diff options
Diffstat (limited to 'fs/cifs/inode.c')
| -rw-r--r-- | fs/cifs/inode.c | 1096 |
1 files changed, 1096 insertions, 0 deletions
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c new file mode 100644 index 000000000000..d73b0aa86775 --- /dev/null +++ b/fs/cifs/inode.c @@ -0,0 +1,1096 @@ +/* + * fs/cifs/inode.c + * + * Copyright (C) International Business Machines Corp., 2002,2005 + * 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/buffer_head.h> +#include <linux/stat.h> +#include <linux/pagemap.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" + +int cifs_get_inode_info_unix(struct inode **pinode, + const unsigned char *search_path, struct super_block *sb, int xid) +{ + int rc = 0; + FILE_UNIX_BASIC_INFO findData; + struct cifsTconInfo *pTcon; + struct inode *inode; + struct cifs_sb_info *cifs_sb = CIFS_SB(sb); + char *tmp_path; + + pTcon = cifs_sb->tcon; + cFYI(1, (" Getting info on %s ", search_path)); + /* could have done a find first instead but this returns more info */ + rc = CIFSSMBUnixQPathInfo(xid, pTcon, search_path, &findData, + cifs_sb->local_nls); +/* dump_mem("\nUnixQPathInfo return data", &findData, + sizeof(findData)); */ + if (rc) { + if (rc == -EREMOTE) { + tmp_path = + kmalloc(strnlen(pTcon->treeName, + MAX_TREE_SIZE + 1) + + strnlen(search_path, MAX_PATHCONF) + 1, + GFP_KERNEL); + if (tmp_path == NULL) { + return -ENOMEM; + } + /* have to skip first of the double backslash of + UNC name */ + strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE); + strncat(tmp_path, search_path, MAX_PATHCONF); + rc = connect_to_dfs_path(xid, pTcon->ses, + /* treename + */ tmp_path, + cifs_sb->local_nls); + kfree(tmp_path); + + /* BB fix up inode etc. */ + } else if (rc) { + return rc; + } + } else { + struct cifsInodeInfo *cifsInfo; + __u32 type = le32_to_cpu(findData.Type); + __u64 num_of_bytes = le64_to_cpu(findData.NumOfBytes); + __u64 end_of_file = le64_to_cpu(findData.EndOfFile); + + /* get new inode */ + if (*pinode == NULL) { + *pinode = new_inode(sb); + if(*pinode == NULL) + return -ENOMEM; + /* Is an i_ino of zero legal? */ + /* Are there sanity checks we can use to ensure that + the server is really filling in that field? */ + if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { + (*pinode)->i_ino = + (unsigned long)findData.UniqueId; + } /* note ino incremented to unique num in new_inode */ + insert_inode_hash(*pinode); + } + + inode = *pinode; + cifsInfo = CIFS_I(inode); + + cFYI(1, (" Old time %ld ", cifsInfo->time)); + cifsInfo->time = jiffies; + cFYI(1, (" New time %ld ", cifsInfo->time)); + /* this is ok to set on every inode revalidate */ + atomic_set(&cifsInfo->inUse,1); + + inode->i_atime = + cifs_NTtimeToUnix(le64_to_cpu(findData.LastAccessTime)); + inode->i_mtime = + cifs_NTtimeToUnix(le64_to_cpu + (findData.LastModificationTime)); + inode->i_ctime = + cifs_NTtimeToUnix(le64_to_cpu(findData.LastStatusChange)); + inode->i_mode = le64_to_cpu(findData.Permissions); + if (type == UNIX_FILE) { + inode->i_mode |= S_IFREG; + } else if (type == UNIX_SYMLINK) { + inode->i_mode |= S_IFLNK; + } else if (type == UNIX_DIR) { + inode->i_mode |= S_IFDIR; + } else if (type == UNIX_CHARDEV) { + inode->i_mode |= S_IFCHR; + inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor), + le64_to_cpu(findData.DevMinor) & MINORMASK); + } else if (type == UNIX_BLOCKDEV) { + inode->i_mode |= S_IFBLK; + inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor), + le64_to_cpu(findData.DevMinor) & MINORMASK); + } else if (type == UNIX_FIFO) { + inode->i_mode |= S_IFIFO; + } else if (type == UNIX_SOCKET) { + inode->i_mode |= S_IFSOCK; + } + inode->i_uid = le64_to_cpu(findData.Uid); + inode->i_gid = le64_to_cpu(findData.Gid); + inode->i_nlink = le64_to_cpu(findData.Nlinks); + + if(is_size_safe_to_change(cifsInfo)) { + /* can not safely change the file size here if the + client is writing to it due to potential races */ + + i_size_write(inode, end_of_file); + + /* blksize needs to be multiple of two. So safer to default to + blksize and blkbits set in superblock so 2**blkbits and blksize + will match rather than setting to: + (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/ + + /* This seems incredibly stupid but it turns out that i_blocks + is not related to (i_size / i_blksize), instead 512 byte size + is required for calculating num blocks */ + + /* 512 bytes (2**9) is the fake blocksize that must be used */ + /* for this calculation */ + inode->i_blocks = (512 - 1 + num_of_bytes) >> 9; + } + + if (num_of_bytes < end_of_file) + cFYI(1, ("allocation size less than end of file ")); + cFYI(1, + ("Size %ld and blocks %ld", + (unsigned long) inode->i_size, inode->i_blocks)); + if (S_ISREG(inode->i_mode)) { + cFYI(1, (" File inode ")); + inode->i_op = &cifs_file_inode_ops; + if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) + inode->i_fop = &cifs_file_direct_ops; + else + inode->i_fop = &cifs_file_ops; + inode->i_data.a_ops = &cifs_addr_ops; + } else if (S_ISDIR(inode->i_mode)) { + cFYI(1, (" Directory inode")); + inode->i_op = &cifs_dir_inode_ops; + inode->i_fop = &cifs_dir_ops; + } else if (S_ISLNK(inode->i_mode)) { + cFYI(1, (" Symbolic Link inode ")); + inode->i_op = &cifs_symlink_inode_ops; + /* tmp_inode->i_fop = */ /* do not need to set to anything */ + } else { + cFYI(1, (" Init special inode ")); + init_special_inode(inode, inode->i_mode, + inode->i_rdev); + } + } + return rc; +} + +int cifs_get_inode_info(struct inode **pinode, + const unsigned char *search_path, FILE_ALL_INFO *pfindData, + struct super_block *sb, int xid) +{ + int rc = 0; + struct cifsTconInfo *pTcon; + struct inode *inode; + struct cifs_sb_info *cifs_sb = CIFS_SB(sb); + char *tmp_path; + char *buf = NULL; + + pTcon = cifs_sb->tcon; + cFYI(1,("Getting info on %s ", search_path)); + + if((pfindData == NULL) && (*pinode != NULL)) { + if(CIFS_I(*pinode)->clientCanCacheRead) { + cFYI(1,("No need to revalidate cached inode sizes")); + return rc; + } + } + + /* if file info not passed in then get it from server */ + if(pfindData == NULL) { + buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); + if(buf == NULL) + return -ENOMEM; + pfindData = (FILE_ALL_INFO *)buf; + /* could do find first instead but this returns more info */ + rc = CIFSSMBQPathInfo(xid, pTcon, search_path, pfindData, + cifs_sb->local_nls); + } + /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */ + if (rc) { + if (rc == -EREMOTE) { + tmp_path = + kmalloc(strnlen + (pTcon->treeName, + MAX_TREE_SIZE + 1) + + strnlen(search_path, MAX_PATHCONF) + 1, + GFP_KERNEL); + if (tmp_path == NULL) { + kfree(buf); + return -ENOMEM; + } + + strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE); + strncat(tmp_path, search_path, MAX_PATHCONF); + rc = connect_to_dfs_path(xid, pTcon->ses, + /* treename + */ tmp_path, + cifs_sb->local_nls); + kfree(tmp_path); + /* BB fix up inode etc. */ + } else if (rc) { + kfree(buf); + return rc; + } + } else { + struct cifsInodeInfo *cifsInfo; + __u32 attr = le32_to_cpu(pfindData->Attributes); + + /* get new inode */ + if (*pinode == NULL) { + *pinode = new_inode(sb); + if (*pinode == NULL) + return -ENOMEM; + /* 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? */ + + /* We can not use the IndexNumber field by default from + Windows or Samba (in ALL_INFO buf) but we can request + it explicitly. It may not be unique presumably if + the server has multiple devices mounted under one + share */ + + /* There may be higher info levels that work but are + there Windows server or network appliances for which + IndexNumber field is not guaranteed unique? */ + +#ifdef CONFIG_CIFS_EXPERIMENTAL + if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM){ + int rc1 = 0; + __u64 inode_num; + + rc1 = CIFSGetSrvInodeNumber(xid, pTcon, + search_path, &inode_num, + cifs_sb->local_nls); + if(rc1) { + cFYI(1,("GetSrvInodeNum