diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/jfs/namei.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/jfs/namei.c | 1610 |
1 files changed, 0 insertions, 1610 deletions
diff --git a/ANDROID_3.4.5/fs/jfs/namei.c b/ANDROID_3.4.5/fs/jfs/namei.c deleted file mode 100644 index 07c91ca6..00000000 --- a/ANDROID_3.4.5/fs/jfs/namei.c +++ /dev/null @@ -1,1610 +0,0 @@ -/* - * Copyright (C) International Business Machines Corp., 2000-2004 - * Portions Copyright (C) Christoph Hellwig, 2001-2002 - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program 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 General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; 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/namei.h> -#include <linux/ctype.h> -#include <linux/quotaops.h> -#include <linux/exportfs.h> -#include "jfs_incore.h" -#include "jfs_superblock.h" -#include "jfs_inode.h" -#include "jfs_dinode.h" -#include "jfs_dmap.h" -#include "jfs_unicode.h" -#include "jfs_metapage.h" -#include "jfs_xattr.h" -#include "jfs_acl.h" -#include "jfs_debug.h" - -/* - * forward references - */ -const struct dentry_operations jfs_ci_dentry_operations; - -static s64 commitZeroLink(tid_t, struct inode *); - -/* - * NAME: free_ea_wmap(inode) - * - * FUNCTION: free uncommitted extended attributes from working map - * - */ -static inline void free_ea_wmap(struct inode *inode) -{ - dxd_t *ea = &JFS_IP(inode)->ea; - - if (ea->flag & DXD_EXTENT) { - /* free EA pages from cache */ - invalidate_dxd_metapages(inode, *ea); - dbFree(inode, addressDXD(ea), lengthDXD(ea)); - } - ea->flag = 0; -} - -/* - * NAME: jfs_create(dip, dentry, mode) - * - * FUNCTION: create a regular file in the parent directory <dip> - * with name = <from dentry> and mode = <mode> - * - * PARAMETER: dip - parent directory vnode - * dentry - dentry of new file - * mode - create mode (rwxrwxrwx). - * nd- nd struct - * - * RETURN: Errors from subroutines - * - */ -static int jfs_create(struct inode *dip, struct dentry *dentry, umode_t mode, - struct nameidata *nd) -{ - int rc = 0; - tid_t tid; /* transaction id */ - struct inode *ip = NULL; /* child directory inode */ - ino_t ino; - struct component_name dname; /* child directory name */ - struct btstack btstack; - struct inode *iplist[2]; - struct tblock *tblk; - - jfs_info("jfs_create: dip:0x%p name:%s", dip, dentry->d_name.name); - - dquot_initialize(dip); - - /* - * search parent directory for entry/freespace - * (dtSearch() returns parent directory page pinned) - */ - if ((rc = get_UCSname(&dname, dentry))) - goto out1; - - /* - * Either iAlloc() or txBegin() may block. Deadlock can occur if we - * block there while holding dtree page, so we allocate the inode & - * begin the transaction before we search the directory. - */ - ip = ialloc(dip, mode); - if (IS_ERR(ip)) { - rc = PTR_ERR(ip); - goto out2; - } - - tid = txBegin(dip->i_sb, 0); - - mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); - mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); - - rc = jfs_init_acl(tid, ip, dip); - if (rc) - goto out3; - - rc = jfs_init_security(tid, ip, dip, &dentry->d_name); - if (rc) { - txAbort(tid, 0); - goto out3; - } - - if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) { - jfs_err("jfs_create: dtSearch returned %d", rc); - txAbort(tid, 0); - goto out3; - } - - tblk = tid_to_tblock(tid); - tblk->xflag |= COMMIT_CREATE; - tblk->ino = ip->i_ino; - tblk->u.ixpxd = JFS_IP(ip)->ixpxd; - - iplist[0] = dip; - iplist[1] = ip; - - /* - * initialize the child XAD tree root in-line in inode - */ - xtInitRoot(tid, ip); - - /* - * create entry in parent directory for child directory - * (dtInsert() releases parent directory page) - */ - ino = ip->i_ino; - if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) { - if (rc == -EIO) { - jfs_err("jfs_create: dtInsert returned -EIO"); - txAbort(tid, 1); /* Marks Filesystem dirty */ - } else - txAbort(tid, 0); /* Filesystem full */ - goto out3; - } - - ip->i_op = &jfs_file_inode_operations; - ip->i_fop = &jfs_file_operations; - ip->i_mapping->a_ops = &jfs_aops; - - mark_inode_dirty(ip); - - dip->i_ctime = dip->i_mtime = CURRENT_TIME; - - mark_inode_dirty(dip); - - rc = txCommit(tid, 2, &iplist[0], 0); - - out3: - txEnd(tid); - mutex_unlock(&JFS_IP(ip)->commit_mutex); - mutex_unlock(&JFS_IP(dip)->commit_mutex); - if (rc) { - free_ea_wmap(ip); - clear_nlink(ip); - unlock_new_inode(ip); - iput(ip); - } else { - d_instantiate(dentry, ip); - unlock_new_inode(ip); - } - - out2: - free_UCSname(&dname); - - out1: - - jfs_info("jfs_create: rc:%d", rc); - return rc; -} - - -/* - * NAME: jfs_mkdir(dip, dentry, mode) - * - * FUNCTION: create a child directory in the parent directory <dip> - * with name = <from dentry> and mode = <mode> - * - * PARAMETER: dip - parent directory