /* or some unknown SFU type */ |
| } |
| |
| tcon->ses->server->ops->close(xid, tcon, &fid); |
| cifs_put_tlink(tlink); |
| return rc; |
| } |
| |
| #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */ |
| |
| /* |
| * Fetch mode bits as provided by SFU. |
| * |
| * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ? |
| */ |
| static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path, |
| struct cifs_sb_info *cifs_sb, unsigned int xid) |
| { |
| #ifdef CONFIG_CIFS_XATTR |
| ssize_t rc; |
| char ea_value[4]; |
| __u32 mode; |
| struct tcon_link *tlink; |
| struct cifs_tcon *tcon; |
| |
| tlink = cifs_sb_tlink(cifs_sb); |
| if (IS_ERR(tlink)) |
| return PTR_ERR(tlink); |
| tcon = tlink_tcon(tlink); |
| |
| if (tcon->ses->server->ops->query_all_EAs == NULL) { |
| cifs_put_tlink(tlink); |
| return -EOPNOTSUPP; |
| } |
| |
| rc = tcon->ses->server->ops->query_all_EAs(xid, tcon, path, |
| "SETFILEBITS", ea_value, 4 /* size of buf */, |
| cifs_sb->local_nls, |
| cifs_remap(cifs_sb)); |
| cifs_put_tlink(tlink); |
| if (rc < 0) |
| return (int)rc; |
| else if (rc > 3) { |
| mode = le32_to_cpu(*((__le32 *)ea_value)); |
| fattr->cf_mode &= ~SFBITS_MASK; |
| cifs_dbg(FYI, "special bits 0%o org mode 0%o\n", |
| mode, fattr->cf_mode); |
| fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode; |
| cifs_dbg(FYI, "special mode bits 0%o\n", mode); |
| } |
| |
| return 0; |
| #else |
| return -EOPNOTSUPP; |
| #endif |
| } |
| |
| /* Fill a cifs_fattr struct with info from FILE_ALL_INFO */ |
| static void |
| cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info, |
| struct cifs_sb_info *cifs_sb, bool adjust_tz, |
| bool symlink) |
| { |
| struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); |
| |
| memset(fattr, 0, sizeof(*fattr)); |
| fattr->cf_cifsattrs = le32_to_cpu(info->Attributes); |
| if (info->DeletePending) |
| fattr->cf_flags |= CIFS_FATTR_DELETE_PENDING; |
| |
| if (info->LastAccessTime) |
| fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime); |
| else |
| fattr->cf_atime = CURRENT_TIME; |
| |
| fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime); |
| fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime); |
| |
| if (adjust_tz) { |
| fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj; |
| fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj; |
| } |
| |
| fattr->cf_eof = le64_to_cpu(info->EndOfFile); |
| fattr->cf_bytes = le64_to_cpu(info->AllocationSize); |
| fattr->cf_createtime = le64_to_cpu(info->CreationTime); |
| |
| fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks); |
| |
| if (symlink) { |
| fattr->cf_mode = S_IFLNK; |
| fattr->cf_dtype = DT_LNK; |
| } else if (fattr->cf_cifsattrs & ATTR_DIRECTORY) { |
| fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode; |
| fattr->cf_dtype = DT_DIR; |
| /* |
| * Server can return wrong NumberOfLinks value for directories |
| * when Unix extensions are disabled - fake it. |
| */ |
| if (!tcon->unix_ext) |
| fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK; |
| } else { |
| fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode; |
| fattr->cf_dtype = DT_REG; |
| |
| /* clear write bits if ATTR_READONLY is set */ |
| if (fattr->cf_cifsattrs & ATTR_READONLY) |
| fattr->cf_mode &= ~(S_IWUGO); |
| |
| /* |
| * Don't accept zero nlink from non-unix servers unless |
| * delete is pending. Instead mark it as unknown. |
| */ |
| if ((fattr->cf_nlink < 1) && !tcon->unix_ext && |
| !info->DeletePending) { |
| cifs_dbg(1, "bogus file nlink value %u\n", |
| fattr->cf_nlink); |
| fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK; |
| } |
| } |
| |
| fattr->cf_uid = cifs_sb->mnt_uid; |
| fattr->cf_gid = cifs_sb->mnt_gid; |
| } |
| |
| static int |
| cifs_get_file_info(struct file *filp) |
| { |
| int rc; |
| unsigned int xid; |
| FILE_ALL_INFO find_data; |
| struct cifs_fattr fattr; |
| struct inode *inode = file_inode(filp); |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| struct cifsFileInfo *cfile = filp->private_data; |
| struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
| struct TCP_Server_Info *server = tcon->ses->server; |
| |
| if (!server->ops->query_file_info) |
| return -ENOSYS; |
| |
| xid = get_xid(); |
| rc = server->ops->query_file_info(xid, tcon, &cfile->fid, &find_data); |
| switch (rc) { |
| case 0: |
| cifs_all_info_to_fattr(&fattr, &find_data, cifs_sb, false, |
| false); |
| break; |
| case -EREMOTE: |
| cifs_create_dfs_fattr(&fattr, inode->i_sb); |
| rc = 0; |
| break; |
| case -EOPNOTSUPP: |
| case -EINVAL: |
| /* |
| * FIXME: legacy server -- fall back to path-based call? |
| * for now, just skip revalidating and mark inode for |
| * immediate reval. |
| */ |
| rc = 0; |
| CIFS_I(inode)->time = 0; |
| default: |
| goto cgfi_exit; |
| } |
| |
| /* |
| * don't bother with SFU junk here -- just mark inode as needing |
| * revalidation. |
| */ |
| fattr.cf_uniqueid = CIFS_I(inode)->uniqueid; |
| fattr.cf_flags |= CIFS_FATTR_NEED_REVAL; |
| cifs_fattr_to_inode(inode, &fattr); |
| cgfi_exit: |
| free_xid(xid); |
| return rc; |
| } |
| |
| int |
| cifs_get_inode_info(struct inode **inode, const char *full_path, |
| FILE_ALL_INFO *data, struct super_block *sb, int xid, |
| const struct cifs_fid *fid) |
| { |
| bool validinum = false; |
| __u16 srchflgs; |
| int rc = 0, tmprc = ENOSYS; |
| struct cifs_tcon *tcon; |
| struct TCP_Server_Info *server; |
| struct tcon_link *tlink; |
| struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| char *buf = NULL; |
| bool adjust_tz = false; |
| struct cifs_fattr fattr; |
| struct cifs_search_info *srchinf = NULL; |
| bool symlink = false; |
| |
| tlink = cifs_sb_tlink(cifs_sb); |
| if (IS_ERR(tlink)) |
| return PTR_ERR(tlink); |
| tcon = tlink_tcon(tlink); |
| server = tcon->ses->server; |
| |
| cifs_dbg(FYI, "Getting info on %s\n", full_path); |
| |
| if ((data == NULL) && (*inode != NULL)) { |
| if (CIFS_CACHE_READ(CIFS_I(*inode))) { |
| cifs_dbg(FYI, "No need to revalidate cached inode sizes\n"); |
| goto cgii_exit; |
| } |
| } |
| |
| /* if inode info is not passed, get it from server */ |
| if (data == NULL) { |
| if (!server->ops->query_path_info) { |
| rc = -ENOSYS; |
| goto cgii_exit; |
| } |
| buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); |
| if (buf == NULL) { |
| rc = -ENOMEM; |
| goto cgii_exit; |
| } |
| data = (FILE_ALL_INFO *)buf; |
| rc = server->ops->query_path_info(xid, tcon, cifs_sb, full_path, |
| data, &adjust_tz, &symlink); |
| } |
| |
| if (!rc) { |
| cifs_all_info_to_fattr(&fattr, data, cifs_sb, adjust_tz, |
| symlink); |
| } else if (rc == -EREMOTE) { |
| cifs_create_dfs_fattr(&fattr, sb); |
| rc = 0; |
| } else if (rc == -EACCES && backup_cred(cifs_sb)) { |
| srchinf = kzalloc(sizeof(struct cifs_search_info), |
| GFP_KERNEL); |
| if (srchinf == NULL) { |
