| /* |
| * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
| * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. |
| * |
| * This copyrighted material is made available to anyone wishing to use, |
| * modify, copy, or redistribute it subject to the terms and conditions |
| * of the GNU General Public License v.2. |
| */ |
| |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/completion.h> |
| #include <linux/buffer_head.h> |
| #include <linux/namei.h> |
| #include <linux/utsname.h> |
| #include <linux/mm.h> |
| #include <linux/xattr.h> |
| #include <linux/posix_acl.h> |
| #include <asm/semaphore.h> |
| #include <asm/uaccess.h> |
| |
| #include "gfs2.h" |
| #include "acl.h" |
| #include "bmap.h" |
| #include "dir.h" |
| #include "eaops.h" |
| #include "eattr.h" |
| #include "glock.h" |
| #include "inode.h" |
| #include "meta_io.h" |
| #include "ops_dentry.h" |
| #include "ops_inode.h" |
| #include "page.h" |
| #include "quota.h" |
| #include "rgrp.h" |
| #include "trans.h" |
| #include "unlinked.h" |
| |
| /** |
| * gfs2_create - Create a file |
| * @dir: The directory in which to create the file |
| * @dentry: The dentry of the new file |
| * @mode: The mode of the new file |
| * |
| * Returns: errno |
| */ |
| |
| static int gfs2_create(struct inode *dir, struct dentry *dentry, |
| int mode, struct nameidata *nd) |
| { |
| struct gfs2_inode *dip = get_v2ip(dir); |
| struct gfs2_sbd *sdp = dip->i_sbd; |
| struct gfs2_holder ghs[2]; |
| struct inode *inode; |
| int new = 1; |
| int error; |
| |
| atomic_inc(&sdp->sd_ops_inode); |
| |
| gfs2_holder_init(dip->i_gl, 0, 0, ghs); |
| |
| for (;;) { |
| inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode); |
| if (!IS_ERR(inode)) { |
| gfs2_trans_end(sdp); |
| if (dip->i_alloc.al_rgd) |
| gfs2_inplace_release(dip); |
| gfs2_quota_unlock(dip); |
| gfs2_alloc_put(dip); |
| gfs2_glock_dq_uninit_m(2, ghs); |
| break; |
| } else if (PTR_ERR(inode) != -EEXIST || |
| (nd->intent.open.flags & O_EXCL)) { |
| gfs2_holder_uninit(ghs); |
| return PTR_ERR(inode); |
| } |
| |
| error = gfs2_lookupi(dir, &dentry->d_name, 0, &inode); |
| if (!error) { |
| new = 0; |
| gfs2_holder_uninit(ghs); |
| break; |
| } else if (error != -ENOENT) { |
| gfs2_holder_uninit(ghs); |
| return error; |
| } |
| } |
| |
| d_instantiate(dentry, inode); |
| if (new) |
| mark_inode_dirty(inode); |
| |
| return 0; |
| } |
| |
| /** |
| * gfs2_lookup - Look up a filename in a directory and return its inode |
| * @dir: The directory inode |
| * @dentry: The dentry of the new inode |
| * @nd: passed from Linux VFS, ignored by us |
| * |
| * Called by the VFS layer. Lock dir and call gfs2_lookupi() |
| * |
| * Returns: errno |
| */ |
| |
| static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, |
| struct nameidata *nd) |
| { |
| struct gfs2_inode *dip = get_v2ip(dir); |
| struct gfs2_sbd *sdp = dip->i_sbd; |
| struct inode *inode = NULL; |
| int error; |
| |
| atomic_inc(&sdp->sd_ops_inode); |
| |
| if (!sdp->sd_args.ar_localcaching) |
| dentry->d_op = &gfs2_dops; |
| |
| error = gfs2_lookupi(dir, &dentry->d_name, 0, &inode); |
| if (error && error != -ENOENT) |
| return ERR_PTR(error); |
| |
| if (inode) |
| return d_splice_alias(inode, dentry); |
| d_add(dentry, inode); |
| |
| return NULL; |
| } |
| |
| /** |
| * gfs2_link - Link to a file |
| * @old_dentry: The inode to link |
| * @dir: Add link to this directory |
| * @dentry: The name of the link |
| * |
| * Link the inode in "old_dentry" into the directory "dir" with the |
| * name in "dentry". |
| * |
| * Returns: errno |
| */ |
| |
| static int gfs2_link(struct dentry *old_dentry, struct inode *dir, |
| struct dentry *dentry) |
| { |
| struct gfs2_inode *dip = get_v2ip(dir); |
| struct gfs2_sbd *sdp = dip->i_sbd; |
| struct inode *inode = old_dentry->d_inode; |