vnode - * dentry - dentry of child directory - * mode - create mode (rwxrwxrwx). - * - * RETURN: Errors from subroutines - * - * note: - * EACCESS: user needs search+write permission on the parent directory - */ -static int jfs_mkdir(struct inode *dip, struct dentry *dentry, umode_t mode) -{ - int rc = 0; - tid_t tid; /* transaction id */ - struct inode *ip = NULL; /* child directory inode */ - ino_t ino; - struct component_name dname; /* child directory name */ - struct btstack btstack; - struct inode *iplist[2]; - struct tblock *tblk; - - jfs_info("jfs_mkdir: dip:0x%p name:%s", dip, dentry->d_name.name); - - dquot_initialize(dip); - - /* - * search parent directory for entry/freespace - * (dtSearch() returns parent directory page pinned) - */ - if ((rc = get_UCSname(&dname, dentry))) - goto out1; - - /* - * Either iAlloc() or txBegin() may block. Deadlock can occur if we - * block there while holding dtree page, so we allocate the inode & - * begin the transaction before we search the directory. - */ - ip = ialloc(dip, S_IFDIR | mode); - if (IS_ERR(ip)) { - rc = PTR_ERR(ip); - goto out2; - } - - tid = txBegin(dip->i_sb, 0); - - mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); - mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); - - rc = jfs_init_acl(tid, ip, dip); - if (rc) - goto out3; - - rc = jfs_init_security(tid, ip, dip, &dentry->d_name); - if (rc) { - txAbort(tid, 0); - goto out3; - } - - if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) { - jfs_err("jfs_mkdir: dtSearch returned %d", rc); - txAbort(tid, 0); - goto out3; - } - - tblk = tid_to_tblock(tid); - tblk->xflag |= COMMIT_CREATE; - tblk->ino = ip->i_ino; - tblk->u.ixpxd = JFS_IP(ip)->ixpxd; - - iplist[0] = dip; - iplist[1] = ip; - - /* - * initialize the child directory in-line in inode - */ - dtInitRoot(tid, ip, dip->i_ino); - - /* - * create entry in parent directory for child directory - * (dtInsert() releases parent directory page) - */ - ino = ip->i_ino; - if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) { - if (rc == -EIO) { - jfs_err("jfs_mkdir: dtInsert returned -EIO"); - txAbort(tid, 1); /* Marks Filesystem dirty */ - } else - txAbort(tid, 0); /* Filesystem full */ - goto out3; - } - - set_nlink(ip, 2); /* for '.' */ - ip->i_op = &jfs_dir_inode_operations; - ip->i_fop = &jfs_dir_operations; - - mark_inode_dirty(ip); - - /* update parent directory inode */ - inc_nlink(dip); /* for '..' from child directory */ - dip->i_ctime = dip->i_mtime = CURRENT_TIME; - mark_inode_dirty(dip); - - rc = txCommit(tid, 2, &iplist[0], 0); - - out3: - txEnd(tid); - mutex_unlock(&JFS_IP(ip)->commit_mutex); - mutex_unlock(&JFS_IP(dip)->commit_mutex); - if (rc) { - free_ea_wmap(ip); - clear_nlink(ip); - unlock_new_inode(ip); - iput(ip); - } else { - d_instantiate(dentry, ip); - unlock_new_inode(ip); - } - - out2: - free_UCSname(&dname); - - - out1: - - jfs_info("jfs_mkdir: rc:%d", rc); - return rc; -} - -/* - * NAME: jfs_rmdir(dip, dentry) - * - * FUNCTION: remove a link to child directory - * - * PARAMETER: dip - parent inode - * dentry - child directory dentry - * - * RETURN: -EINVAL - if name is . or .. - * -EINVAL - if . or .. exist but are invalid. - * errors from subroutines - * - * note: - * if other threads have the directory open when the last link - * is removed, the "." and ".." entries, if present, are removed before - * rmdir() returns and no new entries may be created in the directory, - * but the directory is not removed until the last reference to - * the directory is released (cf.unlink() of regular file). - */ -static int jfs_rmdir(struct inode *dip, struct dentry *dentry) -{ - int rc; - tid_t tid; /* transaction id */ - struct inode *ip = dentry->d_inode; - ino_t ino; - struct component_name dname; - struct inode *iplist[2]; - struct tblock *tblk; - - jfs_info("jfs_rmdir: dip:0x%p name:%s", dip, dentry->d_name.name); - - /* Init inode for quota operations. */ - dquot_initialize(dip); - dquot_initialize(ip); - - /* directory must be empty to be removed */ - if (!dtEmpty(ip)) { - rc = -ENOTEMPTY; - goto out; - } - - if ((rc = get_UCSname(&dname, dentry))) { - goto out; - } - - tid = txBegin(dip->i_sb, 0); - - mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); - mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); - - iplist[0] = dip; - iplist[1] = ip; - - tblk = tid_to_tblock(tid); - tblk->xflag |= COMMIT_DELETE; - tblk->u.ip = ip; - - /* - * delete the entry of target directory from parent directory - */ - ino = ip->i_ino; - if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) { - jfs_err("jfs_rmdir: dtDelete returned %d", rc); - if (rc == -EIO) - txAbort(tid, 1); - txEnd(tid); - mutex_unlock(&JFS_IP(ip)->commit_mutex); - mutex_unlock(&JFS_IP(dip)->commit_mutex); - - goto out2; - } - - /* update parent