| rc = -ENOMEM; |
| goto cgii_exit; |
| } |
| |
| srchinf->endOfSearch = false; |
| srchinf->info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO; |
| |
| srchflgs = CIFS_SEARCH_CLOSE_ALWAYS | |
| CIFS_SEARCH_CLOSE_AT_END | |
| CIFS_SEARCH_BACKUP_SEARCH; |
| |
| rc = CIFSFindFirst(xid, tcon, full_path, |
| cifs_sb, NULL, srchflgs, srchinf, false); |
| if (!rc) { |
| data = |
| (FILE_ALL_INFO *)srchinf->srch_entries_start; |
| |
| cifs_dir_info_to_fattr(&fattr, |
| (FILE_DIRECTORY_INFO *)data, cifs_sb); |
| fattr.cf_uniqueid = le64_to_cpu( |
| ((SEARCH_ID_FULL_DIR_INFO *)data)->UniqueId); |
| validinum = true; |
| |
| cifs_buf_release(srchinf->ntwrk_buf_start); |
| } |
| kfree(srchinf); |
| if (rc) |
| goto cgii_exit; |
| } else |
| goto cgii_exit; |
| |
| /* |
| * If an inode wasn't passed in, then get the inode number |
| * |
| * Is an i_ino of zero legal? Can we use that to check if the server |
| * supports returning inode numbers? Are there other sanity checks we |
| * can use to ensure that the server is really filling in that field? |
| */ |
| if (*inode == NULL) { |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { |
| if (validinum == false) { |
| if (server->ops->get_srv_inum) |
| tmprc = server->ops->get_srv_inum(xid, |
| tcon, cifs_sb, full_path, |
| &fattr.cf_uniqueid, data); |
| if (tmprc) { |
| cifs_dbg(FYI, "GetSrvInodeNum rc %d\n", |
| tmprc); |
| fattr.cf_uniqueid = iunique(sb, ROOT_I); |
| cifs_autodisable_serverino(cifs_sb); |
| } |
| } |
| } else |
| fattr.cf_uniqueid = iunique(sb, ROOT_I); |
| } else { |
| if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) && |
| validinum == false && server->ops->get_srv_inum) { |
| /* |
| * Pass a NULL tcon to ensure we don't make a round |
| * trip to the server. This only works for SMB2+. |
| */ |
| tmprc = server->ops->get_srv_inum(xid, |
| NULL, cifs_sb, full_path, |
| &fattr.cf_uniqueid, data); |
| if (tmprc) |
| fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid; |
| } else |
| fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid; |
| } |
| |
| /* query for SFU type info if supported and needed */ |
| if (fattr.cf_cifsattrs & ATTR_SYSTEM && |
| cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) { |
| tmprc = cifs_sfu_type(&fattr, full_path, cifs_sb, xid); |
| if (tmprc) |
| cifs_dbg(FYI, "cifs_sfu_type failed: %d\n", tmprc); |
| } |
| |
| #ifdef CONFIG_CIFS_ACL |
| /* fill in 0777 bits from ACL */ |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) { |
| rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, full_path, fid); |
| if (rc) { |
| cifs_dbg(FYI, "%s: Getting ACL failed with error: %d\n", |
| __func__, rc); |
| goto cgii_exit; |
| } |
| } |
| #endif /* CONFIG_CIFS_ACL */ |
| |
| /* fill in remaining high mode bits e.g. SUID, VTX */ |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) |
| cifs_sfu_mode(&fattr, full_path, cifs_sb, xid); |
| |
| /* check for Minshall+French symlinks */ |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) { |
| tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr, |
| full_path); |
| if (tmprc) |
| cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc); |
| } |
| |
| if (!*inode) { |
| *inode = cifs_iget(sb, &fattr); |
| if (!*inode) |
| rc = -ENOMEM; |
| } else { |
| /* we already have inode, update it */ |
| |
| /* if uniqueid is different, return error */ |
| if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM && |
| CIFS_I(*inode)->uniqueid != fattr.cf_uniqueid)) { |
| rc = -ESTALE; |
| goto cgii_exit; |
| } |
| |
| /* if filetype is different, return error */ |
| if (unlikely(((*inode)->i_mode & S_IFMT) != |
| (fattr.cf_mode & S_IFMT))) { |
| rc = -ESTALE; |
| goto cgii_exit; |
| } |
| |
| cifs_fattr_to_inode(*inode, &fattr); |
| } |
| |
| cgii_exit: |
| kfree(buf); |
| cifs_put_tlink(tlink); |
| return rc; |
| } |
| |
| static const struct inode_operations cifs_ipc_inode_ops = { |
| .lookup = cifs_lookup, |
| }; |
| |
| static int |
| cifs_find_inode(struct inode *inode, void *opaque) |
| { |
| struct cifs_fattr *fattr = (struct cifs_fattr *) opaque; |
| |
| /* don't match inode with different uniqueid */ |
| if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid) |
| return 0; |
| |
| /* use createtime like an i_generation field */ |
| if (CIFS_I(inode)->createtime != fattr->cf_createtime) |
| return 0; |
| |
| /* don't match inode of different type */ |
| if ((inode->i_mode & S_IFMT) != (fattr->cf_mode & S_IFMT)) |
| return 0; |
| |
| /* if it's not a directory or has no dentries, then flag it */ |
| if (S_ISDIR(inode->i_mode) && !hlist_empty(&inode->i_dentry)) |
| fattr->cf_flags |= CIFS_FATTR_INO_COLLISION; |
| |
| return 1; |
| } |
| |
| static int |
| cifs_init_inode(struct inode *inode, void *opaque) |
| { |
| struct cifs_fattr *fattr = (struct cifs_fattr *) opaque; |
| |
| CIFS_I(inode)->uniqueid = fattr->cf_uniqueid; |
| CIFS_I(inode)->createtime = fattr->cf_createtime; |
| return 0; |
| } |
| |
| /* |
| * walk dentry list for an inode and report whether it has aliases that |
| * are hashed. We use this to determine if a directory inode can actually |
| * be used. |
| */ |
| static bool |
| inode_has_hashed_dentries(struct inode *inode) |
| { |
| struct dentry *dentry; |
| |
| spin_lock(&inode->i_lock); |
| hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) { |
| if (!d_unhashed(dentry) || IS_ROOT(dentry)) { |
| spin_unlock(&inode->i_lock); |
| return true; |
| } |
| } |
| spin_unlock(&inode->i_lock); |
| return false; |
| } |
| |
| /* Given fattrs, get a corresponding inode */ |
| struct inode * |
| cifs_iget(struct super_block *sb, struct cifs_fattr *fattr) |
| { |
| unsigned long hash; |
| struct inode *inode; |
| |
| retry_iget5_locked: |
| cifs_dbg(FYI, "looking for uniqueid=%llu\n", fattr->cf_uniqueid); |
| |
| /* hash down to 32-bits on 32-bit arch */ |
| hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid); |
| |
| inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr); |
| if (inode) { |
| /* was there a potentially problematic inode collision? */ |
| if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) { |
| fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION; |
| |
| if (inode_has_hashed_dentries(inode)) { |
| cifs_autodisable_serverino(CIFS_SB(sb)); |
| iput(inode); |
| fattr->cf_uniqueid = iunique(sb, ROOT_I); |
| goto retry_iget5_locked; |
| } |
| } |
| |
| cifs_fattr_to_inode(inode, fattr); |
| if (sb->s_flags & MS_NOATIME) |
| inode->i_flags |= S_NOATIME | S_NOCMTIME; |
| if (inode->i_state & I_NEW) { |
| inode->i_ino = hash; |
| #ifdef CONFIG_CIFS_FSCACHE |
| /* initialize per-inode cache cookie pointer */ |
| CIFS_I(inode)->fscache = NULL; |
| #endif |
| unlock_new_inode(inode); |
| } |
| } |
| |
| return inode; |
| } |
| |