rc %d", rc1)); + /* BB EOPNOSUPP disable SERVER_INUM? */ + } else /* do we need cast or hash to ino? */ + (*pinode)->i_ino = inode_num; + } /* else ino incremented to unique num in new_inode*/ +#endif /* CIFS_EXPERIMENTAL */ + insert_inode_hash(*pinode); + } + inode = *pinode; + cifsInfo = CIFS_I(inode); + cifsInfo->cifsAttrs = attr; + cFYI(1, (" Old time %ld ", cifsInfo->time)); + cifsInfo->time = jiffies; + cFYI(1, (" New time %ld ", cifsInfo->time)); + + /* blksize needs to be multiple of two. So safer to default to + blksize and blkbits set in superblock so 2**blkbits and blksize + will match rather than setting to: + (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/ + + /* Linux can not store file creation time unfortunately so we ignore it */ + inode->i_atime = + cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime)); + inode->i_mtime = + cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime)); + inode->i_ctime = + cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime)); + cFYI(0, (" Attributes came in as 0x%x ", attr)); + + /* set default mode. will override for dirs below */ + if (atomic_read(&cifsInfo->inUse) == 0) + /* new inode, can safely set these fields */ + inode->i_mode = cifs_sb->mnt_file_mode; + +/* if (attr & ATTR_REPARSE) */ + /* We no longer handle these as symlinks because we could not + follow them due to the absolute path with drive letter */ + if (attr & ATTR_DIRECTORY) { + /* override default perms since we do not do byte range locking + on dirs */ + inode->i_mode = cifs_sb->mnt_dir_mode; + inode->i_mode |= S_IFDIR; + } else { + inode->i_mode |= S_IFREG; + /* treat the dos attribute of read-only as read-only + mode e.g. 555 */ + if (cifsInfo->cifsAttrs & ATTR_READONLY) + inode->i_mode &= ~(S_IWUGO); + /* BB add code here - + validate if device or weird share or device type? */ + } + if (is_size_safe_to_change(cifsInfo)) { + /* can not safely change the file size here if the + client is writing to it due to potential races */ + i_size_write(inode,le64_to_cpu(pfindData->EndOfFile)); + + /* 512 bytes (2**9) is the fake blocksize that must be + used for this calculation */ + inode->i_blocks = (512 - 1 + le64_to_cpu( + pfindData->AllocationSize)) >> 9; + } + + inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks); + + /* BB fill in uid and gid here? with help from winbind? + or retrieve from NTFS stream extended attribute */ + if (atomic_read(&cifsInfo->inUse) == 0) { + inode->i_uid = cifs_sb->mnt_uid; + inode->i_gid = cifs_sb->mnt_gid; + /* set so we do not keep refreshing these fields with + bad data after user has changed them in memory */ + atomic_set(&cifsInfo->inUse,1); + } + + if (S_ISREG(inode->i_mode)) { + cFYI(1, (" File inode ")); + inode->i_op = &cifs_file_inode_ops; + if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) + inode->i_fop = &cifs_file_direct_ops; + else + inode->i_fop = &cifs_file_ops; + inode->i_data.a_ops = &cifs_addr_ops; + } else if (S_ISDIR(inode->i_mode)) { + cFYI(1, (" Directory inode ")); + inode->i_op = &cifs_dir_inode_ops; + inode->i_fop = &cifs_dir_ops; + } else if (S_ISLNK(inode->i_mode)) { + cFYI(1, (" Symbolic Link inode ")); + inode->i_op = &cifs_symlink_inode_ops; + } else { + init_special_inode(inode, inode->i_mode, + inode->i_rdev); + } + } + kfree(buf); + return rc; +} + +/* gets root inode */ +void cifs_read_inode(struct inode *inode) +{ + int xid; + struct cifs_sb_info *cifs_sb; + + cifs_sb = CIFS_SB(inode->i_sb); + xid = GetXid(); + if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) + cifs_get_inode_info_unix(&inode, "", inode->i_sb,xid); + else + cifs_get_inode_info(&inode, "", NULL, inode->i_sb,xid); + /* can not call macro FreeXid here since in a void func */ + _FreeXid(xid); +} + +int cifs_unlink(struct inode *inode, struct dentry *direntry) +{ + int rc = 0; + int xid; + struct cifs_sb_info *cifs_sb; + struct cifsTconInfo *pTcon; + char *full_path = NULL; + struct cifsInodeInfo *cifsInode; + FILE_BASIC_INFO *pinfo_buf; + + cFYI(1, (" cifs_unlink, inode = 0x%p with ", inode)); + + xid = GetXid(); + + cifs_sb = CIFS_SB(inode->i_sb); + pTcon = cifs_sb->tcon; + + /* Unlink can be called from rename so we can not grab the sem here + since we deadlock otherwise */ +/* down(&direntry->d_sb->s_vfs_rename_sem);*/ + full_path = build_path_from_dentry(direntry); +/* up(&direntry->d_sb->s_vfs_rename_sem);*/ + if (full_path == NULL) { + FreeXid(xid); + return -ENOMEM; + } + rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls); + + if (!rc) { + direntry->d_inode->i_nlink--; + } else if (rc == -ENOENT) { + d_drop(direntry); + } else if (rc == -ETXTBSY) { + int oplock = FALSE; + __u16 netfid; + + rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE, + CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE, + &netfid, &oplock, NULL, cifs_sb->local_nls); + if (rc==0) { + CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL, + cifs_sb->local_nls); + CIFSSMBClose(xid, pTcon, netfid); + direntry->d_inode->i_nlink--; + } + } else if (rc == -EACCES) { + /* try only if r/o attribute set in local lookup data? */ + pinfo_buf = kmalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL); + if (pinfo_buf) { + memset(pinfo_buf, 0, sizeof(FILE_BASIC_INFO)); + /* ATTRS set to normal clears r/o bit */ + pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL); + if (!(pTcon->ses->flags & CIFS_SES_NT4)) + rc = CIFSSMBSetTimes(xid, pTcon, full_path, + pinfo_buf, + cifs_sb->local_nls); + else + rc = -EOPNOTSUPP; + + if (rc == -EOPNOTSUPP) { + int oplock = FALSE; + __u16 netfid; + /* rc = CIFSSMBSetAttrLegacy(xid, pTcon, + full_path, + (__u16)ATTR_NORMAL, + cifs_sb->local_nls); + For some strange reason it seems that NT4 eats the + old setattr call without actually setting the + attributes so on to the third attempted workaround + */ + + /* BB could scan to see if we already have it open + and pass in pid of opener to function */ + rc = CIFSSMBOpen(xid, pTcon, full_path, + FILE_OPEN, SYNCHRONIZE | + FILE_WRITE_ATTRIBUTES, 0, + &netfid, &oplock, NULL, + cifs_sb->local_nls); + if (rc==0) { + rc = CIFSSMBSetFileTimes(xid, pTcon, + pinfo_buf, + netfid); + CIFSSMBClose(xid, pTcon, netfid); + } + } + kfree(pinfo_buf); + } + if (rc==0) { + rc = CIFSSMBDelFile(xid, pTcon, full_path, + cifs_sb->local_nls); + if (!rc) { + direntry->d_inode->i_nlink--; + } else if (rc == -ETXTBSY) { + int oplock = FALSE; + __u16 netfid; + + rc = CIFSSMBOpen(xid, pTcon, full_path, + FILE_OPEN, DELETE, + CREATE_NOT_DIR | + CREATE_DELETE_ON_CLOSE, + &netfid, &oplock, NULL, + cifs_sb->local_nls); + if (rc==0) { + CIFSSMBRenameOpenFile(xid, pTcon, + netfid, NULL, + cifs_sb->local_nls); + CIFSSMBClose(xid, pTcon, netfid); + direntry->d_inode->i_nlink--; + } + /* BB if rc = -ETXTBUSY goto the rename logic BB */ + } + } + } + cifsInode = CIFS_I(direntry->d_inode); + cifsInode->time = 0; /* will force revalidate to get info when + needed */ + direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime = + current_fs_time(inode->i_sb); + cifsInode = CIFS_I(inode); + cifsInode->time = 0; /* force revalidate of dir as well */ + + kfree(full_path); + FreeXid(xid); + return rc; +} + +int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode) +{ + int rc = 0; + int xid; + struct cifs_sb_info *cifs_sb; + struct cifsTconInfo *pTcon; + char *full_path = NULL; + struct inode *newinode = NULL; + + cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p ", mode, inode)); + + xid = GetXid(); + + cifs_sb = CIFS_SB(inode->i_sb); + pTcon = cifs_sb->tcon; + + down(&inode->i_sb->s_vfs_rename_sem); + full_path = build_path_from_dentry(direntry); + up(&inode->i_sb->s_vfs_rename_sem); + if (full_path == NULL) { + FreeXid(xid); + return -ENOMEM; + } + /* BB add setting the equivalent of mode via CreateX w/ACLs */ + rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls); + if (rc) { + cFYI(1, ("cifs_mkdir returned 0x%x ", rc)); + d_drop(direntry); + } else { + inode->i_nlink++; + if (pTcon->ses->capabilities & CAP_UNIX) + rc = cifs_get_inode_info_unix(&newinode, full_path, + inode->i_sb,xid); + else + rc = cifs_get_inode_info(&newinode, full_path, NULL, + inode->i_sb,xid); + + direntry->d_op = &cifs_dentry_ops; + d_instantiate(direntry, newinode); + if (direntry->d_inode) + direntry->d_inode->i_nlink = 2; + if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) + if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) { + CIFSSMBUnixSetPerms(xid, pTcon, full_path, + mode, + (__u64)current->euid, + (__u64)current->egid, + 0 /* dev_t */, + cifs_sb->local_nls); + } else { + CIFSSMBUnixSetPerms(xid, pTcon, full_path, + mode, (__u64)-1, + (__u64)-1, 0 /* dev_t */, + cifs_sb->local_nls); + } + else { + /* BB to be implemented via Windows secrty descriptors + eg CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, + -1, -1, local_nls); */ + } + } + kfree(full_path); + FreeXid(xid); + return rc; +} + +int cifs_rmdir(struct inode *inode, struct dentry *direntry) +{ + int rc = 0; + int xid; + struct cifs_sb_info *cifs_sb; + struct cifsTconInfo *pTcon; + char *full_path = NULL; + struct cifsInodeInfo *cifsInode; + + cFYI(1, (" cifs_rmdir, inode = 0x%p with ", inode)); + + xid = GetXid(); + + cifs_sb = CIFS_SB(inode->i_sb); + pTcon = cifs_sb->tcon; + + down(&inode->i_sb->s_vfs_rename_sem); + full_path = build_path_from_dentry(direntry); + up(&inode->i_sb->s_vfs_rename_sem); + if (full_path == NULL) { + FreeXid(xid); + return -ENOMEM; + } + + rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls); + + if (!rc) { + inode->i_nlink--; + i_size_write(direntry->d_inode,0); + direntry->d_inode->i_nlink = 0; + } + + cifsInode = CIFS_I(direntry->d_inode); + cifsInode->time = 0; /* force revalidate to go get info when + needed */ + direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime = + current_fs_time(inode->i_sb); + + kfree(full_path); + FreeXid(xid); + return rc; +} + +int cifs_rename(struct inode *source_inode, struct dentry *source_direntry, + struct inode *target_inode, struct dentry *target_direntry) +{ + char *fromName; + char *toName; + struct cifs_sb_info *cifs_sb_source; + struct cifs_sb_info *cifs_sb_target; + struct cifsTconInfo *pTcon; + int xid; + int rc = 0; + + xid = GetXid(); + + cifs_sb_target = CIFS_SB(target_inode->i_sb); + cifs_sb_source = CIFS_SB(source_inode->i_sb); + pTcon = cifs_sb_source->tcon; + + if (pTcon != cifs_sb_target->tcon) { + FreeXid(xid); + return -EXDEV; /* BB actually could be allowed if same server, + but different share. + Might eventually add support for this */ + } + + /* we already have the rename sem so we do not need to grab it again + here to protect the path integrity */ + fromName = build_path_from_dentry(source_direntry); + toName = build_path_from_dentry(target_direntry); + if ((fromName == NULL) || (toName == NULL)) { + rc = -ENOMEM; + goto cifs_rename_exit; + } + + rc = CIFSSMBRename(xid, pTcon, fromName, toName, + cifs_sb_source->local_nls); + if (rc == -EEXIST) { + /* check if they are the same file because rename of hardlinked + files is a noop */ + FILE_UNIX_BASIC_INFO *info_buf_source; + FILE_UNIX_BASIC_INFO *info_buf_target; + + info_buf_source = + kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); + if (info_buf_source != NULL) { + info_buf_target = info_buf_source + 1; + rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName, + info_buf_source, cifs_sb_source->local_nls); + if (rc == 0) { + rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName, + info_buf_target, + cifs_sb_target->local_nls); + } + if ((rc == 0) && + (info_buf_source->UniqueId == + info_buf_target->UniqueId)) { + /* do not rename since the files are hardlinked which + is a noop */ + } else { + /* we either can not tell the files are hardlinked + (as with Windows servers) or files are not + hardlinked