directory's link count corresponding - * to ".." entry of the target directory deleted - */ - dip->i_ctime = dip->i_mtime = CURRENT_TIME; - inode_dec_link_count(dip); - - /* - * OS/2 could have created EA and/or ACL - */ - /* free EA from both persistent and working map */ - if (JFS_IP(ip)->ea.flag & DXD_EXTENT) { - /* free EA pages */ - txEA(tid, ip, &JFS_IP(ip)->ea, NULL); - } - JFS_IP(ip)->ea.flag = 0; - - /* free ACL from both persistent and working map */ - if (JFS_IP(ip)->acl.flag & DXD_EXTENT) { - /* free ACL pages */ - txEA(tid, ip, &JFS_IP(ip)->acl, NULL); - } - JFS_IP(ip)->acl.flag = 0; - - /* mark the target directory as deleted */ - clear_nlink(ip); - mark_inode_dirty(ip); - - rc = txCommit(tid, 2, &iplist[0], 0); - - txEnd(tid); - - mutex_unlock(&JFS_IP(ip)->commit_mutex); - mutex_unlock(&JFS_IP(dip)->commit_mutex); - - /* - * Truncating the directory index table is not guaranteed. It - * may need to be done iteratively - */ - if (test_cflag(COMMIT_Stale, dip)) { - if (dip->i_size > 1) - jfs_truncate_nolock(dip, 0); - - clear_cflag(COMMIT_Stale, dip); - } - - out2: - free_UCSname(&dname); - - out: - jfs_info("jfs_rmdir: rc:%d", rc); - return rc; -} - -/* - * NAME: jfs_unlink(dip, dentry) - * - * FUNCTION: remove a link to object <vp> named by <name> - * from parent directory <dvp> - * - * PARAMETER: dip - inode of parent directory - * dentry - dentry of object to be removed - * - * RETURN: errors from subroutines - * - * note: - * temporary file: if one or more processes have the file open - * when the last link is removed, the link will be removed before - * unlink() returns, but the removal of the file contents will be - * postponed until all references to the files are closed. - * - * JFS does NOT support unlink() on directories. - * - */ -static int jfs_unlink(struct inode *dip, struct dentry *dentry) -{ - int rc; - tid_t tid; /* transaction id */ - struct inode *ip = dentry->d_inode; - ino_t ino; - struct component_name dname; /* object name */ - struct inode *iplist[2]; - struct tblock *tblk; - s64 new_size = 0; - int commit_flag; - - jfs_info("jfs_unlink: dip:0x%p name:%s", dip, dentry->d_name.name); - - /* Init inode for quota operations. */ - dquot_initialize(dip); - dquot_initialize(ip); - - if ((rc = get_UCSname(&dname, dentry))) - goto out; - - IWRITE_LOCK(ip, RDWRLOCK_NORMAL); - - tid = txBegin(dip->i_sb, 0); - - mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); - mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); - - iplist[0] = dip; - iplist[1] = ip; - - /* - * delete the entry of target file from parent directory - */ - ino = ip->i_ino; - if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) { - jfs_err("jfs_unlink: dtDelete returned %d", rc); - if (rc == -EIO) - txAbort(tid, 1); /* Marks FS Dirty */ - txEnd(tid); - mutex_unlock(&JFS_IP(ip)->commit_mutex); - mutex_unlock(&JFS_IP(dip)->commit_mutex); - IWRITE_UNLOCK(ip); - goto out1; - } - - ASSERT(ip->i_nlink); - - ip->i_ctime = dip->i_ctime = dip->i_mtime = CURRENT_TIME; - mark_inode_dirty(dip); - - /* update target's inode */ - inode_dec_link_count(ip); - - /* - * commit zero link count object - */ - if (ip->i_nlink == 0) { - assert(!test_cflag(COMMIT_Nolink, ip)); - /* free block resources */ - if ((new_size = commitZeroLink(tid, ip)) < 0) { - txAbort(tid, 1); /* Marks FS Dirty */ - txEnd(tid); - mutex_unlock(&JFS_IP(ip)->commit_mutex); - mutex_unlock(&JFS_IP(dip)->commit_mutex); - IWRITE_UNLOCK(ip); - rc = new_size; - goto out1; - } - tblk = tid_to_tblock(tid); - tblk->xflag |= COMMIT_DELETE; - tblk->u.ip = ip; - } - - /* - * Incomplete truncate of file data can - * result in timing problems unless we synchronously commit the - * transaction. - */ - if (new_size) - commit_flag = COMMIT_SYNC; - else - commit_flag = 0; - - /* - * If xtTruncate was incomplete, commit synchronously to avoid - * timing complications - */ - rc = txCommit(tid, 2, &iplist[0], commit_flag); - - txEnd(tid); - - mutex_unlock(&JFS_IP(ip)->commit_mutex); - mutex_unlock(&JFS_IP(dip)->commit_mutex); - - while (new_size && (rc == 0)) { - tid = txBegin(dip->i_sb, 0); - mutex_lock(&JFS_IP(ip)->commit_mutex); - new_size = xtTruncate_pmap(tid, ip, new_size); - if (new_size < 0) { - txAbort(tid, 1); /* Marks FS Dirty */ - rc = new_size; - } else - rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC); - txEnd(tid); - mutex_unlock(&JFS_IP(ip)->commit_mutex); - } - - if (ip->i_nlink == 0) - set_cflag(COMMIT_Nolink, ip); - - IWRITE_UNLOCK(ip); - - /* - * Truncating the directory index table is not guaranteed. It - * may need to be done iteratively - */ - if (test_cflag(COMMIT_Stale, dip)) { - if (dip->i_size > 1) - jfs_truncate_nolock(dip, 0); - - clear_cflag(COMMIT_Stale, dip); - } - - out1: - free_UCSname(&dname); - out: - jfs_info("jfs_unlink: rc:%d", rc); - return rc; -} - -/* - * NAME: commitZeroLink() - * - * FUNCTION: for non-directory, called by jfs_remove(), - * truncate a regular file, directory or symbolic - * link to zero length. return 0 if type is not - * one of these. - * - * if the file is currently associated with a VM segment - * only permanent disk and inode map resources are freed, - * and neither the inode nor indirect blocks are modified - * so that the resources can be later freed in the work - * map by ctrunc1. - * if there is no VM segment on entry, the resources are - * freed in both work and permanent map. - * (? for temporary file - memory object is cached even - * after no reference: - * reference count > 0 - ) - * - * PARAMETERS: cd - pointer to commit data structure. - * current inode is the one to truncate. - * - * RETURN: Errors from subroutines - */ -static s64 commitZeroLink(tid_t tid, struct inode *ip) -{ - int filetype; - struct tblock *tblk; - - jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip); - - filetype = ip->i_mode & S_IFMT; - switch (filetype) { - case S_IFREG: - break; - case S_IFLNK: - /* fast symbolic link */ - if (ip->i_size < IDATASIZE) { - ip->i_size = 0; - return 0; - } - break; - default: - assert(filetype != S_IFDIR); - return 0; - } - - set_cflag(COMMIT_Freewmap, ip); - - /* mark transaction of block map update type */ - tblk = tid_to_tblock(tid); - tblk->xflag |= COMMIT_PMAP; - - /* - * free EA - */ - if (JFS_IP(ip)->ea.flag & DXD_EXTENT) - /* acquire maplock on EA to be freed from block map */ - txEA(tid, ip, &JFS_IP(ip)->ea, NULL); - - /* - * free ACL - */ - if (JFS_IP(ip)->acl.flag & DXD_EXTENT) - /* acquire maplock on EA to be freed from block map */ - txEA(tid, ip, &JFS_IP(ip)->acl, NULL); - - /* - * free xtree/data (truncate to zero length): - * free xtree/data pages from cache if COMMIT_PWMAP, - * free xtree/data blocks from persistent block map, and - * free xtree/data blocks from working block map if COMMIT_PWMAP; - */ - if (ip->i_size) - return xtTruncate_pmap(tid, ip, 0); - - return 0; -} - - -/* - * NAME: jfs_free_zero_link() - * - * FUNCTION: for non-directory, called by iClose(), - * free resources of a file from cache and WORKING map - * for a file previously committed with zero link count - * while associated with a pager object, - * - * PARAMETER: ip - pointer to inode of file. - */ -void jfs_free_zero_link(struct inode *ip) -{ - int type; - - jfs_info("jfs_free_zero_link: ip = 0x%p", ip); - - /* return if not reg or symbolic link or if size is - * already ok. - */ - type = ip->i_mode & S_IFMT; - - switch (type) { - case S_IFREG: - break; - case S_IFLNK: - /* if its contained in inode nothing to do */ - if (ip->i_size < IDATASIZE) - return; - break; - default: - return; - } - - /* - * free EA - */ - if (JFS_IP(ip)->ea.flag & DXD_EXTENT) { - s64 xaddr = addressDXD(&JFS_IP(ip)->ea); - int xlen = lengthDXD(&JFS_IP(ip)->ea); - struct maplock maplock; /* maplock for COMMIT_WMAP */ - struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */ - - /* free EA pages from cache */ - invalidate_dxd_metapages(ip, JFS_IP(ip)->ea); - - /* free EA extent from working block map */ - maplock.index = 1; - pxdlock = (struct pxd_lock *) & maplock; - pxdlock->flag = mlckFREEPXD; - PXDaddress(&pxdlock->pxd, xaddr); - PXDlength(&pxdlock->pxd, xlen); - txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP); - } - - /* - * free ACL - */ - if (JFS_IP(ip)->acl.flag & DXD_EXTENT) { - s64 xaddr = addressDXD(&JFS_IP(ip)->acl); - int xlen = lengthDXD(&JFS_IP(ip)->acl); - struct maplock maplock; /* maplock for COMMIT_WMAP */ - struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */ - - invalidate_dxd_metapages(ip, JFS_IP(ip)->acl); - - /* free ACL extent from working block map */ - maplock.index = 1; - pxdlock = (struct pxd_lock *) & maplock; - pxdlock->flag = mlckFREEPXD; - PXDaddress(&pxdlock->pxd, xaddr); - PXDlength(&pxdlock->pxd, xlen); - txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP); - } - - /* - * free xtree/data (truncate to zero length): - * free xtree/data pages from cache, and - * free xtree/data blocks from working block map; - */ - if (ip->i_size) - xtTruncate(0, ip, 0, COMMIT_WMAP); -} - -/* - * NAME: jfs_link(vp, dvp, name, crp) - * - * FUNCTION: create a link to <vp> by the name = <name> - * in the parent directory <dvp> - * - * PARAMETER: vp - target object - * dvp - parent directory of new link - * name - name of new link to target object - * crp - credential - * - * RETURN: Errors from subroutines - * - * note: - * JFS does NOT support link() on directories (to prevent circular - * path in the directory hierarchy); - * EPERM: the target object is a directory, and either the caller - * does not have appropriate privileges or the implementation prohibits - * using link() on directories [XPG4.2]. - * - * JFS does NOT support links between file systems: - * EXDEV: target object and new link are on different file systems and - * implementation does not support links between file systems [XPG4.2]. - */ -static int jfs_link(struct dentry *old_dentry, - struct inode *dir, struct dentry *dentry) -{ - int rc; - tid_t tid; - struct inode *ip = old_dentry->d_inode; - ino_t ino; - struct component_name dname; - struct btstack btstack; - struct inode *iplist[2]; - - jfs_info("jfs_link: %s %s", old_dentry->d_name.name, - dentry->d_name.name); - - dquot_initialize(dir); - - tid = txBegin(ip->i_sb, 0); - - mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT); - mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); - - /* - * scan parent directory for entry/freespace - */ - if ((rc = get_UCSname(&dname, dentry))) - goto out; - - if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) - goto free_dname; - - /* - * create entry for new link in parent directory - */ - ino = ip->i_ino; - if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) - goto free_dname; - - /* update object inode */ - inc_nlink(ip); /* for new link */ - ip->i_ctime = CURRENT_TIME; - dir->i_ctime = dir->i_mtime = CURRENT_TIME; - mark_inode_dirty(dir); - ihold(ip); - - iplist[0] = ip; - iplist[1] = dir; - rc = txCommit(tid, 2, &iplist[0], 0); - - if (rc) { - drop_nlink(ip); /* never instantiated */ - iput(ip); - } else - d_instantiate(dentry, ip); - - free_dname: - free_UCSname(&dname); - - out: - txEnd(tid); - - mutex_unlock(&JFS_IP(ip)->commit_mutex); - mutex_unlock(&JFS_IP(dir)->commit_mutex); - - jfs_info("jfs_link: rc:%d", rc); - return rc; -} - -/* - * NAME: jfs_symlink(dip, dentry, name) - * - * FUNCTION: creates a symbolic link to <symlink> by name <name> - * in directory <dip> - * - * PARAMETER: dip - parent directory vnode - * dentry - dentry of symbolic link - * name - the path name of the existing object - * that will be the source of the link - * - * RETURN: errors from subroutines - * - * note: - * ENAMETOOLONG: pathname resolution of a symbolic link produced - * an intermediate result whose length exceeds PATH_MAX [XPG4.2] -*/ - -static int jfs_symlink(struct inode *dip, struct dentry *dentry, - const char *name) -{ - int rc; - tid_t tid; - ino_t ino = 0; - struct component_name dname; - int ssize; /* source pathname size */ - struct btstack btstack; - struct inode *ip = dentry->d_inode; - unchar *i_fastsymlink; - s64 xlen = 0; - int bmask = 0, xsize; - s64 xaddr; - struct metapage *mp; - struct super_block *sb; - struct tblock *tblk; - - struct inode *iplist[2]; - - jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name); - - dquot_initialize(dip); - - ssize = strlen(name) + 1; - - /* - * search parent directory for entry/freespace - * (dtSearch() returns parent directory page pinned) - */ - - if ((rc = get_UCSname(&dname, dentry))) - goto out1; - - /* - * allocate on-disk/in-memory inode for symbolic link: - * (iAlloc() returns new, locked inode) - */ - ip = ialloc(dip, S_IFLNK | 0777); - if (IS_ERR(ip)) { - rc = PTR_ERR(ip); - goto out2; - } - - tid = txBegin(dip->i_sb, 0); - - mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); - mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); - - rc = jfs_init_security(tid, ip, dip, &dentry->d_name); - if (rc) - goto out3; - - tblk = tid_to_tblock(tid); - tblk->xflag |= COMMIT_CREATE; - tblk->ino = ip->i_ino; - tblk->u.ixpxd = JFS_IP(ip)->ixpxd; - - /* fix symlink access permission - * (dir_create() ANDs in the u.u_cmask, - * but symlinks really need to be 777 access) - */ - ip->i_mode |= 0777; - - /* - * write symbolic link target path name - */ - xtInitRoot(tid, ip); - - /* - * write source path name inline in on-disk inode (fast symbolic link) - */ - - if (ssize <= IDATASIZE) { - ip->i_op = &jfs_fast_symlink_inode_operations; - - i_fastsymlink = JFS_IP(ip)->i_inline; - memcpy(i_fastsymlink, name, ssize); - ip->i_size = ssize - 1; - - /* - * if symlink is > 128 bytes, we don't have the space to - * store inline extended attributes - */ - if (ssize > sizeof (JFS_IP(ip)->i_inline)) - JFS_IP(ip)->mode2 &= ~INLINEEA; - - jfs_info("jfs_symlink: fast symlink added ssize:%d name:%s ", - ssize, name); - } - /* - * write source path name in a single extent - */ - else { - jfs_info("jfs_symlink: allocate extent ip:0x%p", ip); - - ip->i_op = &jfs_symlink_inode_operations; - ip->i_mapping->a_ops = &jfs_aops; - - /* - * even though the data of symlink object (source - * path name) is treated as non-journaled user data, - * it is read/written thru buffer cache for performance. - */ - sb = ip->i_sb; - bmask = JFS_SBI(sb)->bsize - 1; - xsize = (ssize + bmask) & ~bmask; - xaddr = 0; - xlen = xsize >> JFS_SBI(sb)->l2bsize; - if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) { - txAbort(tid, 