| /* gets root inode */ |
| struct inode *cifs_root_iget(struct super_block *sb) |
| { |
| unsigned int xid; |
| struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| struct inode *inode = NULL; |
| long rc; |
| struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); |
| |
| xid = get_xid(); |
| if (tcon->unix_ext) { |
| rc = cifs_get_inode_info_unix(&inode, "", sb, xid); |
| /* some servers mistakenly claim POSIX support */ |
| if (rc != -EOPNOTSUPP) |
| goto iget_no_retry; |
| cifs_dbg(VFS, "server does not support POSIX extensions"); |
| tcon->unix_ext = false; |
| } |
| |
| rc = cifs_get_inode_info(&inode, "", NULL, sb, xid, NULL); |
| |
| iget_no_retry: |
| if (!inode) { |
| inode = ERR_PTR(rc); |
| goto out; |
| } |
| |
| #ifdef CONFIG_CIFS_FSCACHE |
| /* populate tcon->resource_id */ |
| tcon->resource_id = CIFS_I(inode)->uniqueid; |
| #endif |
| |
| if (rc && tcon->ipc) { |
| cifs_dbg(FYI, "ipc connection - fake read inode\n"); |
| spin_lock(&inode->i_lock); |
| inode->i_mode |= S_IFDIR; |
| set_nlink(inode, 2); |
| inode->i_op = &cifs_ipc_inode_ops; |
| inode->i_fop = &simple_dir_operations; |
| inode->i_uid = cifs_sb->mnt_uid; |
| inode->i_gid = cifs_sb->mnt_gid; |
| spin_unlock(&inode->i_lock); |
| } else if (rc) { |
| iget_failed(inode); |
| inode = ERR_PTR(rc); |
| } |
| |
| out: |
| /* can not call macro free_xid here since in a void func |
| * TODO: This is no longer true |
| */ |
| _free_xid(xid); |
| return inode; |
| } |
| |
| int |
| cifs_set_file_info(struct inode *inode, struct iattr *attrs, unsigned int xid, |
| char *full_path, __u32 dosattr) |
| { |
| bool set_time = false; |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| struct TCP_Server_Info *server; |
| FILE_BASIC_INFO info_buf; |
| |
| if (attrs == NULL) |
| return -EINVAL; |
| |
| server = cifs_sb_master_tcon(cifs_sb)->ses->server; |
| if (!server->ops->set_file_info) |
| return -ENOSYS; |
| |
| if (attrs->ia_valid & ATTR_ATIME) { |
| set_time = true; |
| info_buf.LastAccessTime = |
| cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime)); |
| } else |
| info_buf.LastAccessTime = 0; |
| |
| if (attrs->ia_valid & ATTR_MTIME) { |
| set_time = true; |
| info_buf.LastWriteTime = |
| cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime)); |
| } else |
| info_buf.LastWriteTime = 0; |
| |
| /* |
| * Samba throws this field away, but windows may actually use it. |
| * Do not set ctime unless other time stamps are changed explicitly |
| * (i.e. by utimes()) since we would then have a mix of client and |
| * server times. |
| */ |
| if (set_time && (attrs->ia_valid & ATTR_CTIME)) { |
| cifs_dbg(FYI, "CIFS - CTIME changed\n"); |
| info_buf.ChangeTime = |
| cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime)); |
| } else |
| info_buf.ChangeTime = 0; |
| |
| info_buf.CreationTime = 0; /* don't change */ |
| info_buf.Attributes = cpu_to_le32(dosattr); |
| |
| return server->ops->set_file_info(inode, full_path, &info_buf, xid); |
| } |
| |
| /* |
| * Open the given file (if it isn't already), set the DELETE_ON_CLOSE bit |
| * and rename it to a random name that hopefully won't conflict with |
| * anything else. |
| */ |
| int |
| cifs_rename_pending_delete(const char *full_path, struct dentry *dentry, |
| const unsigned int xid) |
| { |
| int oplock = 0; |
| int rc; |
| struct cifs_fid fid; |
| struct cifs_open_parms oparms; |
| struct inode *inode = d_inode(dentry); |
| struct cifsInodeInfo *cifsInode = CIFS_I(inode); |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| struct tcon_link *tlink; |
| struct cifs_tcon *tcon; |
| __u32 dosattr, origattr; |
| FILE_BASIC_INFO *info_buf = NULL; |
| |
| tlink = cifs_sb_tlink(cifs_sb); |
| if (IS_ERR(tlink)) |
| return PTR_ERR(tlink); |
| tcon = tlink_tcon(tlink); |
| |
| /* |
| * We cannot rename the file if the server doesn't support |
| * CAP_INFOLEVEL_PASSTHRU |
| */ |
| if (!(tcon->ses->capabilities & CAP_INFOLEVEL_PASSTHRU)) { |
| rc = -EBUSY; |
| goto out; |
| } |
| |
| oparms.tcon = tcon; |
| oparms.cifs_sb = cifs_sb; |
| oparms.desired_access = DELETE | FILE_WRITE_ATTRIBUTES; |
| oparms.create_options = CREATE_NOT_DIR; |
| oparms.disposition = FILE_OPEN; |
| oparms.path = full_path; |
| oparms.fid = &fid; |
| oparms.reconnect = false; |
| |
| rc = CIFS_open(xid, &oparms, &oplock, NULL); |
| if (rc != 0) |
| goto out; |
| |
| origattr = cifsInode->cifsAttrs; |
| if (origattr == 0) |
| origattr |= ATTR_NORMAL; |
| |
| dosattr = origattr & ~ATTR_READONLY; |
| if (dosattr == 0) |
| dosattr |= ATTR_NORMAL; |
| dosattr |= ATTR_HIDDEN; |
| |
| /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */ |
| if (dosattr != origattr) { |
| info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL); |
| if (info_buf == NULL) { |
| rc = -ENOMEM; |
| goto out_close; |
| } |
| info_buf->Attributes = cpu_to_le32(dosattr); |
| rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid, |
| current->tgid); |
| /* although we would like to mark the file hidden |
| if that fails we will still try to rename it */ |
| if (!rc) |
| cifsInode->cifsAttrs = dosattr; |
| else |
| dosattr = origattr; /* since not able to change them */ |
| } |
| |
| /* rename the file */ |
| rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, NULL, |
| cifs_sb->local_nls, |
| cifs_remap(cifs_sb)); |
| if (rc != 0) { |
| rc = -EBUSY; |
| goto undo_setattr; |
| } |
| |
| /* try to set DELETE_ON_CLOSE */ |
| if (!test_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags)) { |
| rc = CIFSSMBSetFileDisposition(xid, tcon, true, fid.netfid, |
| current->tgid); |
| /* |
| * some samba versions return -ENOENT when we try to set the |
| * file disposition here. Likely a samba bug, but work around |
| * it for now. This means that some cifsXXX files may hang |
| * around after they shouldn't. |
| * |
| * BB: remove this hack after more servers have the fix |
| */ |
| if (rc == -ENOENT) |
| rc = 0; |
| else if (rc != 0) { |
| rc = -EBUSY; |
| goto undo_rename; |
| } |
| set_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags); |
| } |
| |
| out_close: |
| CIFSSMBClose(xid, tcon, fid.netfid); |
| out: |
| kfree(info_buf); |
| cifs_put_tlink(tlink); |
| return rc; |
| |
| /* |
| * reset everything back to the original state. Don't bother |
| * dealing with errors here since we can't do anything about |
| * them anyway. |
| */ |
| undo_rename: |
| CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, dentry->d_name.name, |
| cifs_sb->local_nls, cifs_remap(cifs_sb)); |
| undo_setattr: |
| if (dosattr != origattr) { |
| info_buf->Attributes = cpu_to_le32(origattr); |
| if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid, |
| current->tgid)) |
| cifsInode->cifsAttrs = origattr; |
| } |
| |
| goto out_close; |
| } |
| |
| /* copied from fs/nfs/dir.c with small changes */ |