| struct gfs2_inode *ip = get_v2ip(inode); |
| struct gfs2_holder ghs[2]; |
| int alloc_required; |
| int error; |
| |
| atomic_inc(&sdp->sd_ops_inode); |
| |
| if (S_ISDIR(ip->i_di.di_mode)) |
| return -EPERM; |
| |
| gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
| gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); |
| |
| error = gfs2_glock_nq_m(2, ghs); |
| if (error) |
| goto out; |
| |
| error = gfs2_repermission(dir, MAY_WRITE | MAY_EXEC, NULL); |
| if (error) |
| goto out_gunlock; |
| |
| error = gfs2_dir_search(dip, &dentry->d_name, NULL, NULL); |
| switch (error) { |
| case -ENOENT: |
| break; |
| case 0: |
| error = -EEXIST; |
| default: |
| goto out_gunlock; |
| } |
| |
| error = -EINVAL; |
| if (!dip->i_di.di_nlink) |
| goto out_gunlock; |
| error = -EFBIG; |
| if (dip->i_di.di_entries == (uint32_t)-1) |
| goto out_gunlock; |
| error = -EPERM; |
| if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) |
| goto out_gunlock; |
| error = -EINVAL; |
| if (!ip->i_di.di_nlink) |
| goto out_gunlock; |
| error = -EMLINK; |
| if (ip->i_di.di_nlink == (uint32_t)-1) |
| goto out_gunlock; |
| |
| error = gfs2_diradd_alloc_required(dip, &dentry->d_name, |
| &alloc_required); |
| if (error) |
| goto out_gunlock; |
| |
| if (alloc_required) { |
| struct gfs2_alloc *al = gfs2_alloc_get(dip); |
| |
| error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); |
| if (error) |
| goto out_alloc; |
| |
| error = gfs2_quota_check(dip, dip->i_di.di_uid, |
| dip->i_di.di_gid); |
| if (error) |
| goto out_gunlock_q; |
| |
| al->al_requested = sdp->sd_max_dirres; |
| |
| error = gfs2_inplace_reserve(dip); |
| if (error) |
| goto out_gunlock_q; |
| |
| error = gfs2_trans_begin(sdp, |
| sdp->sd_max_dirres + |
| al->al_rgd->rd_ri.ri_length + |
| 2 * RES_DINODE + RES_STATFS + |
| RES_QUOTA, 0); |
| if (error) |
| goto out_ipres; |
| } else { |
| error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); |
| if (error) |
| goto out_ipres; |
| } |
| |
| error = gfs2_dir_add(dip, &dentry->d_name, &ip->i_num, |
| IF2DT(ip->i_di.di_mode)); |
| if (error) |
| goto out_end_trans; |
| |
| error = gfs2_change_nlink(ip, +1); |
| |
| out_end_trans: |
| gfs2_trans_end(sdp); |
| |
| out_ipres: |
| if (alloc_required) |
| gfs2_inplace_release(dip); |
| |
| out_gunlock_q: |
| if (alloc_required) |
| gfs2_quota_unlock(dip); |
| |
| out_alloc: |
| if (alloc_required) |
| gfs2_alloc_put(dip); |
| |
| out_gunlock: |
| gfs2_glock_dq_m(2, ghs); |
| |
| out: |
| gfs2_holder_uninit(ghs); |
| gfs2_holder_uninit(ghs + 1); |
| |
| if (!error) { |
| atomic_inc(&inode->i_count); |
| d_instantiate(dentry, inode); |
| mark_inode_dirty(inode); |
| } |
| |
| return error; |
| } |
| |
| /** |
| * gfs2_unlink - Unlink a file |
| * @dir: The inode of the directory containing the file to unlink |
| * @dentry: The file itself |
| * |
| * Unlink a file. Call gfs2_unlinki() |
| * |
| * Returns: errno |
| */ |
| |
| static int gfs2_unlink(struct inode *dir, struct dentry *dentry) |
| { |
| struct gfs2_inode *dip = get_v2ip(dir); |
| struct gfs2_sbd *sdp = dip->i_sbd; |
| struct gfs2_inode *ip = get_v2ip(dentry->d_inode); |
| struct gfs2_unlinked *ul; |
| struct gfs2_holder ghs[2]; |
| int error; |
| |
| atomic_inc(&sdp->sd_ops_inode); |
| |
| error = gfs2_unlinked_get(sdp, &ul); |
| if (error) |
| return error; |
| |
| gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
| gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); |
| |
| error = gfs2_glock_nq_m(2, ghs); |
| if (error) |
| goto out; |
| |
| error = gfs2_unlink_ok(dip, &dentry->d_name, ip); |
| if (error) |
| goto out_gunlock; |
| |
| error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF + |
| RES_UNLINKED, 0); |
| if (error) |
| goto out_gunlock; |
| |
| error = gfs2_unlinki(dip, &dentry->d_name, ip,ul); |