so delete the target manually before + renaming to follow POSIX rather than Windows + semantics */ + cifs_unlink(target_inode, target_direntry); + rc = CIFSSMBRename(xid, pTcon, fromName, + toName, + cifs_sb_source->local_nls); + } + kfree(info_buf_source); + } /* if we can not get memory just leave rc as EEXIST */ + } + + if (rc) { + cFYI(1, ("rename rc %d", rc)); + } + + if ((rc == -EIO) || (rc == -EEXIST)) { + int oplock = FALSE; + __u16 netfid; + + /* BB FIXME Is Generic Read correct for rename? */ + /* if renaming directory - we should not say CREATE_NOT_DIR, + need to test renaming open directory, also GENERIC_READ + might not right be right access to request */ + rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ, + CREATE_NOT_DIR, &netfid, &oplock, NULL, + cifs_sb_source->local_nls); + if (rc==0) { + CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName, + cifs_sb_source->local_nls); + CIFSSMBClose(xid, pTcon, netfid); + } + } + +cifs_rename_exit: + kfree(fromName); + kfree(toName); + FreeXid(xid); + return rc; +} + +int cifs_revalidate(struct dentry *direntry) +{ + int xid; + int rc = 0; + char *full_path; + struct cifs_sb_info *cifs_sb; + struct cifsInodeInfo *cifsInode; + loff_t local_size; + struct timespec local_mtime; + int invalidate_inode = FALSE; + + if (direntry->d_inode == NULL) + return -ENOENT; + + cifsInode = CIFS_I(direntry->d_inode); + + if (cifsInode == NULL) + return -ENOENT; + + /* no sense revalidating inode info on file that no one can write */ + if (CIFS_I(direntry->d_inode)->clientCanCacheRead) + return rc; + + xid = GetXid(); + + cifs_sb = CIFS_SB(direntry->d_sb); + + /* can not safely grab the rename sem here if rename calls revalidate + since that would deadlock */ + full_path = build_path_from_dentry(direntry); + if (full_path == NULL) { + FreeXid(xid); + return -ENOMEM; + } + cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld " + "jiffies %ld", full_path, direntry->d_inode, + direntry->d_inode->i_count.counter, direntry, + direntry->d_time, jiffies)); + + if (cifsInode->time == 0) { + /* was set to zero previously to force revalidate */ + } else if (time_before(jiffies, cifsInode->time + HZ) && + lookupCacheEnabled) { + if ((S_ISREG(direntry->d_inode->i_mode) == 0) || + (direntry->d_inode->i_nlink == 1)) { + kfree(full_path); + FreeXid(xid); + return rc; + } else { + cFYI(1, ("Have to revalidate file due to hardlinks")); + } + } + + /* save mtime and size */ + local_mtime = direntry->d_inode->i_mtime; + local_size = direntry->d_inode->i_size; + + if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) { + rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path, + direntry->d_sb,xid); + if (rc) { + cFYI(1, ("error on getting revalidate info %d", rc)); +/* if (rc != -ENOENT) + rc = 0; */ /* BB should we cache info on + certain errors? */ + } + } else { + rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL, + direntry->d_sb,xid); + if (rc) { + cFYI(1, ("error on getting revalidate info %d", rc)); +/* if (rc != -ENOENT) + rc = 0; */ /* BB should we cache info on + certain errors? */ + } + } + /* should we remap certain errors, access denied?, to zero */ + + /* if not oplocked, we invalidate inode pages if mtime or file size + had changed on server */ + + if (timespec_equal(&local_mtime,&direntry->d_inode->i_mtime) && + (local_size == direntry->d_inode->i_size)) { + cFYI(1, ("cifs_revalidate - inode unchanged")); + } else { + /* file may have changed on server */ + if (cifsInode->clientCanCacheRead) { + /* no need to invalidate inode pages since we were the + only ones who could have modified the file and the + server copy is staler than ours */ + } else { + invalidate_inode = TRUE; + } + } + + /* can not grab this sem since kernel filesys locking documentation + indicates i_sem may be taken by the kernel on lookup and rename + which could deadlock if we grab the i_sem here as well */ +/* down(&direntry->d_inode->i_sem);*/ + /* need to write out dirty pages here */ + if (direntry->d_inode->i_mapping) { + /* do we need to lock inode until after invalidate completes + below? */ + filemap_fdatawrite(direntry->d_inode->i_mapping); + } + if (invalidate_inode) { + if (direntry->d_inode->i_mapping) + filemap_fdatawait(direntry->d_inode->i_mapping); + /* may eventually have to do this for open files too */ + if (list_empty(&(cifsInode->openFileList))) { + /* Has changed on server - flush read ahead pages */ + cFYI(1, ("Invalidating read ahead data on " + "closed file")); + invalidate_remote_inode(direntry->d_inode); + } + } +/* up(&direntry->d_inode->i_sem); */ + + kfree(full_path); + FreeXid(xid); + return rc; +} + +int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry, + struct kstat *stat) +{ + int err = cifs_revalidate(dentry); + if (!err) + generic_fillattr(dentry->d_inode, stat); + return err; +} + +static int cifs_truncate_page(struct address_space *mapping, loff_t from) +{ + pgoff_t index = from >> PAGE_CACHE_SHIFT; + unsigned offset = from & (PAGE_CACHE_SIZE - 1); + struct page *page; + char *kaddr; + int rc = 0; + + page = grab_cache_page(mapping, index); + if (!page) + return -ENOMEM; + + kaddr = kmap_atomic(page, KM_USER0); + memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); + flush_dcache_page(page); + kunmap_atomic(kaddr, KM_USER0); + unlock_page(page); + page_cache_release(page); + return rc; +} + +int cifs_setattr(struct dentry *direntry, struct iattr *attrs) +{ + int xid; + struct cifs_sb_info *cifs_sb; + struct cifsTconInfo *pTcon; + char *full_path = NULL; + int rc = -EACCES; + int found = FALSE; + struct cifsFileInfo *open_file = NULL; + FILE_BASIC_INFO time_buf; + int set_time = FALSE; + __u64 mode = 0xFFFFFFFFFFFFFFFFULL; + __u64 uid = 0xFFFFFFFFFFFFFFFFULL; + __u64 gid = 0xFFFFFFFFFFFFFFFFULL; + struct cifsInodeInfo *cifsInode; + struct list_head *tmp; + + xid = GetXid(); + + cFYI(1, (" In cifs_setattr, name = %s attrs->iavalid 0x%x ", + direntry->d_name.name, attrs->ia_valid)); + cifs_sb = CIFS_SB(direntry->d_inode->i_sb); + pTcon = cifs_sb->tcon; + + down(&direntry->d_sb->s_vfs_rename_sem); + full_path = build_path_from_dentry(direntry); + up(&direntry->d_sb->s_vfs_rename_sem); + if (full_path == NULL) { + FreeXid(xid); + return -ENOMEM; + } + cifsInode = CIFS_I(direntry->d_inode); + + /* BB check if we need to refresh inode from server now ? BB */ + + /* need to flush data before changing file size on server */ + filemap_fdatawrite(direntry->d_inode->i_mapping); + filemap_fdatawait(direntry->d_inode->i_mapping); + + if (attrs->ia_valid & ATTR_SIZE) { + read_lock(&GlobalSMBSeslock); + /* 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 */ + list_for_each(tmp, &cifsInode->openFileList) { + open_file = list_entry(tmp, struct cifsFileInfo, + flist); + /* We check if file is open for writing first */ + if ((open_file->pfile) && + ((open_file->pfile->f_flags & O_RDWR) || + (open_file->pfile->f_flags & O_WRONLY))) { + if (open_file->invalidHandle == FALSE) { + /* we found a valid, writeable network + file handle to use to try to set the + file size */ + __u16 nfid = open_file->netfid; + __u32 npid = open_file->pid; + read_unlock(&GlobalSMBSeslock); + found = TRUE; + rc = CIFSSMBSetFileSize(xid, pTcon, + attrs->ia_size, nfid, npid, + FALSE); + cFYI(1, ("SetFileSize by handle " + "(setattrs) rc = %d", rc)); + /* Do not need reopen and retry on + EAGAIN since we will retry by + pathname below */ + + /* now that we found one valid file + handle no sense continuing to loop + trying others, so break here */ + break; + } + } + } + if (found == FALSE) + read_unlock(&GlobalSMBSeslock); + + if (rc != 0) { + /* 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 */ + rc = CIFSSMBSetEOF(xid, pTcon, full_path, + attrs->ia_size, FALSE, + cifs_sb->local_nls); + cFYI(1, (" SetEOF by path (setattrs) rc = %d", rc)); + } + + /* Server is ok setting