| static void |
| cifs_drop_nlink(struct inode *inode) |
| { |
| spin_lock(&inode->i_lock); |
| if (inode->i_nlink > 0) |
| drop_nlink(inode); |
| spin_unlock(&inode->i_lock); |
| } |
| |
| /* |
| * If d_inode(dentry) is null (usually meaning the cached dentry |
| * is a negative dentry) then we would attempt a standard SMB delete, but |
| * if that fails we can not attempt the fall back mechanisms on EACCESS |
| * but will return the EACCESS to the caller. Note that the VFS does not call |
| * unlink on negative dentries currently. |
| */ |
| int cifs_unlink(struct inode *dir, struct dentry *dentry) |
| { |
| int rc = 0; |
| unsigned int xid; |
| char *full_path = NULL; |
| struct inode *inode = d_inode(dentry); |
| struct cifsInodeInfo *cifs_inode; |
| struct super_block *sb = dir->i_sb; |
| struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| struct tcon_link *tlink; |
| struct cifs_tcon *tcon; |
| struct TCP_Server_Info *server; |
| struct iattr *attrs = NULL; |
| __u32 dosattr = 0, origattr = 0; |
| |
| cifs_dbg(FYI, "cifs_unlink, dir=0x%p, dentry=0x%p\n", dir, dentry); |
| |
| tlink = cifs_sb_tlink(cifs_sb); |
| if (IS_ERR(tlink)) |
| return PTR_ERR(tlink); |
| tcon = tlink_tcon(tlink); |
| server = tcon->ses->server; |
| |
| xid = get_xid(); |
| |
| /* Unlink can be called from rename so we can not take the |
| * sb->s_vfs_rename_mutex here */ |
| full_path = build_path_from_dentry(dentry); |
| if (full_path == NULL) { |
| rc = -ENOMEM; |
| goto unlink_out; |
| } |
| |
| if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
| le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
| rc = CIFSPOSIXDelFile(xid, tcon, full_path, |
| SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls, |
| cifs_remap(cifs_sb)); |
| cifs_dbg(FYI, "posix del rc %d\n", rc); |
| if ((rc == 0) || (rc == -ENOENT)) |
| goto psx_del_no_retry; |
| } |
| |
| retry_std_delete: |
| if (!server->ops->unlink) { |
| rc = -ENOSYS; |
| goto psx_del_no_retry; |
| } |
| |
| rc = server->ops->unlink(xid, tcon, full_path, cifs_sb); |
| |
| psx_del_no_retry: |
| if (!rc) { |
| if (inode) |
| cifs_drop_nlink(inode); |
| } else if (rc == -ENOENT) { |
| d_drop(dentry); |
| } else if (rc == -EBUSY) { |
| if (server->ops->rename_pending_delete) { |
| rc = server->ops->rename_pending_delete(full_path, |
| dentry, xid); |
| if (rc == 0) |
| cifs_drop_nlink(inode); |
| } |
| } else if ((rc == -EACCES) && (dosattr == 0) && inode) { |
| attrs = kzalloc(sizeof(*attrs), GFP_KERNEL); |
| if (attrs == NULL) { |
| rc = -ENOMEM; |
| goto out_reval; |
| } |
| |
| /* try to reset dos attributes */ |
| cifs_inode = CIFS_I(inode); |
| origattr = cifs_inode->cifsAttrs; |
| if (origattr == 0) |
| origattr |= ATTR_NORMAL; |
| dosattr = origattr & ~ATTR_READONLY; |
| if (dosattr == 0) |
| dosattr |= ATTR_NORMAL; |
| dosattr |= ATTR_HIDDEN; |
| |
| rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr); |
| if (rc != 0) |
| goto out_reval; |
| |
| goto retry_std_delete; |
| } |
| |
| /* undo the setattr if we errored out and it's needed */ |
| if (rc != 0 && dosattr != 0) |
| cifs_set_file_info(inode, attrs, xid, full_path, origattr); |
| |
| out_reval: |
| if (inode) { |
| cifs_inode = CIFS_I(inode); |
| cifs_inode->time = 0; /* will force revalidate to get info |
| when needed */ |
| inode->i_ctime = current_fs_time(sb); |
| } |
| dir->i_ctime = dir->i_mtime = current_fs_time(sb); |
| cifs_inode = CIFS_I(dir); |
| CIFS_I(dir)->time = 0; /* force revalidate of dir as well */ |
| unlink_out: |
| kfree(full_path); |
| kfree(attrs); |
| free_xid(xid); |
| cifs_put_tlink(tlink); |
| return rc; |
| } |
| |
| static int |
| cifs_mkdir_qinfo(struct inode *parent, struct dentry *dentry, umode_t mode, |
| const char *full_path, struct cifs_sb_info *cifs_sb, |
| struct cifs_tcon *tcon, const unsigned int xid) |
| { |
| int rc = 0; |
| struct inode *inode = NULL; |
| |
| if (tcon->unix_ext) |
| rc = cifs_get_inode_info_unix(&inode, full_path, parent->i_sb, |
| xid); |
| else |
| rc = cifs_get_inode_info(&inode, full_path, NULL, parent->i_sb, |
| xid, NULL); |
| |
| if (rc) |
| return rc; |
| |
| /* |
| * setting nlink not necessary except in cases where we failed to get it |
| * from the server or was set bogus. Also, since this is a brand new |
| * inode, no need to grab the i_lock before setting the i_nlink. |
| */ |
| if (inode->i_nlink < 2) |
| set_nlink(inode, 2); |
| mode &= ~current_umask(); |
| /* must turn on setgid bit if parent dir has it */ |
| if (parent->i_mode & S_ISGID) |
| mode |= S_ISGID; |
| |
| if (tcon->unix_ext) { |
| struct cifs_unix_set_info_args args = { |
| .mode = mode, |
| .ctime = NO_CHANGE_64, |
| .atime = NO_CHANGE_64, |
| .mtime = NO_CHANGE_64, |
| .device = 0, |
| }; |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) { |
| args.uid = current_fsuid(); |
| if (parent->i_mode & S_ISGID) |
| args.gid = parent->i_gid; |
| else |
| args.gid = current_fsgid(); |
| } else { |
| args.uid = INVALID_UID; /* no change */ |
| args.gid = INVALID_GID; /* no change */ |
| } |
| CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, |
| cifs_sb->local_nls, |
| cifs_remap(cifs_sb)); |
| } else { |
| struct TCP_Server_Info *server = tcon->ses->server; |
| if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) && |
| (mode & S_IWUGO) == 0 && server->ops->mkdir_setinfo) |
| server->ops->mkdir_setinfo(inode, full_path, cifs_sb, |
| tcon, xid); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) |
| inode->i_mode = (mode | S_IFDIR); |
| |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) { |
| inode->i_uid = current_fsuid(); |
| if (inode->i_mode & S_ISGID) |
| inode->i_gid = parent->i_gid; |
| else |
| inode->i_gid = current_fsgid(); |
| } |
| } |
| d_instantiate(dentry, inode); |
| return rc; |
| } |
| |
| static int |
| cifs_posix_mkdir(struct inode *inode, struct dentry *dentry, umode_t mode, |
| const char *full_path, struct cifs_sb_info *cifs_sb, |
| struct cifs_tcon *tcon, const unsigned int xid) |
| { |
| int rc = 0; |
| u32 oplock = 0; |
| FILE_UNIX_BASIC_INFO *info = NULL; |
| struct inode *newinode = NULL; |
| struct cifs_fattr fattr; |
| |
| info = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); |
| if (info == NULL) { |
| rc = -ENOMEM; |
| goto posix_mkdir_out; |
| } |
| |
| mode &= ~current_umask(); |
| rc = CIFSPOSIXCreate(xid, tcon, SMB_O_DIRECTORY | SMB_O_CREAT, mode, |
| NULL /* netfid */, info, &oplock, full_path, |
| cifs_sb->local_nls, cifs_remap(cifs_sb)); |
| if (rc == -EOPNOTSUPP) |
| goto posix_mkdir_out; |
| else if (rc) { |
| cifs_dbg(FYI, "posix mkdir returned 0x%x\n", rc); |
| d_drop(dentry); |
| goto posix_mkdir_out; |
| } |
| |
| if (info->Type == cpu_to_le32(-1)) |
| /* no return info, go query for it */ |
| goto posix_mkdir_get_info; |
| /* |
| * BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if |
| * need to set uid/gid. |
| */ |
| |
| cifs_unix_basic_to_fattr(&fattr, info, cifs_sb); |
| cifs_fill_uniqueid(inode->i_sb, &fattr); |
| newinode = cifs_iget(inode->i_sb, &fattr); |
| if (!newinode) |
| goto posix_mkdir_get_info; |
| |
| d_instantiate(dentry, newinode); |
| |
| #ifdef CONFIG_CIFS_DEBUG2 |
| cifs_dbg(FYI, "instantiated dentry %p %pd to inode %p\n", |
| dentry, dentry, newinode); |
| |
| if (newinode->i_nlink != 2) |
| cifs_dbg(FYI, "unexpected number of links %d\n", |
| newinode->i_nlink); |
| #endif |
| |
| posix_mkdir_out: |
| kfree(info); |
| return rc; |
| posix_mkdir_get_info: |
| rc = cifs_mkdir_qinfo(inode, dentry, mode, full_path, cifs_sb, tcon, |
| xid); |
| goto posix_mkdir_out; |
| } |
| |
| int cifs_mkdir(struct inode *inode, struct dentry *direntry, umode_t mode) |
| { |
| int rc = 0; |
| unsigned int xid; |
| struct cifs_sb_info *cifs_sb; |
| struct tcon_link *tlink; |
| struct cifs_tcon *tcon; |
| struct TCP_Server_Info *server; |
| char *full_path; |
| |
| cifs_dbg(FYI, "In cifs_mkdir, mode = 0x%hx inode = 0x%p\n", |
| mode, inode); |
| |
| cifs_sb = CIFS_SB(inode->i_sb); |
| tlink = cifs_sb_tlink(cifs_sb); |
| if (IS_ERR(tlink)) |
| return PTR_ERR(tlink); |
| tcon = tlink_tcon(tlink); |
| |
| xid = get_xid(); |
| |
| full_path = build_path_from_dentry(direntry); |
| if (full_path == NULL) { |
| rc = -ENOMEM; |
| goto mkdir_out; |
| } |
| |
| if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
| le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
| rc = cifs_posix_mkdir(inode, direntry, mode, full_path, cifs_sb, |
| tcon, xid); |
| if (rc != -EOPNOTSUPP) |
| goto mkdir_out; |
| } |
| |
| server = tcon->ses->server; |
| |
| if (!server->ops->mkdir) { |
| rc = -ENOSYS; |
| goto mkdir_out; |
| } |
| |
| /* BB add setting the equivalent of mode via CreateX w/ACLs */ |
| rc = server->ops->mkdir(xid, tcon, full_path, cifs_sb); |
| if (rc) { |
| cifs_dbg(FYI, "cifs_mkdir returned 0x%x\n", rc); |
| d_drop(direntry); |
| goto mkdir_out; |
| } |
| |
| rc = cifs_mkdir_qinfo(inode, direntry, mode, full_path, cifs_sb, tcon, |
| xid); |
| mkdir_out: |
| /* |
| * Force revalidate to get parent dir info when needed since cached |
| * attributes are invalid now. |
| */ |
| CIFS_I(inode)->time = 0; |
| kfree(full_path); |
| free_xid(xid); |
| cifs_put_tlink(tlink); |
| return rc; |
| } |
| |
| int cifs_rmdir(struct inode *inode, struct dentry *direntry) |
| { |
| int rc = 0; |
| unsigned int xid; |
| struct cifs_sb_info *cifs_sb; |
| struct tcon_link *tlink; |
| struct cifs_tcon *tcon; |
| struct TCP_Server_Info *server; |
| char *full_path = NULL; |
| struct cifsInodeInfo *cifsInode; |
| |
| cifs_dbg(FYI, "cifs_rmdir, inode = 0x%p\n", inode); |
| |
| xid = get_xid(); |
| |
| full_path = build_path_from_dentry(direntry); |
| if (full_path == NULL) { |
| rc = -ENOMEM; |
| goto rmdir_exit; |
| } |
| |
| cifs_sb = CIFS_SB(inode->i_sb); |
| tlink = cifs_sb_tlink(cifs_sb); |
| if (IS_ERR(tlink)) { |
| rc = PTR_ERR(tlink); |
| goto rmdir_exit; |
| } |
| tcon = tlink_tcon(tlink); |
| server = tcon->ses->server; |
| |
| if (!server->ops->rmdir) { |
| rc = -ENOSYS; |
| cifs_put_tlink(tlink); |
| goto rmdir_exit; |
| } |
| |
| rc = server->ops->rmdir(xid, tcon, full_path, cifs_sb); |
| cifs_put_tlink(tlink); |
| |
| if (!rc) { |
| spin_lock(&d_inode(direntry)->i_lock); |
| i_size_write(d_inode(direntry), 0); |
| clear_nlink(d_inode(direntry)); |
| spin_unlock(&d_inode(direntry)->i_lock); |
| } |
| |
| cifsInode = CIFS_I(d_inode(direntry)); |
| /* force revalidate to go get info when needed */ |
| cifsInode->time = 0; |
| |
| cifsInode = CIFS_I(inode); |
| /* |
| * Force revalidate to get parent dir info when needed since cached |
| * attributes are invalid now. |
| */ |
| cifsInode->time = 0; |
| |
| d_inode(direntry)->i_ctime = inode->i_ctime = inode->i_mtime = |
| current_fs_time(inode->i_sb); |
| |
| rmdir_exit: |
| kfree(full_path); |
| free_xid(xid); |
| return rc; |
| } |
| |
| static int |
| cifs_do_rename(const unsigned int xid, struct dentry *from_dentry, |
| const char *from_path, struct dentry *to_dentry, |
| const char *to_path) |
| { |
| struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb); |
| struct tcon_link *tlink; |
| struct cifs_tcon *tcon; |
| struct TCP_Server_Info *server; |
| struct cifs_fid fid; |
| struct cifs_open_parms oparms; |
| int oplock, rc; |
| |
| tlink = cifs_sb_tlink(cifs_sb); |
| if (IS_ERR(tlink)) |
| return PTR_ERR(tlink); |
| tcon = tlink_tcon(tlink); |
| server = tcon->ses->server; |
| |
| if (!server->ops->rename) |
| return -ENOSYS; |
| |
| /* try path-based rename first */ |
| rc = server->ops->rename(xid, tcon, from_path, to_path, cifs_sb); |
| |
| /* |
| * Don't bother with rename by filehandle unless file is busy and |
| * source. Note that cross directory moves do not work with |
| * rename by filehandle to various Windows servers. |
| */ |
| if (rc == 0 || rc != -EBUSY) |
| goto do_rename_exit; |
| |
| /* open-file renames don't work across directories */ |
| if (to_dentry->d_parent != from_dentry->d_parent) |
| goto do_rename_exit; |
| |
| oparms.tcon = tcon; |
| oparms.cifs_sb = cifs_sb; |
| /* open the file to be renamed -- we need DELETE perms */ |
| oparms.desired_access = DELETE; |
| oparms.create_options = CREATE_NOT_DIR; |
| oparms.disposition = FILE_OPEN; |
| oparms.path = from_path; |
| oparms.fid = &fid; |
| oparms.reconnect = false; |
| |
| rc = CIFS_open(xid, &oparms, &oplock, NULL); |
| if (rc == 0) { |
| rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, |
| (const char *) to_dentry->d_name.name, |
| cifs_sb->local_nls, cifs_remap(cifs_sb)); |
| CIFSSMBClose(xid, tcon, fid.netfid); |
| } |
| do_rename_exit: |
| cifs_put_tlink(tlink); |
| return rc; |
| } |
| |
| int |
| cifs_rename2(struct inode *source_dir, struct dentry *source_dentry, |
| struct inode *target_dir, struct dentry *target_dentry, |
| unsigned int flags) |
| { |
| char *from_name = NULL; |
| char *to_name = NULL; |
| struct cifs_sb_info *cifs_sb; |
| struct tcon_link *tlink; |
| struct cifs_tcon *tcon; |
| FILE_UNIX_BASIC_INFO *info_buf_source = NULL; |
| FILE_UNIX_BASIC_INFO *info_buf_target; |
| unsigned int xid; |
| int rc, tmprc; |
| |
| if (flags & ~RENAME_NOREPLACE) |
| return -EINVAL; |
| |
| cifs_sb = CIFS_SB(source_dir->i_sb); |
| tlink = cifs_sb_tlink(cifs_sb); |
| if (IS_ERR(tlink)) |
| return PTR_ERR(tlink); |
| tcon = tlink_tcon(tlink); |
| |
| xid = get_xid(); |
| |
| /* |
| * we already have the rename sem so we do not need to |
| * grab it again here to protect the path integrity |
| */ |
| from_name = build_path_from_dentry(source_dentry); |
| if (from_name == NULL) { |
| rc = -ENOMEM; |
| goto cifs_rename_exit; |
| } |
| |