| |
| gfs2_trans_end(sdp); |
| |
| out_gunlock: |
| gfs2_glock_dq_m(2, ghs); |
| |
| out: |
| gfs2_holder_uninit(ghs); |
| gfs2_holder_uninit(ghs + 1); |
| |
| gfs2_unlinked_put(sdp, ul); |
| |
| return error; |
| } |
| |
| /** |
| * gfs2_symlink - Create a symlink |
| * @dir: The directory to create the symlink in |
| * @dentry: The dentry to put the symlink in |
| * @symname: The thing which the link points to |
| * |
| * Returns: errno |
| */ |
| |
| static int gfs2_symlink(struct inode *dir, struct dentry *dentry, |
| const char *symname) |
| { |
| struct gfs2_inode *dip = get_v2ip(dir), *ip; |
| struct gfs2_sbd *sdp = dip->i_sbd; |
| struct gfs2_holder ghs[2]; |
| struct inode *inode; |
| struct buffer_head *dibh; |
| int size; |
| int error; |
| |
| atomic_inc(&sdp->sd_ops_inode); |
| |
| /* Must be stuffed with a null terminator for gfs2_follow_link() */ |
| size = strlen(symname); |
| if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) |
| return -ENAMETOOLONG; |
| |
| gfs2_holder_init(dip->i_gl, 0, 0, ghs); |
| |
| inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO); |
| if (IS_ERR(inode)) { |
| gfs2_holder_uninit(ghs); |
| return PTR_ERR(inode); |
| } |
| |
| ip = get_gl2ip(ghs[1].gh_gl); |
| |
| ip->i_di.di_size = size; |
| |
| error = gfs2_meta_inode_buffer(ip, &dibh); |
| |
| if (!gfs2_assert_withdraw(sdp, !error)) { |
| gfs2_dinode_out(&ip->i_di, dibh->b_data); |
| memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, |
| size); |
| brelse(dibh); |
| } |
| |
| gfs2_trans_end(sdp); |
| if (dip->i_alloc.al_rgd) |
| gfs2_inplace_release(dip); |
| gfs2_quota_unlock(dip); |
| gfs2_alloc_put(dip); |
| |
| gfs2_glock_dq_uninit_m(2, ghs); |
| |
| d_instantiate(dentry, inode); |
| mark_inode_dirty(inode); |
| |
| return 0; |
| } |
| |
| /** |
| * gfs2_mkdir - Make a directory |
| * @dir: The parent directory of the new one |
| * @dentry: The dentry of the new directory |
| * @mode: The mode of the new directory |
| * |
| * Returns: errno |
| */ |
| |
| static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
| { |
| struct gfs2_inode *dip = get_v2ip(dir), *ip; |
| struct gfs2_sbd *sdp = dip->i_sbd; |
| struct gfs2_holder ghs[2]; |
| struct inode *inode; |
| struct buffer_head *dibh; |
| int error; |
| |
| atomic_inc(&sdp->sd_ops_inode); |
| |
| gfs2_holder_init(dip->i_gl, 0, 0, ghs); |
| |
| inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode); |
| if (IS_ERR(inode)) { |
| gfs2_holder_uninit(ghs); |
| return PTR_ERR(inode); |
| } |
| |
| ip = get_gl2ip(ghs[1].gh_gl); |
| |
| ip->i_di.di_nlink = 2; |
| ip->i_di.di_size = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); |
| ip->i_di.di_flags |= GFS2_DIF_JDATA; |
| ip->i_di.di_payload_format = GFS2_FORMAT_DE; |
| ip->i_di.di_entries = 2; |
| |
| error = gfs2_meta_inode_buffer(ip, &dibh); |
| |
| if (!gfs2_assert_withdraw(sdp, !error)) { |
| struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; |
| struct gfs2_dirent *dent; |
| |
| gfs2_dirent_alloc(ip, dibh, 1, &dent); |
| |
| dent->de_inum = di->di_num; /* already GFS2 endian */ |
| dent->de_hash = gfs2_disk_hash(".", 1); |
| dent->de_hash = cpu_to_be32(dent->de_hash); |
| dent->de_type = DT_DIR; |
| memcpy((char *) (dent + 1), ".", 1); |
| di->di_entries = cpu_to_be32(1); |
| |
| gfs2_dirent_alloc(ip, dibh, 2, &dent); |
| |
| gfs2_inum_out(&dip->i_num, (char *) &dent->de_inum); |
| dent->de_hash = gfs2_disk_hash("..", 2); |
| dent->de_hash = cpu_to_be32(dent->de_hash); |
| dent->de_type = DT_DIR; |
| memcpy((char *) (dent + 1), "..", 2); |
| |
| gfs2_dinode_out(&ip->i_di, (char *)di); |
| |
| brelse(dibh); |
| } |
| |
| error = gfs2_change_nlink(dip, +1); |
| gfs2_assert_withdraw(sdp, !error); /* dip already pinned */ |
| |
| gfs2_trans_end(sdp); |
| if (dip->i_alloc.al_rgd) |