0); - goto out3; - } - ip->i_size = ssize - 1; - while (ssize) { - /* This is kind of silly since PATH_MAX == 4K */ - int copy_size = min(ssize, PSIZE); - - mp = get_metapage(ip, xaddr, PSIZE, 1); - - if (mp == NULL) { - xtTruncate(tid, ip, 0, COMMIT_PWMAP); - rc = -EIO; - txAbort(tid, 0); - goto out3; - } - memcpy(mp->data, name, copy_size); - flush_metapage(mp); - ssize -= copy_size; - name += copy_size; - xaddr += JFS_SBI(sb)->nbperpage; - } - } - - /* - * create entry for symbolic link in parent directory - */ - rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE); - if (rc == 0) { - ino = ip->i_ino; - rc = dtInsert(tid, dip, &dname, &ino, &btstack); - } - if (rc) { - if (xlen) - xtTruncate(tid, ip, 0, COMMIT_PWMAP); - txAbort(tid, 0); - /* discard new inode */ - goto out3; - } - - mark_inode_dirty(ip); - - dip->i_ctime = dip->i_mtime = CURRENT_TIME; - mark_inode_dirty(dip); - /* - * commit update of parent directory and link object - */ - - iplist[0] = dip; - iplist[1] = ip; - rc = txCommit(tid, 2, &iplist[0], 0); - - out3: - txEnd(tid); - mutex_unlock(&JFS_IP(ip)->commit_mutex); - mutex_unlock(&JFS_IP(dip)->commit_mutex); - if (rc) { - free_ea_wmap(ip); - clear_nlink(ip); - unlock_new_inode(ip); - iput(ip); - } else { - d_instantiate(dentry, ip); - unlock_new_inode(ip); - } - - out2: - free_UCSname(&dname); - - out1: - jfs_info("jfs_symlink: rc:%d", rc); - return rc; -} - - -/* - * NAME: jfs_rename - * - * FUNCTION: rename a file or directory - */ -static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry, - struct inode *new_dir, struct dentry *new_dentry) -{ - struct btstack btstack; - ino_t ino; - struct component_name new_dname; - struct inode *new_ip; - struct component_name old_dname; - struct inode *old_ip; - int rc; - tid_t tid; - struct tlock *tlck; - struct dt_lock *dtlck; - struct lv *lv; - int ipcount; - struct inode *iplist[4]; - struct tblock *tblk; - s64 new_size = 0; - int commit_flag; - - - jfs_info("jfs_rename: %s %s", old_dentry->d_name.name, - new_dentry->d_name.name); - - dquot_initialize(old_dir); - dquot_initialize(new_dir); - - old_ip = old_dentry->d_inode; - new_ip = new_dentry->d_inode; - - if ((rc = get_UCSname(&old_dname, old_dentry))) - goto out1; - - if ((rc = get_UCSname(&new_dname, new_dentry))) - goto out2; - - /* - * Make sure source inode number is what we think it is - */ - rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP); - if (rc || (ino != old_ip->i_ino)) { - rc = -ENOENT; - goto out3; - } - - /* - * Make sure dest inode number (if any) is what we think it is - */ - rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP); - if (!rc) { - if ((!new_ip) || (ino != new_ip->i_ino)) { - rc = -ESTALE; - goto out3; - } - } else if (rc != -ENOENT) - goto out3; - else if (new_ip) { - /* no entry exists, but one was expected */ - rc = -ESTALE; - goto out3; - } - - if (S_ISDIR(old_ip->i_mode)) { - if (new_ip) { - if (!dtEmpty(new_ip)) { - rc = -ENOTEMPTY; - goto out3; - } - } - } else if (new_ip) { - IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL); - /* Init inode for quota operations. */ - dquot_initialize(new_ip); - } - - /* - * The real work starts here - */ - tid = txBegin(new_dir->i_sb, 0); - - /* - * How do we know the locking is safe from deadlocks? - * The vfs does the hard part for us. Any time we are taking nested - * commit_mutexes, the vfs already has i_mutex held on the parent. - * Here, the vfs has already taken i_mutex on both old_dir and new_dir. - */ - mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT); - mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD); - if (old_dir != new_dir) - mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex, - COMMIT_MUTEX_SECOND_PARENT); - - if (new_ip) { - mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex, - COMMIT_MUTEX_VICTIM); - /* - * Change existing directory entry to new inode number - */ - ino = new_ip->i_ino; - rc = dtModify(tid, new_dir, &new_dname, &ino, - old_ip->i_ino, JFS_RENAME); - if (rc) - goto out4; - drop_nlink(new_ip); - if (S_ISDIR(new_ip->i_mode)) { - drop_nlink(new_ip); - if (new_ip->i_nlink) { - mutex_unlock(&JFS_IP(new_ip)->commit_mutex); - if (old_dir != new_dir) - mutex_unlock(&JFS_IP(old_dir)->commit_mutex); - mutex_unlock(&JFS_IP(old_ip)->commit_mutex); - mutex_unlock(&JFS_IP(new_dir)->commit_mutex); - if (!S_ISDIR(old_ip->i_mode) && new_ip) - IWRITE_UNLOCK(new_ip); - jfs_error(new_ip->i_sb, - "jfs_rename: new_ip->i_nlink != 0"); - return -EIO; - } - tblk = tid_to_tblock(tid); - tblk->xflag |= COMMIT_DELETE; - tblk->u.ip = new_ip; - } else if (new_ip->i_nlink == 0) { - assert(!test_cflag(COMMIT_Nolink, new_ip)); - /* free block resources */ - if ((new_size = commitZeroLink(tid, new_ip)) < 0) { - txAbort(tid, 1); /* Marks FS Dirty */ - rc = new_size; - goto out4; - } - tblk = tid_to_tblock(tid); - tblk->xflag |= COMMIT_DELETE; - tblk->u.ip = new_ip; - } else { - new_ip->i_ctime = CURRENT_TIME; - mark_inode_dirty(new_ip); - } - } else { - /* - * Add new directory entry - */ - rc = dtSearch(new_dir, &new_dname, &ino, &btstack, - JFS_CREATE); - if (rc) { - jfs_err("jfs_rename didn't expect dtSearch to fail " - "w/rc = %d", rc); - goto out4; - } - - ino = old_ip->i_ino; - rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack); - if (rc) { - if (rc == -EIO) - jfs_err("jfs_rename: dtInsert returned -EIO"); - goto out4; - } - if (S_ISDIR(old_ip->i_mode)) - inc_nlink(new_dir); - } - /* - * Remove old directory entry - */ - - ino = old_ip->i_ino; - rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE); - if (rc) { - jfs_err("jfs_rename did not expect dtDelete to return rc = %d", - rc); - txAbort(tid, 1); /* Marks Filesystem dirty */ - goto out4; - } - if (S_ISDIR(old_ip->i_mode)) { - drop_nlink(old_dir); - if (old_dir != new_dir) { - /* - * Change inode number of parent for moved directory - */ - - JFS_IP(old_ip)->i_dtroot.header.idotdot = - cpu_to_le32(new_dir->i_ino); - - /* Linelock header of dtree */ - tlck = txLock(tid, old_ip, - (struct metapage *) &JFS_IP(old_ip)->bxflag, - tlckDTREE | tlckBTROOT | tlckRELINK); - dtlck = (struct dt_lock *) & tlck->lock; - ASSERT(dtlck->index == 0); - lv = & dtlck->lv[0]; - lv->offset = 0; - lv->length = 1; - dtlck->index++; - } - } - - /* - * Update ctime on changed/moved inodes & mark dirty - */ - old_ip->i_ctime = CURRENT_TIME; - mark_inode_dirty(old_ip); - - new_dir->i_ctime = new_dir->i_mtime = current_fs_time(new_dir->i_sb); - mark_inode_dirty(new_dir); - - /* Build list of inodes modified by this transaction */ - ipcount = 0; - iplist[ipcount++] = old_ip; - if (new_ip) - iplist[ipcount++] = new_ip; - iplist[ipcount++] = old_dir; - - if (old_dir != new_dir) { - iplist[ipcount++] = new_dir; - old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME; - mark_inode_dirty(old_dir); - } - - /* - * Incomplete truncate of file data can - * result in timing problems unless we synchronously commit the - * transaction. - */ - if (new_size) - commit_flag = COMMIT_SYNC; - else - commit_flag = 0; - - rc = txCommit(tid, ipcount, iplist, commit_flag); - - out4: - txEnd(tid); - if (new_ip) - mutex_unlock(&JFS_IP(new_ip)->commit_mutex); - if (old_dir != new_dir) - mutex_unlock(&JFS_IP(old_dir)->commit_mutex); - mutex_unlock(&JFS_IP(old_ip)->commit_mutex); - mutex_unlock(&JFS_IP(new_dir)->commit_mutex); - - while (new_size && (rc == 0)) { - tid = txBegin(new_ip->i_sb, 0); - mutex_lock(&JFS_IP(new_ip)->commit_mutex); - new_size = xtTruncate_pmap(tid, new_ip, new_size); - if (new_size < 0) { - txAbort(tid, 1); - rc = new_size; - } else - rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC); - txEnd(tid); - mutex_unlock(&JFS_IP(new_ip)->commit_mutex); - } - if (new_ip && (new_ip->i_nlink == 0)) - set_cflag(COMMIT_Nolink, new_ip); - out3: - free_UCSname(&new_dname); - out2: - free_UCSname(&old_dname); - out1: - if (new_ip && !S_ISDIR(new_ip->i_mode)) - IWRITE_UNLOCK(new_ip); - /* - * Truncating the directory index table is not guaranteed. It - * may need to be done iteratively - */ - if (test_cflag(COMMIT_Stale, old_dir)) { - if (old_dir->i_size > 1) - jfs_truncate_nolock(old_dir, 0); - - clear_cflag(COMMIT_Stale, old_dir); - } - - jfs_info("jfs_rename: returning %d", rc); - return rc; -} - - -/* - * NAME: jfs_mknod - * - * FUNCTION: Create a special file (device) - */ -static int jfs_mknod(struct inode *dir, struct dentry *dentry, - umode_t mode, dev_t rdev) -{ - struct jfs_inode_info *jfs_ip; - struct btstack btstack; - struct component_name dname; - ino_t ino; - struct inode *ip; - struct inode *iplist[2]; - int rc; - tid_t tid; - struct tblock *tblk; - - if (!new_valid_dev(rdev)) - return -EINVAL; - - jfs_info("jfs_mknod: %s", dentry->d_name.name); - - dquot_initialize(dir); - - if ((rc = get_UCSname(&dname, dentry))) - goto out; - - ip = ialloc(dir, mode); - if (IS_ERR(ip)) { - rc = PTR_ERR(ip); - goto out1; - } - jfs_ip = JFS_IP(ip); - - tid = txBegin(dir->i_sb, 0); - - mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT); - mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); - - rc = jfs_init_acl(tid, ip, dir); - if (rc) - goto out3; - - rc = jfs_init_security(tid, ip, dir, &dentry->d_name); - if (rc) { - txAbort(tid, 0); - goto out3; - } - - if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) { - txAbort(tid, 0); - goto out3; - } - - tblk = tid_to_tblock(tid); - tblk->xflag |= COMMIT_CREATE; - tblk->ino = ip->i_ino; - tblk->u.ixpxd = JFS_IP(ip)->ixpxd; - - ino = ip->i_ino; - if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) { - txAbort(tid, 0); - goto out3; - } - - ip->i_op = &jfs_file_inode_operations; - jfs_ip->dev = new_encode_dev(rdev); - init_special_inode(ip, ip->i_mode, rdev); - - mark_inode_dirty(ip); - - dir->i_ctime = dir->i_mtime = CURRENT_TIME; - - mark_inode_dirty(dir); - - iplist[0] = dir; - iplist[1] = ip; - rc = txCommit(tid, 2, iplist, 0); - - out3: - txEnd(tid); - mutex_unlock(&JFS_IP(ip)->commit_mutex); - mutex_unlock(&JFS_IP(dir)->commit_mutex); - if (rc) { - free_ea_wmap(ip); - clear_nlink(ip); - unlock_new_inode(ip); - iput(ip); - } else { - d_instantiate(dentry, ip); - unlock_new_inode(ip); - } - - out1: - free_UCSname(&dname); - - out: - jfs_info("jfs_mknod: returning %d", rc); - return rc; -} - -static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, struct nameidata *nd) -{ - struct btstack btstack; - ino_t inum; - struct inode *ip; - struct component_name key; - int rc; - - jfs_info("jfs_lookup: name = %s", dentry->d_name.name); - - if ((rc = get_UCSname(&key, dentry))) - return ERR_PTR(rc); - rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP); - free_UCSname(&key); - if (rc == -ENOENT) { - ip = NULL; - } else if (rc) { - jfs_err("jfs_lookup: dtSearch returned %d", rc); - ip = ERR_PTR(rc); - } else { - ip = jfs_iget(dip->i_sb, inum); - if (IS_ERR(ip)) - jfs_err("jfs_lookup: iget failed on inum %d", (uint)inum); - } - - return d_splice_alias(ip, dentry); -} - -static struct inode *jfs_nfs_get_inode(struct super_block *sb, - u64 ino, u32 generation) -{ - struct inode *inode; - - if (ino == 0) - return ERR_PTR(-ESTALE); - inode = jfs_iget(sb, ino); - if (IS_ERR(inode)) - return ERR_CAST(inode); - - if (generation && inode->i_generation != generation) { - iput(inode); - return ERR_PTR(-ESTALE); - } - - return inode; -} - -struct dentry *jfs_fh_to_dentry(struct super_block *sb, struct fid *fid, - int fh_len, int fh_type) -{ - return generic_fh_to_dentry(sb, fid, fh_len, fh_type, - jfs_nfs_get_inode); -} - -struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid, - int fh_len, int fh_type) -{ - return generic_fh_to_parent(sb, fid, fh_len, fh_type, - jfs_nfs_get_inode); -} - -struct dentry *jfs_get_parent(struct dentry *dentry) -{ - unsigned long parent_ino; - - parent_ino = - le32_to_cpu(JFS_IP(dentry->d_inode)->i_dtroot.header.idotdot); - - return d_obtain_alias(jfs_iget(dentry->d_inode->i_sb, parent_ino)); -} - -const struct inode_operations jfs_dir_inode_operations = { - .create = jfs_create, - .lookup = jfs_lookup, - .link = jfs_link, - .unlink = jfs_unlink, - .symlink = jfs_symlink, - .mkdir = jfs_mkdir, - .rmdir = jfs_rmdir, - .mknod = jfs_mknod, - .rename = jfs_rename, - .setxattr = jfs_setxattr, - .getxattr = jfs_getxattr, - .listxattr = jfs_listxattr, - .removexattr = jfs_removexattr, - .setattr = jfs_setattr, -#ifdef CONFIG_JFS_POSIX_ACL - .get_acl = jfs_get_acl, -#endif -}; - -const struct file_operations jfs_dir_operations = { - .read = generic_read_dir, - .readdir = jfs_readdir, - .fsync = jfs_fsync, - .unlocked_ioctl = jfs_ioctl, -#ifdef CONFIG_COMPAT - .compat_ioctl = jfs_compat_ioctl, -#endif - .llseek = generic_file_llseek, -}; - -static int jfs_ci_hash(const struct dentry *dir, const struct inode *inode, - struct qstr *this) -{ - unsigned long hash; - int i; - - hash = init_name_hash(); - for (i=0; i < this->len; i++) - hash = partial_name_hash(tolower(this->name[i]), hash); - this->hash = end_name_hash(hash); - - return 0; -} - -static int jfs_ci_compare(const struct dentry *parent, - const struct inode *pinode, - const struct dentry *dentry, const struct inode *inode, - unsigned int len, const char *str, const struct qstr *name) -{ - int i, result = 1; - - if (len != name->len) - goto out; - for (i=0; i < len; i++) { - if (tolower(str[i]) != tolower(name->name[i])) - goto out; - } - result = 0; -out: - return result; -} - -static int jfs_ci_revalidate(struct dentry *dentry, struct nameidata *nd) -{ - /* - * This is not negative dentry. Always valid. - * - * Note, rename() to existing directory entry will have ->d_inode, - * and will use existing name which isn't specified name by user. - * - * We may be able to drop this positive dentry here. But dropping - * positive dentry isn't good idea. So it's unsupported like - * rename("filename", "FILENAME") for now. - */ - if (dentry->d_inode) - return 1; - - /* - * This may be nfsd (or something), anyway, we can't see the - * intent of this. So, since this can be for creation, drop it. - */ - if (!nd) - return 0; - - /* - * Drop the negative dentry, in order to make sure to use the - * case sensitive name which is specified by user if this is - * for creation. - */ - if (nd->flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) - return 0; - return 1; -} - -const struct dentry_operations jfs_ci_dentry_operations = -{ - .d_hash = jfs_ci_hash, - .d_compare = jfs_ci_compare, - .d_revalidate = jfs_ci_revalidate, -}; |