| to_name = build_path_from_dentry(target_dentry); |
| if (to_name == NULL) { |
| rc = -ENOMEM; |
| goto cifs_rename_exit; |
| } |
| |
| rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry, |
| to_name); |
| |
| /* |
| * No-replace is the natural behavior for CIFS, so skip unlink hacks. |
| */ |
| if (flags & RENAME_NOREPLACE) |
| goto cifs_rename_exit; |
| |
| if (rc == -EEXIST && tcon->unix_ext) { |
| /* |
| * Are src and dst hardlinks of same inode? We can only tell |
| * with unix extensions enabled. |
| */ |
| info_buf_source = |
| kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), |
| GFP_KERNEL); |
| if (info_buf_source == NULL) { |
| rc = -ENOMEM; |
| goto cifs_rename_exit; |
| } |
| |
| info_buf_target = info_buf_source + 1; |
| tmprc = CIFSSMBUnixQPathInfo(xid, tcon, from_name, |
| info_buf_source, |
| cifs_sb->local_nls, |
| cifs_remap(cifs_sb)); |
| if (tmprc != 0) |
| goto unlink_target; |
| |
| tmprc = CIFSSMBUnixQPathInfo(xid, tcon, to_name, |
| info_buf_target, |
| cifs_sb->local_nls, |
| cifs_remap(cifs_sb)); |
| |
| if (tmprc == 0 && (info_buf_source->UniqueId == |
| info_buf_target->UniqueId)) { |
| /* same file, POSIX says that this is a noop */ |
| rc = 0; |
| goto cifs_rename_exit; |
| } |
| } |
| /* |
| * else ... BB we could add the same check for Windows by |
| * checking the UniqueId via FILE_INTERNAL_INFO |
| */ |
| |
| unlink_target: |
| /* Try unlinking the target dentry if it's not negative */ |
| if (d_really_is_positive(target_dentry) && (rc == -EACCES || rc == -EEXIST)) { |
| if (d_is_dir(target_dentry)) |
| tmprc = cifs_rmdir(target_dir, target_dentry); |
| else |
| tmprc = cifs_unlink(target_dir, target_dentry); |
| if (tmprc) |
| goto cifs_rename_exit; |
| rc = cifs_do_rename(xid, source_dentry, from_name, |
| target_dentry, to_name); |
| } |
| |
| /* force revalidate to go get info when needed */ |
| CIFS_I(source_dir)->time = CIFS_I(target_dir)->time = 0; |
| |
| source_dir->i_ctime = source_dir->i_mtime = target_dir->i_ctime = |
| target_dir->i_mtime = current_fs_time(source_dir->i_sb); |
| |
| cifs_rename_exit: |
| kfree(info_buf_source); |
| kfree(from_name); |
| kfree(to_name); |
| free_xid(xid); |
| cifs_put_tlink(tlink); |
| return rc; |
| } |
| |
| static bool |
| cifs_inode_needs_reval(struct inode *inode) |
| { |
| struct cifsInodeInfo *cifs_i = CIFS_I(inode); |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| |
| if (CIFS_CACHE_READ(cifs_i)) |
| return false; |
| |
| if (!lookupCacheEnabled) |
| return true; |
| |
| if (cifs_i->time == 0) |
| return true; |
| |
| if (!cifs_sb->actimeo) |
| return true; |
| |
| if (!time_in_range(jiffies, cifs_i->time, |
| cifs_i->time + cifs_sb->actimeo)) |
| return true; |
| |
| /* hardlinked files w/ noserverino get "special" treatment */ |
| if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) && |
| S_ISREG(inode->i_mode) && inode->i_nlink != 1) |
| return true; |
| |
| return false; |
| } |
| |
| /* |
| * Zap the cache. Called when invalid_mapping flag is set. |
| */ |
| int |
| cifs_invalidate_mapping(struct inode *inode) |
| { |
| int rc = 0; |
| |
| if (inode->i_mapping && inode->i_mapping->nrpages != 0) { |
| rc = invalidate_inode_pages2(inode->i_mapping); |
| if (rc) |
| cifs_dbg(VFS, "%s: could not invalidate inode %p\n", |
| __func__, inode); |
| } |
| |
| cifs_fscache_reset_inode_cookie(inode); |
| return rc; |
| } |
| |
| /** |
| * cifs_wait_bit_killable - helper for functions that are sleeping on bit locks |
| * @word: long word containing the bit lock |
| */ |
| static int |
| cifs_wait_bit_killable(struct wait_bit_key *key, int mode) |
| { |
| freezable_schedule_unsafe(); |
| if (signal_pending_state(mode, current)) |
| return -ERESTARTSYS; |
| return 0; |
| } |
| |
| int |
| cifs_revalidate_mapping(struct inode *inode) |
| { |
| int rc; |
| unsigned long *flags = &CIFS_I(inode)->flags; |
| |
| rc = wait_on_bit_lock_action(flags, CIFS_INO_LOCK, cifs_wait_bit_killable, |
| TASK_KILLABLE); |
| if (rc) |
| return rc; |
| |
| if (test_and_clear_bit(CIFS_INO_INVALID_MAPPING, flags)) { |
| rc = cifs_invalidate_mapping(inode); |
| if (rc) |
| set_bit(CIFS_INO_INVALID_MAPPING, flags); |
| } |
| |
| clear_bit_unlock(CIFS_INO_LOCK, flags); |
| smp_mb__after_atomic(); |
| wake_up_bit(flags, CIFS_INO_LOCK); |
| |
| return rc; |
| } |
| |
| int |
| cifs_zap_mapping(struct inode *inode) |
| { |
| set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(inode)->flags); |
| return cifs_revalidate_mapping(inode); |
| } |
| |
| int cifs_revalidate_file_attr(struct file *filp) |
| { |
| int rc = 0; |
| struct inode *inode = file_inode(filp); |
| struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data; |
| |
| if (!cifs_inode_needs_reval(inode)) |
| return rc; |
| |
| if (tlink_tcon(cfile->tlink)->unix_ext) |
| rc = cifs_get_file_info_unix(filp); |
| else |
| rc = cifs_get_file_info(filp); |
| |
| return rc; |
| } |
| |
| int cifs_revalidate_dentry_attr(struct dentry *dentry) |
| { |
| unsigned int xid; |
| int rc = 0; |
| struct inode *inode = d_inode(dentry); |
| struct super_block *sb = dentry->d_sb; |
| char *full_path = NULL; |
| |
| if (inode == NULL) |
| return -ENOENT; |
| |
| if (!cifs_inode_needs_reval(inode)) |
| return rc; |
| |
| xid = get_xid(); |
| |
| /* can not safely grab the rename sem here if rename calls revalidate |
| since that would deadlock */ |
| full_path = build_path_from_dentry(dentry); |
| if (full_path == NULL) { |
| rc = -ENOMEM; |
| goto out; |
| } |
| |
| cifs_dbg(FYI, "Update attributes: %s inode 0x%p count %d dentry: 0x%p d_time %ld jiffies %ld\n", |
| full_path, inode, inode->i_count.counter, |
| dentry, dentry->d_time, jiffies); |
| |
| if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext) |
| rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid); |
| else |
| rc = cifs_get_inode_info(&inode, full_path, NULL, sb, |
| xid, NULL); |
| |
| out: |
| kfree(full_path); |
| free_xid(xid); |
| return rc; |
| } |
| |
| int cifs_revalidate_file(struct file *filp) |
| { |
| int rc; |
| struct inode *inode = file_inode(filp); |
| |
| rc = cifs_revalidate_file_attr(filp); |
| if (rc) |
| return rc; |
| |
| return cifs_revalidate_mapping(inode); |
| } |
| |
| /* revalidate a dentry's inode attributes */ |
| int cifs_revalidate_dentry(struct dentry *dentry) |
| { |
| int rc; |
| struct inode *inode = d_inode(dentry); |
| |
| rc = cifs_revalidate_dentry_attr(dentry); |
| if (rc) |
| return rc; |
| |
| return cifs_revalidate_mapping(inode); |
| } |
| |
| int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
| struct kstat *stat) |
| { |
| struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb); |
| struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); |
| struct inode *inode = d_inode(dentry); |
| int rc; |
| |