| gfs2_inplace_release(dip); |
| gfs2_quota_unlock(dip); |
| gfs2_alloc_put(dip); |
| |
| gfs2_glock_dq_uninit_m(2, ghs); |
| |
| d_instantiate(dentry, inode); |
| mark_inode_dirty(inode); |
| |
| return 0; |
| } |
| |
| /** |
| * gfs2_rmdir - Remove a directory |
| * @dir: The parent directory of the directory to be removed |
| * @dentry: The dentry of the directory to remove |
| * |
| * Remove a directory. Call gfs2_rmdiri() |
| * |
| * Returns: errno |
| */ |
| |
| static int gfs2_rmdir(struct inode *dir, struct dentry *dentry) |
| { |
| struct gfs2_inode *dip = get_v2ip(dir); |
| struct gfs2_sbd *sdp = dip->i_sbd; |
| struct gfs2_inode *ip = get_v2ip(dentry->d_inode); |
| struct gfs2_unlinked *ul; |
| struct gfs2_holder ghs[2]; |
| int error; |
| |
| atomic_inc(&sdp->sd_ops_inode); |
| |
| error = gfs2_unlinked_get(sdp, &ul); |
| if (error) |
| return error; |
| |
| gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
| gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); |
| |
| error = gfs2_glock_nq_m(2, ghs); |
| if (error) |
| goto out; |
| |
| error = gfs2_unlink_ok(dip, &dentry->d_name, ip); |
| if (error) |
| goto out_gunlock; |
| |
| if (ip->i_di.di_entries < 2) { |
| if (gfs2_consist_inode(ip)) |
| gfs2_dinode_print(&ip->i_di); |
| error = -EIO; |
| goto out_gunlock; |
| } |
| if (ip->i_di.di_entries > 2) { |
| error = -ENOTEMPTY; |
| goto out_gunlock; |
| } |
| |
| error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + |
| RES_UNLINKED, 0); |
| if (error) |
| goto out_gunlock; |
| |
| error = gfs2_rmdiri(dip, &dentry->d_name, ip, ul); |
| |
| gfs2_trans_end(sdp); |
| |
| out_gunlock: |
| gfs2_glock_dq_m(2, ghs); |
| |
| out: |
| gfs2_holder_uninit(ghs); |
| gfs2_holder_uninit(ghs + 1); |
| |
| gfs2_unlinked_put(sdp, ul); |
| |
| return error; |
| } |
| |
| /** |
| * gfs2_mknod - Make a special file |
| * @dir: The directory in which the special file will reside |
| * @dentry: The dentry of the special file |
| * @mode: The mode of the special file |
| * @rdev: The device specification of the special file |
| * |
| */ |
| |
| static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode, |
| dev_t dev) |
| { |
| struct gfs2_inode *dip = get_v2ip(dir), *ip; |
| struct gfs2_sbd *sdp = dip->i_sbd; |
| struct gfs2_holder ghs[2]; |
| struct inode *inode; |
| struct buffer_head *dibh; |
| uint32_t major = 0, minor = 0; |
| int error; |
| |
| atomic_inc(&sdp->sd_ops_inode); |
| |
| switch (mode & S_IFMT) { |
| case S_IFBLK: |
| case S_IFCHR: |
| major = MAJOR(dev); |
| minor = MINOR(dev); |
| break; |
| case S_IFIFO: |
| case S_IFSOCK: |
| break; |
| default: |
| return -EOPNOTSUPP; |
| }; |
| |
| gfs2_holder_init(dip->i_gl, 0, 0, ghs); |
| |
| inode = gfs2_createi(ghs, &dentry->d_name, mode); |
| if (IS_ERR(inode)) { |
| gfs2_holder_uninit(ghs); |
| return PTR_ERR(inode); |
| } |
| |
| ip = get_gl2ip(ghs[1].gh_gl); |
| |
| ip->i_di.di_major = major; |
| ip->i_di.di_minor = minor; |
| |
| error = gfs2_meta_inode_buffer(ip, &dibh); |
| |
| if (!gfs2_assert_withdraw(sdp, !error)) { |
| gfs2_dinode_out(&ip->i_di, dibh->b_data); |
| brelse(dibh); |
| } |
| |
| gfs2_trans_end(sdp); |
| if (dip->i_alloc.al_rgd) |
| gfs2_inplace_release(dip); |
| gfs2_quota_unlock(dip); |
| gfs2_alloc_put(dip); |
| |
| gfs2_glock_dq_uninit_m(2, ghs); |
| |
| d_instantiate(dentry, inode); |
| mark_inode_dirty(inode); |
| |
| return 0; |
| } |
| |
| /** |
| * gfs2_rename - Rename a file |
| * @odir: Parent directory of old file name |
| * @odentry: The old dentry of the file |
| * @ndir: Parent directory of new file name |
| * @ndentry: The new dentry of the file |
| * |
| * Returns: errno |
| */ |
| |
| static int gfs2_rename(struct inode *odir, struct dentry *odentry, |
| struct inode *ndir, struct dentry *ndentry) |
| { |