allocation size implicitly - no need + to call: + CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, TRUE, + cifs_sb->local_nls); + */ + + if (rc == 0) { + rc = vmtruncate(direntry->d_inode, attrs->ia_size); + cifs_truncate_page(direntry->d_inode->i_mapping, + direntry->d_inode->i_size); + } + } + if (attrs->ia_valid & ATTR_UID) { + cFYI(1, (" CIFS - UID changed to %d", attrs->ia_uid)); + uid = attrs->ia_uid; + /* entry->uid = cpu_to_le16(attr->ia_uid); */ + } + if (attrs->ia_valid & ATTR_GID) { + cFYI(1, (" CIFS - GID changed to %d", attrs->ia_gid)); + gid = attrs->ia_gid; + /* entry->gid = cpu_to_le16(attr->ia_gid); */ + } + + time_buf.Attributes = 0; + if (attrs->ia_valid & ATTR_MODE) { + cFYI(1, (" CIFS - Mode changed to 0x%x", attrs->ia_mode)); + mode = attrs->ia_mode; + /* entry->mode = cpu_to_le16(attr->ia_mode); */ + } + + if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX) + && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID))) + rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid, + 0 /* dev_t */, cifs_sb->local_nls); + else if (attrs->ia_valid & ATTR_MODE) { + if ((mode & S_IWUGO) == 0) /* not writeable */ { + if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0) + time_buf.Attributes = + cpu_to_le32(cifsInode->cifsAttrs | + ATTR_READONLY); + } else if ((mode & S_IWUGO) == S_IWUGO) { + if (cifsInode->cifsAttrs & ATTR_READONLY) + time_buf.Attributes = + cpu_to_le32(cifsInode->cifsAttrs & + (~ATTR_READONLY)); + } + /* BB to be implemented - + via Windows security descriptors or streams */ + /* CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, uid, gid, + cifs_sb->local_nls); */ + } + + if (attrs->ia_valid & ATTR_ATIME) { + set_time = TRUE; + time_buf.LastAccessTime = + cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime)); + } else + time_buf.LastAccessTime = 0; + + if (attrs->ia_valid & ATTR_MTIME) { + set_time = TRUE; + time_buf.LastWriteTime = + cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime)); + } else + time_buf.LastWriteTime = 0; + + if (attrs->ia_valid & ATTR_CTIME) { + set_time = TRUE; + cFYI(1, (" CIFS - CTIME changed ")); /* BB probably no need */ + time_buf.ChangeTime = + cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime)); + } else + time_buf.ChangeTime = 0; + + if (set_time || time_buf.Attributes) { + /* BB what if setting one attribute fails (such as size) but + time setting works? */ + time_buf.CreationTime = 0; /* do not change */ + /* In the future we should experiment - try setting timestamps + via Handle (SetFileInfo) instead of by path */ + if (!(pTcon->ses->flags & CIFS_SES_NT4)) + rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf, + cifs_sb->local_nls); + else + rc = -EOPNOTSUPP; + + if (rc == -EOPNOTSUPP) { + int oplock = FALSE; + __u16 netfid; + + cFYI(1, ("calling SetFileInfo since SetPathInfo for " + "times not supported by this server")); + /* BB we could scan to see if we already have it open + and pass in pid of opener to function */ + rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, + SYNCHRONIZE | FILE_WRITE_ATTRIBUTES, + CREATE_NOT_DIR, &netfid, &oplock, + NULL, cifs_sb->local_nls); + if (rc==0) { + rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf, + netfid); + CIFSSMBClose(xid, pTcon, netfid); + } else { + /* BB For even older servers we could convert time_buf + into old DOS style which uses two second + granularity */ + + /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path, + &time_buf, cifs_sb->local_nls); */ + } + } + } + + /* do not need local check to inode_check_ok since the server does + that */ + if (!rc) + rc = inode_setattr(direntry->d_inode, attrs); + kfree(full_path); + FreeXid(xid); + return rc; +} + +void cifs_delete_inode(struct inode *inode) +{ + cFYI(1, ("In cifs_delete_inode, inode = 0x%p ", inode)); + /* may have to add back in if and when safe distributed caching of + directories added e.g. via FindNotify */ +} |