| /* |
| * We need to be sure that all dirty pages are written and the server |
| * has actual ctime, mtime and file length. |
| */ |
| if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping && |
| inode->i_mapping->nrpages != 0) { |
| rc = filemap_fdatawait(inode->i_mapping); |
| if (rc) { |
| mapping_set_error(inode->i_mapping, rc); |
| return rc; |
| } |
| } |
| |
| rc = cifs_revalidate_dentry_attr(dentry); |
| if (rc) |
| return rc; |
| |
| generic_fillattr(inode, stat); |
| stat->blksize = CIFS_MAX_MSGSIZE; |
| stat->ino = CIFS_I(inode)->uniqueid; |
| |
| /* |
| * If on a multiuser mount without unix extensions or cifsacl being |
| * enabled, and the admin hasn't overridden them, set the ownership |
| * to the fsuid/fsgid of the current process. |
| */ |
| if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) && |
| !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) && |
| !tcon->unix_ext) { |
| if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)) |
| stat->uid = current_fsuid(); |
| if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)) |
| stat->gid = current_fsgid(); |
| } |
| return rc; |
| } |
| |
| static int cifs_truncate_page(struct address_space *mapping, loff_t from) |
| { |
| pgoff_t index = from >> PAGE_SHIFT; |
| unsigned offset = from & (PAGE_SIZE - 1); |
| struct page *page; |
| int rc = 0; |
| |
| page = grab_cache_page(mapping, index); |
| if (!page) |
| return -ENOMEM; |
| |
| zero_user_segment(page, offset, PAGE_SIZE); |
| unlock_page(page); |
| put_page(page); |
| return rc; |
| } |
| |
| static void cifs_setsize(struct inode *inode, loff_t offset) |
| { |
| spin_lock(&inode->i_lock); |
| i_size_write(inode, offset); |
| spin_unlock(&inode->i_lock); |
| |
| truncate_pagecache(inode, offset); |
| } |
| |
| static int |
| cifs_set_file_size(struct inode *inode, struct iattr *attrs, |
| unsigned int xid, char *full_path) |
| { |
| int rc; |
| struct cifsFileInfo *open_file; |
| struct cifsInodeInfo *cifsInode = CIFS_I(inode); |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| struct tcon_link *tlink = NULL; |
| struct cifs_tcon *tcon = NULL; |
| struct TCP_Server_Info *server; |
| |
| /* |
| * To avoid spurious oplock breaks from server, in the case of |
| * inodes that we already have open, avoid doing path based |
| * setting of file size if we can do it by handle. |
| * This keeps our caching token (oplock) and avoids timeouts |
| * when the local oplock break takes longer to flush |
| * writebehind data than the SMB timeout for the SetPathInfo |
| * request would allow |
| */ |
| open_file = find_writable_file(cifsInode, true); |
| if (open_file) { |
| tcon = tlink_tcon(open_file->tlink); |
| server = tcon->ses->server; |
| if (server->ops->set_file_size) |
| rc = server->ops->set_file_size(xid, tcon, open_file, |
| attrs->ia_size, false); |
| else |
| rc = -ENOSYS; |
| cifsFileInfo_put(open_file); |
| cifs_dbg(FYI, "SetFSize for attrs rc = %d\n", rc); |
| } else |
| rc = -EINVAL; |
| |
| if (!rc) |
| goto set_size_out; |
| |
| if (tcon == NULL) { |
| tlink = cifs_sb_tlink(cifs_sb); |
| if (IS_ERR(tlink)) |
| return PTR_ERR(tlink); |
| tcon = tlink_tcon(tlink); |
| server = tcon->ses->server; |
| } |
| |
| /* |
| * Set file size by pathname rather than by handle either because no |
| * valid, writeable file handle for it was found or because there was |
| * an error setting it by handle. |
| */ |
| if (server->ops->set_path_size) |
| rc = server->ops->set_path_size(xid, tcon, full_path, |
| attrs->ia_size, cifs_sb, false); |
| else |
| rc = -ENOSYS; |
| cifs_dbg(FYI, "SetEOF by path (setattrs) rc = %d\n", rc); |
| |
| if (tlink) |
| cifs_put_tlink(tlink); |
| |
| set_size_out: |
| if (rc == 0) { |
| cifsInode->server_eof = attrs->ia_size; |
| cifs_setsize(inode, attrs->ia_size); |
| cifs_truncate_page(inode->i_mapping, inode->i_size); |
| } |
| |
| return rc; |
| } |
| |
| static int |
| cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs) |
| { |
| int rc; |
| unsigned int xid; |
| char *full_path = NULL; |
| struct inode *inode = d_inode(direntry); |
| struct cifsInodeInfo *cifsInode = CIFS_I(inode); |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| struct tcon_link *tlink; |
| struct cifs_tcon *pTcon; |
| struct cifs_unix_set_info_args *args = NULL; |
| struct cifsFileInfo *open_file; |
| |
| cifs_dbg(FYI, "setattr_unix on file %pd attrs->ia_valid=0x%x\n", |
| direntry, attrs->ia_valid); |
| |
| xid = get_xid(); |
| |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) |
| attrs->ia_valid |= ATTR_FORCE; |
| |
| rc = inode_change_ok(inode, attrs); |
| if (rc < 0) |
| goto out; |
| |
| full_path = build_path_from_dentry(direntry); |
| if (full_path == NULL) { |
| rc = -ENOMEM; |
| goto out; |
| } |
| |
| /* |
| * Attempt to flush data before changing attributes. We need to do |
| * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the |
| * ownership or mode then we may also need to do this. Here, we take |
| * the safe way out and just do the flush on all setattr requests. If |
| * the flush returns error, store it to report later and continue. |
| * |
| * BB: This should be smarter. Why bother flushing pages that |
| * will be truncated anyway? Also, should we error out here if |
| * the flush returns error? |
| */ |
| rc = filemap_write_and_wait(inode->i_mapping); |
| mapping_set_error(inode->i_mapping, rc); |
| rc = 0; |
| |
| if (attrs->ia_valid & ATTR_SIZE) { |
| rc = cifs_set_file_size(inode, attrs, xid, full_path); |
| if (rc != 0) |
| goto out; |
| } |
| |
| /* skip mode change if it's just for clearing setuid/setgid */ |
| if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID)) |
| attrs->ia_valid &= ~ATTR_MODE; |
| |
| args = kmalloc(sizeof(*args), GFP_KERNEL); |
| if (args == NULL) { |
| rc = -ENOMEM; |
| goto out; |
| } |
| |
| /* set up the struct */ |
| if (attrs->ia_valid & ATTR_MODE) |
| args->mode = attrs->ia_mode; |
| else |
| args->mode = NO_CHANGE_64; |
| |
| if (attrs->ia_valid & ATTR_UID) |
| args->uid = attrs->ia_uid; |
| else |
| args->uid = INVALID_UID; /* no change */ |
| |
| if (attrs->ia_valid & ATTR_GID) |
| args->gid = attrs->ia_gid; |
| else |
| args->gid = INVALID_GID; /* no change */ |
| |
| if (attrs->ia_valid & ATTR_ATIME) |
| args->atime = cifs_UnixTimeToNT(attrs->ia_atime); |
| else |
| args->atime = NO_CHANGE_64; |
| |
| if (attrs->ia_valid & ATTR_MTIME) |
| args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime); |
| else |
| args->mtime = NO_CHANGE_64; |
| |
| if (attrs->ia_valid & ATTR_CTIME) |
| args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime); |
| else |
| args->ctime = NO_CHANGE_64; |
| |
| args->device = 0; |
| open_file = find_writable_file(cifsInode, true); |
| if (open_file) { |
| u16 nfid = open_file->fid.netfid; |