| struct gfs2_inode *odip = get_v2ip(odir); |
| struct gfs2_inode *ndip = get_v2ip(ndir); |
| struct gfs2_inode *ip = get_v2ip(odentry->d_inode); |
| struct gfs2_inode *nip = NULL; |
| struct gfs2_sbd *sdp = odip->i_sbd; |
| struct gfs2_unlinked *ul; |
| struct gfs2_holder ghs[4], r_gh; |
| unsigned int num_gh; |
| int dir_rename = 0; |
| int alloc_required; |
| unsigned int x; |
| int error; |
| |
| atomic_inc(&sdp->sd_ops_inode); |
| |
| if (ndentry->d_inode) { |
| nip = get_v2ip(ndentry->d_inode); |
| if (ip == nip) |
| return 0; |
| } |
| |
| error = gfs2_unlinked_get(sdp, &ul); |
| if (error) |
| return error; |
| |
| /* Make sure we aren't trying to move a dirctory into it's subdir */ |
| |
| if (S_ISDIR(ip->i_di.di_mode) && odip != ndip) { |
| dir_rename = 1; |
| |
| error = gfs2_glock_nq_init(sdp->sd_rename_gl, |
| LM_ST_EXCLUSIVE, 0, |
| &r_gh); |
| if (error) |
| goto out; |
| |
| error = gfs2_ok_to_move(ip, ndip); |
| if (error) |
| goto out_gunlock_r; |
| } |
| |
| gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
| gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); |
| gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); |
| num_gh = 3; |
| |
| if (nip) |
| gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); |
| |
| error = gfs2_glock_nq_m(num_gh, ghs); |
| if (error) |
| goto out_uninit; |
| |
| /* Check out the old directory */ |
| |
| error = gfs2_unlink_ok(odip, &odentry->d_name, ip); |
| if (error) |
| goto out_gunlock; |
| |
| /* Check out the new directory */ |
| |
| if (nip) { |
| error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); |
| if (error) |
| goto out_gunlock; |
| |
| if (S_ISDIR(nip->i_di.di_mode)) { |
| if (nip->i_di.di_entries < 2) { |
| if (gfs2_consist_inode(nip)) |
| gfs2_dinode_print(&nip->i_di); |
| error = -EIO; |
| goto out_gunlock; |
| } |
| if (nip->i_di.di_entries > 2) { |
| error = -ENOTEMPTY; |
| goto out_gunlock; |
| } |
| } |
| } else { |
| error = gfs2_repermission(ndir, MAY_WRITE | MAY_EXEC, NULL); |
| if (error) |
| goto out_gunlock; |
| |
| error = gfs2_dir_search(ndip, &ndentry->d_name, NULL, NULL); |
| switch (error) { |
| case -ENOENT: |
| error = 0; |
| break; |
| case 0: |
| error = -EEXIST; |
| default: |
| goto out_gunlock; |
| }; |
| |
| if (odip != ndip) { |
| if (!ndip->i_di.di_nlink) { |
| error = -EINVAL; |
| goto out_gunlock; |
| } |
| if (ndip->i_di.di_entries == (uint32_t)-1) { |
| error = -EFBIG; |
| goto out_gunlock; |
| } |
| if (S_ISDIR(ip->i_di.di_mode) && |
| ndip->i_di.di_nlink == (uint32_t)-1) { |
| error = -EMLINK; |
| goto out_gunlock; |
| } |
| } |
| } |
| |
| /* Check out the dir to be renamed */ |
| |
| if (dir_rename) { |
| error = gfs2_repermission(odentry->d_inode, MAY_WRITE, NULL); |
| if (error) |
| goto out_gunlock; |
| } |
| |
| error = gfs2_diradd_alloc_required(ndip, &ndentry->d_name, |
| &alloc_required); |
| if (error) |
| goto out_gunlock; |
| |
| if (alloc_required) { |
| struct gfs2_alloc *al = gfs2_alloc_get(ndip); |
| |
| error = gfs2_quota_lock(ndip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); |
| if (error) |
| goto out_alloc; |
| |
| error = gfs2_quota_check(ndip, ndip->i_di.di_uid, |
| ndip->i_di.di_gid); |
| if (error) |
| goto out_gunlock_q; |
| |
| al->al_requested = sdp->sd_max_dirres; |
| |
| error = gfs2_inplace_reserve(ndip); |
| if (error) |
| goto out_gunlock_q; |
| |
| error = gfs2_trans_begin(sdp, |
| sdp->sd_max_dirres + |
| al->al_rgd->rd_ri.ri_length + |
| 4 * RES_DINODE + 4 * RES_LEAF + |
| RES_UNLINKED + RES_STATFS + |
| RES_QUOTA, 0); |
| if (error) |
| goto out_ipreserv; |
| } else { |
| error = gfs2_trans_begin(sdp, 4 * RES_DINODE + |
| 5 * RES_LEAF + |
| RES_UNLINKED, 0); |
| if (error) |
| goto out_gunlock; |
| } |
| |
| /* Remove the target file, if it exists */ |
| |
| if (nip) { |
