diff options
Diffstat (limited to 'fs/gfs2/ops_inode.c')
| -rw-r--r-- | fs/gfs2/ops_inode.c | 1612 |
1 files changed, 0 insertions, 1612 deletions
diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c deleted file mode 100644 index 12cbea7502c..00000000000 --- a/fs/gfs2/ops_inode.c +++ /dev/null @@ -1,1612 +0,0 @@ -/* - * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. - * Copyright (C) 2004-2006 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 version 2. - */ - -#include <linux/slab.h> -#include <linux/spinlock.h> -#include <linux/completion.h> -#include <linux/buffer_head.h> -#include <linux/namei.h> -#include <linux/mm.h> -#include <linux/xattr.h> -#include <linux/posix_acl.h> -#include <linux/gfs2_ondisk.h> -#include <linux/crc32.h> -#include <linux/fiemap.h> -#include <linux/swap.h> -#include <linux/falloc.h> -#include <asm/uaccess.h> - -#include "gfs2.h" -#include "incore.h" -#include "acl.h" -#include "bmap.h" -#include "dir.h" -#include "xattr.h" -#include "glock.h" -#include "inode.h" -#include "meta_io.h" -#include "quota.h" -#include "rgrp.h" -#include "trans.h" -#include "util.h" -#include "super.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 = GFS2_I(dir); - struct gfs2_sbd *sdp = GFS2_SB(dir); - struct gfs2_holder ghs[2]; - struct inode *inode; - - gfs2_holder_init(dip->i_gl, 0, 0, ghs); - - for (;;) { - inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode, 0); - 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); - mark_inode_dirty(inode); - break; - } else if (PTR_ERR(inode) != -EEXIST || - (nd && nd->flags & LOOKUP_EXCL)) { - gfs2_holder_uninit(ghs); - return PTR_ERR(inode); - } - - inode = gfs2_lookupi(dir, &dentry->d_name, 0); - if (inode) { - if (!IS_ERR(inode)) { - gfs2_holder_uninit(ghs); - break; - } else { - gfs2_holder_uninit(ghs); - return PTR_ERR(inode); - } - } - } - - d_instantiate(dentry, 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 inode *inode = NULL; - - dentry->d_op = &gfs2_dops; - - inode = gfs2_lookupi(dir, &dentry->d_name, 0); - if (inode && IS_ERR(inode)) - return ERR_CAST(inode); - - if (inode) { - struct gfs2_glock *gl = GFS2_I(inode)->i_gl; - struct gfs2_holder gh; - int error; - error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); - if (error) { - iput(inode); - return ERR_PTR(error); - } - gfs2_glock_dq_uninit(&gh); - 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 = GFS2_I(dir); - struct gfs2_sbd *sdp = GFS2_SB(dir); - struct inode *inode = old_dentry->d_inode; - struct gfs2_inode *ip = GFS2_I(inode); - struct gfs2_holder ghs[2]; - int alloc_required; - int error; - - if (S_ISDIR(inode->i_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(ghs); /* parent */ - if (error) - goto out_parent; - - error = gfs2_glock_nq(ghs + 1); /* child */ - if (error) - goto out_child; - - error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); - if (error) - goto out_gunlock; - - error = gfs2_dir_check(dir, &dentry->d_name, NULL); - switch (error) { - case -ENOENT: - break; - case 0: - error = -EEXIST; - default: - goto out_gunlock; - } - - error = -EINVAL; - if (!dip->i_inode.i_nlink) - goto out_gunlock; - error = -EFBIG; - if (dip->i_entries == (u32)-1) - goto out_gunlock; - error = -EPERM; - if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) - goto out_gunlock; - error = -EINVAL; - if (!ip->i_inode.i_nlink) - goto out_gunlock; - error = -EMLINK; - if (ip->i_inode.i_nlink == (u32)-1) - goto out_gunlock; - - alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name); - if (error < 0) - goto out_gunlock; - error = 0; - - if (alloc_required) { - struct