| u32 npid = open_file->pid; |
| pTcon = tlink_tcon(open_file->tlink); |
| rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid); |
| cifsFileInfo_put(open_file); |
| } else { |
| tlink = cifs_sb_tlink(cifs_sb); |
| if (IS_ERR(tlink)) { |
| rc = PTR_ERR(tlink); |
| goto out; |
| } |
| pTcon = tlink_tcon(tlink); |
| rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args, |
| cifs_sb->local_nls, |
| cifs_remap(cifs_sb)); |
| cifs_put_tlink(tlink); |
| } |
| |
| if (rc) |
| goto out; |
| |
| if ((attrs->ia_valid & ATTR_SIZE) && |
| attrs->ia_size != i_size_read(inode)) |
| truncate_setsize(inode, attrs->ia_size); |
| |
| setattr_copy(inode, attrs); |
| mark_inode_dirty(inode); |
| |
| /* force revalidate when any of these times are set since some |
| of the fs types (eg ext3, fat) do not have fine enough |
| time granularity to match protocol, and we do not have a |
| a way (yet) to query the server fs's time granularity (and |
| whether it rounds times down). |
| */ |
| if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME)) |
| cifsInode->time = 0; |
| out: |
| kfree(args); |
| kfree(full_path); |
| free_xid(xid); |
| return rc; |
| } |
| |
| static int |
| cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs) |
| { |
| unsigned int xid; |
| kuid_t uid = INVALID_UID; |
| kgid_t gid = INVALID_GID; |
| struct inode *inode = d_inode(direntry); |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| struct cifsInodeInfo *cifsInode = CIFS_I(inode); |
| char *full_path = NULL; |
| int rc = -EACCES; |
| __u32 dosattr = 0; |
| __u64 mode = NO_CHANGE_64; |
| |
| xid = get_xid(); |
| |
| cifs_dbg(FYI, "setattr on file %pd attrs->iavalid 0x%x\n", |
| direntry, attrs->ia_valid); |
| |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) |
| attrs->ia_valid |= ATTR_FORCE; |
| |
| rc = inode_change_ok(inode, attrs); |
| if (rc < 0) { |
| free_xid(xid); |
| return rc; |
| } |
| |
| full_path = build_path_from_dentry(direntry); |
| if (full_path == NULL) { |
| rc = -ENOMEM; |
| free_xid(xid); |
| return rc; |
| } |
| |
| /* |
| * Attempt to flush data before changing attributes. We need to do |
| * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the |
| * ownership or mode then we may also need to do this. Here, we take |
| * the safe way out and just do the flush on all setattr requests. If |
| * the flush returns error, store it to report later and continue. |
| * |
| * BB: This should be smarter. Why bother flushing pages that |
| * will be truncated anyway? Also, should we error out here if |
| * the flush returns error? |
| */ |
| rc = filemap_write_and_wait(inode->i_mapping); |
| mapping_set_error(inode->i_mapping, rc); |
| rc = 0; |
| |
| if (attrs->ia_valid & ATTR_SIZE) { |
| rc = cifs_set_file_size(inode, attrs, xid, full_path); |
| if (rc != 0) |
| goto cifs_setattr_exit; |
| } |
| |
| if (attrs->ia_valid & ATTR_UID) |
| uid = attrs->ia_uid; |
| |
| if (attrs->ia_valid & ATTR_GID) |
| gid = attrs->ia_gid; |
| |
| #ifdef CONFIG_CIFS_ACL |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) { |
| if (uid_valid(uid) || gid_valid(gid)) { |
| rc = id_mode_to_cifs_acl(inode, full_path, NO_CHANGE_64, |
| uid, gid); |
| if (rc) { |
| cifs_dbg(FYI, "%s: Setting id failed with error: %d\n", |
| __func__, rc); |
| goto cifs_setattr_exit; |
| } |
| } |
| } else |
| #endif /* CONFIG_CIFS_ACL */ |
| if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) |
| attrs->ia_valid &= ~(ATTR_UID | ATTR_GID); |
| |
| /* skip mode change if it's just for clearing setuid/setgid */ |
| if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID)) |
| attrs->ia_valid &= ~ATTR_MODE; |
| |
| if (attrs->ia_valid & ATTR_MODE) { |
| mode = attrs->ia_mode; |
| rc = 0; |
| #ifdef CONFIG_CIFS_ACL |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) { |
| rc = id_mode_to_cifs_acl(inode, full_path, mode, |
| INVALID_UID, INVALID_GID); |
| if (rc) { |
| cifs_dbg(FYI, "%s: Setting ACL failed with error: %d\n", |
| __func__, rc); |
| goto cifs_setattr_exit; |
| } |
| } else |
| #endif /* CONFIG_CIFS_ACL */ |
| if (((mode & S_IWUGO) == 0) && |
| (cifsInode->cifsAttrs & ATTR_READONLY) == 0) { |
| |
| dosattr = cifsInode->cifsAttrs | ATTR_READONLY; |
| |
| /* fix up mode if we're not using dynperm */ |
| if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0) |
| attrs->ia_mode = inode->i_mode & ~S_IWUGO; |
| } else if ((mode & S_IWUGO) && |
| (cifsInode->cifsAttrs & ATTR_READONLY)) { |
| |
| dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY; |
| /* Attributes of 0 are ignored */ |
| if (dosattr == 0) |
| dosattr |= ATTR_NORMAL; |
| |
| /* reset local inode permissions to normal */ |
| if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) { |
| attrs->ia_mode &= ~(S_IALLUGO); |
| if (S_ISDIR(inode->i_mode)) |
| attrs->ia_mode |= |
| cifs_sb->mnt_dir_mode; |
| else |
| attrs->ia_mode |= |
| cifs_sb->mnt_file_mode; |
| } |
| } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) { |
| /* ignore mode change - ATTR_READONLY hasn't changed */ |
| attrs->ia_valid &= ~ATTR_MODE; |
| } |
| } |
| |
| if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) || |
| ((attrs->ia_valid & ATTR_MODE) && dosattr)) { |
| rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr); |
| /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */ |
| |
| /* Even if error on time set, no sense failing the call if |
| the server would set the time to a reasonable value anyway, |
| and this check ensures that we are not being called from |
| sys_utimes in which case we ought to fail the call back to |
| the user when the server rejects the call */ |
| if ((rc) && (attrs->ia_valid & |
| (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE))) |
| rc = 0; |
| } |
| |
| /* do not need local check to inode_check_ok since the server does |
| that */ |
| if (rc) |
| goto cifs_setattr_exit; |
| |
| if ((attrs->ia_valid & ATTR_SIZE) && |
| attrs->ia_size != i_size_read(inode)) |
| truncate_setsize(inode, attrs->ia_size); |
| |
| setattr_copy(inode, attrs); |
| mark_inode_dirty(inode); |
| |
| cifs_setattr_exit: |
| kfree(full_path); |
| free_xid(xid); |
| return rc; |
| } |
| |
| int |
| cifs_setattr(struct dentry *direntry, struct iattr *attrs) |
| { |
| struct inode *inode = d_inode(direntry); |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb); |
| |
| if (pTcon->unix_ext) |
| return cifs_setattr_unix(direntry, attrs); |
| |
| return cifs_setattr_nounix(direntry, attrs); |
| |
| /* BB: add cifs_setattr_legacy for really old servers */ |
| } |
| |
| #if 0 |
| void cifs_delete_inode(struct inode *inode) |
| { |
| cifs_dbg(FYI, "In cifs_delete_inode, inode = 0x%p\n", inode); |
| /* may have to add back in if and when safe distributed caching of |
| directories added e.g. via FindNotify */ |
| } |
| #endif |