| if (S_ISDIR(nip->i_di.di_mode)) |
| error = gfs2_rmdiri(ndip, &ndentry->d_name, nip, ul); |
| else |
| error = gfs2_unlinki(ndip, &ndentry->d_name, nip, ul); |
| if (error) |
| goto out_end_trans; |
| } |
| |
| if (dir_rename) { |
| struct qstr name; |
| name.len = 2; |
| name.name = ".."; |
| |
| error = gfs2_change_nlink(ndip, +1); |
| if (error) |
| goto out_end_trans; |
| error = gfs2_change_nlink(odip, -1); |
| if (error) |
| goto out_end_trans; |
| |
| error = gfs2_dir_mvino(ip, &name, &ndip->i_num, DT_DIR); |
| if (error) |
| goto out_end_trans; |
| } else { |
| struct buffer_head *dibh; |
| error = gfs2_meta_inode_buffer(ip, &dibh); |
| if (error) |
| goto out_end_trans; |
| ip->i_di.di_ctime = get_seconds(); |
| gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
| gfs2_dinode_out(&ip->i_di, dibh->b_data); |
| brelse(dibh); |
| } |
| |
| error = gfs2_dir_del(odip, &odentry->d_name); |
| if (error) |
| goto out_end_trans; |
| |
| error = gfs2_dir_add(ndip, &ndentry->d_name, &ip->i_num, |
| IF2DT(ip->i_di.di_mode)); |
| if (error) |
| goto out_end_trans; |
| |
| out_end_trans: |
| gfs2_trans_end(sdp); |
| |
| out_ipreserv: |
| if (alloc_required) |
| gfs2_inplace_release(ndip); |
| |
| out_gunlock_q: |
| if (alloc_required) |
| gfs2_quota_unlock(ndip); |
| |
| out_alloc: |
| if (alloc_required) |
| gfs2_alloc_put(ndip); |
| |
| out_gunlock: |
| gfs2_glock_dq_m(num_gh, ghs); |
| |
| out_uninit: |
| for (x = 0; x < num_gh; x++) |
| gfs2_holder_uninit(ghs + x); |
| |
| out_gunlock_r: |
| if (dir_rename) |
| gfs2_glock_dq_uninit(&r_gh); |
| |
| out: |
| gfs2_unlinked_put(sdp, ul); |
| |
| return error; |
| } |
| |
| /** |
| * gfs2_readlink - Read the value of a symlink |
| * @dentry: the symlink |
| * @buf: the buffer to read the symlink data into |
| * @size: the size of the buffer |
| * |
| * Returns: errno |
| */ |
| |
| static int gfs2_readlink(struct dentry *dentry, char __user *user_buf, |
| int user_size) |
| { |
| struct gfs2_inode *ip = get_v2ip(dentry->d_inode); |
| char array[GFS2_FAST_NAME_SIZE], *buf = array; |
| unsigned int len = GFS2_FAST_NAME_SIZE; |
| int error; |
| |
| atomic_inc(&ip->i_sbd->sd_ops_inode); |
| |
| error = gfs2_readlinki(ip, &buf, &len); |
| if (error) |
| return error; |
| |
| if (user_size > len - 1) |
| user_size = len - 1; |
| |
| if (copy_to_user(user_buf, buf, user_size)) |
| error = -EFAULT; |
| else |
| error = user_size; |
| |
| if (buf != array) |
| kfree(buf); |
| |
| return error; |
| } |
| |
| /** |
| * gfs2_follow_link - Follow a symbolic link |
| * @dentry: The dentry of the link |
| * @nd: Data that we pass to vfs_follow_link() |
| * |
| * This can handle symlinks of any size. It is optimised for symlinks |
| * under GFS2_FAST_NAME_SIZE. |
| * |
| * Returns: 0 on success or error code |
| */ |
| |
| static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) |
| { |
| struct gfs2_inode *ip = get_v2ip(dentry->d_inode); |
| char array[GFS2_FAST_NAME_SIZE], *buf = array; |
| unsigned int len = GFS2_FAST_NAME_SIZE; |
| int error; |
| |
| atomic_inc(&ip->i_sbd->sd_ops_inode); |
| |
| error = gfs2_readlinki(ip, &buf, &len); |
| if (!error) { |
| error = vfs_follow_link(nd, buf); |
| if (buf != array) |
| kfree(buf); |
| } |
| |
| return ERR_PTR(error); |
| } |
| |
| /** |
| * gfs2_permission - |
| * @inode: |
| * @mask: |
| * @nd: passed from Linux VFS, ignored by us |
| * |
| * Returns: errno |
| */ |
| |
| static int gfs2_permission(struct inode *inode, int mask, struct nameidata *nd) |
| { |
| struct gfs2_inode *ip = get_v2ip(inode); |
| struct gfs2_holder i_gh; |
| int error; |
| |
| atomic_inc(&ip->i_sbd->sd_ops_inode); |
| |
| if (ip->i_vn == ip->i_gl->gl_vn) |
| return generic_permission(inode, mask, gfs2_check_acl); |
| |
| error = gfs2_glock_nq_init(ip->i_gl, |
| LM_ST_SHARED, LM_FLAG_ANY, |
| &i_gh); |
| if (!error) { |
| error = generic_permission(inode, mask, gfs2_check_acl_locked); |
| gfs2_glock_dq_uninit(&i_gh); |
| } |
| |
| return error; |
| } |
| |
| static int setattr_size(struct inode *inode, struct iattr *attr) |
| { |
| struct gfs2_inode *ip = get_v2ip(inode); |
| int error; |
| |
| if (attr->ia_size != ip->i_di.di_size) { |
| error = vmtruncate(inode, attr->ia_size); |
| if (error) |
| return error; |
| } |
| |
| error = gfs2_truncatei(ip, attr->ia_size); |
| if (error) |
| return error; |
| |
| return error; |
| } |
| |
| static int setattr_chown(struct inode *inode, struct iattr *attr) |
| { |
| struct gfs2_inode *ip = get_v2ip(inode); |
| struct gfs2_sbd *sdp = ip->i_sbd; |
| struct buffer_head *dibh; |
| uint32_t ouid, ogid, nuid, ngid; |
| int error; |
| |
| ouid = ip->i_di.di_uid; |
| ogid = ip->i_di.di_gid; |
| nuid = attr->ia_uid; |
| ngid = attr->ia_gid; |
| |
| if (!(attr->ia_valid & ATTR_UID) || ouid == nuid) |
| ouid = nuid = NO_QUOTA_CHANGE; |
| if (!(attr->ia_valid & ATTR_GID) || ogid == ngid) |
| ogid = ngid = NO_QUOTA_CHANGE; |
| |
| gfs2_alloc_get(ip); |
| |
| error = gfs2_quota_lock(ip, nuid, ngid); |
| if (error) |
| goto out_alloc; |
| |
| if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { |
| error = gfs2_quota_check(ip, nuid, ngid); |
| if (error) |
| goto out_gunlock_q; |
| } |
| |
| error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); |
| if (error) |
| goto out_gunlock_q; |
| |
| error = gfs2_meta_inode_buffer(ip, &dibh); |
| if (error) |
| goto out_end_trans; |
| |
| error = inode_setattr(inode, attr); |
| gfs2_assert_warn(sdp, !error); |
| gfs2_inode_attr_out(ip); |
| |
| gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
| gfs2_dinode_out(&ip->i_di, dibh->b_data); |
| brelse(dibh); |
| |
| if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { |
| gfs2_quota_change(ip, -ip->i_di.di_blocks, |
| ouid, ogid); |
| gfs2_quota_change(ip, ip->i_di.di_blocks, |
| nuid, ngid); |
| } |
| |
| out_end_trans: |
| gfs2_trans_end(sdp); |
| |
| out_gunlock_q: |
| gfs2_quota_unlock(ip); |
| |
| out_alloc: |
| gfs2_alloc_put(ip); |
| |
| return error; |
| } |
| |
| /** |
| * gfs2_setattr - Change attributes on an inode |
| * @dentry: The dentry which is changing |
| * @attr: The structure describing the change |
| * |
| * The VFS layer wants to change one or more of an inodes attributes. Write |
| * that change out to disk. |
| * |
| * Returns: errno |
| */ |
| |
| static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) |
| { |
| struct inode *inode = dentry->d_inode; |
| struct gfs2_inode *ip = get_v2ip(inode); |
| struct gfs2_holder i_gh; |
| int error; |
| |
| atomic_inc(&ip->i_sbd->sd_ops_inode); |
| |
| error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); |
| if (error) |
| return error; |
| |
| error = -EPERM; |
| if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) |
| goto out; |
| |
| error = inode_change_ok(inode, attr); |
| if (error) |
| goto out; |
| |
| if (attr->ia_valid & ATTR_SIZE) |
| error = setattr_size(inode, attr); |
| else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) |
| error = setattr_chown(inode, attr); |
| else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) |
| error = gfs2_acl_chmod(ip, attr); |
| else |
| error = gfs2_setattr_simple(ip, attr); |
| |
| out: |
| gfs2_glock_dq_uninit(&i_gh); |
| |
| if (!error) |
| mark_inode_dirty(inode); |
| |
| return error; |
| } |
| |
| /** |
| * gfs2_getattr - Read out an inode's attributes |
| * @mnt: ? |
| * @dentry: The dentry to stat |
| * @stat: The inode's stats |
| * |
| * Returns: errno |
| */ |
| |
| static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, |
| struct kstat *stat) |
| { |
| struct inode *inode = dentry->d_inode; |
| struct gfs2_inode *ip = get_v2ip(inode); |
| struct gfs2_holder gh; |
| int error; |
| |
| atomic_inc(&ip->i_sbd->sd_ops_inode); |
| |
| error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); |
| if (!error) { |
| generic_fillattr(inode, stat); |
| gfs2_glock_dq_uninit(&gh); |
| } |
| |
| return error; |
| } |
| |
| static int gfs2_setxattr(struct dentry *dentry, const char *name, |
| const void *data, size_t size, int flags) |
| { |
| struct gfs2_inode *ip = get_v2ip(dentry->d_inode); |
| struct gfs2_ea_request er; |
| |
| atomic_inc(&ip->i_sbd->sd_ops_inode); |
| |
| memset(&er, 0, sizeof(struct gfs2_ea_request)); |
| er.er_type = gfs2_ea_name2type(name, &er.er_name); |
| if (er.er_type == GFS2_EATYPE_UNUSED) |
| return -EOPNOTSUPP; |
| er.er_data = (char *)data; |
| er.er_name_len = strlen(er.er_name); |
| er.er_data_len = size; |
| er.er_flags = flags; |
| |
| gfs2_assert_warn(ip->i_sbd, !(er.er_flags & GFS2_ERF_MODE)); |
| |
| return gfs2_ea_set(ip, &er); |
| } |
| |
| static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, |
| void *data, size_t size) |
| { |
| struct gfs2_ea_request er; |
| |
| atomic_inc(&get_v2sdp(dentry->d_inode->i_sb)->sd_ops_inode); |
| |
| memset(&er, 0, sizeof(struct gfs2_ea_request)); |
| er.er_type = gfs2_ea_name2type(name, &er.er_name); |
| if (er.er_type == GFS2_EATYPE_UNUSED) |
| return -EOPNOTSUPP; |
| er.er_data = data; |
| er.er_name_len = strlen(er.er_name); |
| er.er_data_len = size; |
| |
| return gfs2_ea_get(get_v2ip(dentry->d_inode), &er); |
| } |
| |
| static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size) |
| { |
| struct gfs2_ea_request er; |
| |
| atomic_inc(&get_v2sdp(dentry->d_inode->i_sb)->sd_ops_inode); |
| |
| memset(&er, 0, sizeof(struct gfs2_ea_request)); |
| er.er_data = (size) ? buffer : NULL; |
| er.er_data_len = size; |
| |
| return gfs2_ea_list(get_v2ip(dentry->d_inode), &er); |
| } |
| |
| static int gfs2_removexattr(struct dentry *dentry, const char *name) |
| { |
| struct gfs2_ea_request er; |
| |
| atomic_inc(&get_v2sdp(dentry->d_inode->i_sb)->sd_ops_inode); |
| |
| memset(&er, 0, sizeof(struct gfs2_ea_request)); |
| er.er_type = gfs2_ea_name2type(name, &er.er_name); |
| if (er.er_type == GFS2_EATYPE_UNUSED) |
| return -EOPNOTSUPP; |
| er.er_name_len = strlen(er.er_name); |
| |
| return gfs2_ea_remove(get_v2ip(dentry->d_inode), &er); |
| } |
| |
| struct inode_operations gfs2_file_iops = { |
| .permission = gfs2_permission, |
| .setattr = gfs2_setattr, |
| .getattr = gfs2_getattr, |
| .setxattr = gfs2_setxattr, |
| .getxattr = gfs2_getxattr, |
| .listxattr = gfs2_listxattr, |
| .removexattr = gfs2_removexattr, |
| }; |
| |
| struct inode_operations gfs2_dev_iops = { |
| .permission = gfs2_permission, |
| .setattr = gfs2_setattr, |
| .getattr = gfs2_getattr, |
| .setxattr = gfs2_setxattr, |
| .getxattr = gfs2_getxattr, |
| .listxattr = gfs2_listxattr, |
| .removexattr = gfs2_removexattr, |
| }; |
| |
| struct inode_operations gfs2_dir_iops = { |
| .create = gfs2_create, |
| .lookup = gfs2_lookup, |
| .link = gfs2_link, |
| .unlink = gfs2_unlink, |
| .symlink = gfs2_symlink, |
| .mkdir = gfs2_mkdir, |
| .rmdir = gfs2_rmdir, |
| .mknod = gfs2_mknod, |
| .rename = gfs2_rename, |
| .permission = gfs2_permission, |
| .setattr = gfs2_setattr, |
| .getattr = gfs2_getattr, |
| .setxattr = gfs2_setxattr, |
| .getxattr = gfs2_getxattr, |
| .listxattr = gfs2_listxattr, |
| .removexattr = gfs2_removexattr, |
| }; |
| |
| struct inode_operations gfs2_symlink_iops = { |
| .readlink = gfs2_readlink, |
| .follow_link = gfs2_follow_link, |
| .permission = gfs2_permission, |
| .setattr = gfs2_setattr, |
| .getattr = gfs2_getattr, |
| .setxattr = gfs2_setxattr, |
| .getxattr = gfs2_getxattr, |
| .listxattr = gfs2_listxattr, |
| .removexattr = gfs2_removexattr, |
| }; |
| |