gfs2_alloc *al = gfs2_alloc_get(dip); - if (!al) { - error = -ENOMEM; - goto out_gunlock; - } - - error = gfs2_quota_lock_check(dip); - if (error) - goto out_alloc; - - 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 + - gfs2_rg_blocks(al) + - 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(dir, &dentry->d_name, ip, IF2DT(inode->i_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(ghs + 1); -out_child: - gfs2_glock_dq(ghs); -out_parent: - gfs2_holder_uninit(ghs); - gfs2_holder_uninit(ghs + 1); - if (!error) { - ihold(inode); - d_instantiate(dentry, inode); - mark_inode_dirty(inode); - } - return error; -} - -/* - * gfs2_unlink_ok - check to see that a inode is still in a directory - * @dip: the directory - * @name: the name of the file - * @ip: the inode - * - * Assumes that the lock on (at least) @dip is held. - * - * Returns: 0 if the parent/child relationship is correct, errno if it isn't - */ - -static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, - const struct gfs2_inode *ip) -{ - int error; - - if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) - return -EPERM; - - if ((dip->i_inode.i_mode & S_ISVTX) && - dip->i_inode.i_uid != current_fsuid() && - ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER)) - return -EPERM; - - if (IS_APPEND(&dip->i_inode)) - return -EPERM; - - error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); - if (error) - return error; - - error = gfs2_dir_check(&dip->i_inode, name, ip); - if (error) - return error; - - return 0; -} - -/** - * 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 = GFS2_I(dir); - struct gfs2_sbd *sdp = GFS2_SB(dir); - struct gfs2_inode *ip = GFS2_I(dentry->d_inode); - struct gfs2_holder ghs[3]; - struct gfs2_rgrpd *rgd; - struct gfs2_holder ri_gh; - int error; - - error = gfs2_rindex_hold(sdp, &ri_gh); - 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); - - rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr); - gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); - - - error = gfs2_glock_nq(ghs); /* parent */ - if (error) - goto out_parent; - - error = gfs2_glock_nq(ghs + 1); /* child */ - if (error) - goto out_child; - - error = gfs2_glock_nq(ghs + 2); /* rgrp */ - if (error) - goto out_rgrp; - - 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_RG_BIT, 0); - if (error) - goto out_gunlock; - - error = gfs2_dir_del(dip, &dentry->d_name); - if (error) - goto out_end_trans; - - error = gfs2_change_nlink(ip, -1); - -out_end_trans: - gfs2_trans_end(sdp); -out_gunlock: - gfs2_glock_dq(ghs + 2); -out_rgrp: - gfs2_holder_uninit(ghs + 2); - gfs2_glock_dq(ghs + 1); -out_child: - gfs2_holder_uninit(ghs + 1); - gfs2_glock_dq(ghs); -out_parent: - gfs2_holder_uninit(ghs); - gfs2_glock_dq_uninit(&ri_gh); - 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 = GFS2_I(dir), *ip; - struct gfs2_sbd *sdp = GFS2_SB(dir); - struct gfs2_holder ghs[2]; - struct inode *inode; - struct buffer_head *dibh; - int size; - int error; - - /* 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, 0); - if (IS_ERR(inode)) { - gfs2_holder_uninit(ghs); - return PTR_ERR(inode); - } - - ip = ghs[1].gh_gl->gl_object; - - i_size_write(inode, size); - - error = gfs2_meta_inode_buffer(ip, &dibh); - - if (!gfs2_assert_withdraw(sdp, !error)) { - gfs2_dinode_out(ip, 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 = GFS2_I(dir), *ip; - struct gfs2_sbd *sdp = GFS2_SB(dir); - struct gfs2_holder ghs[2]; - struct inode *inode; - struct buffer_head *dibh; - int error; - - gfs2_holder_init(dip->i_gl, 0, 0, ghs); - - inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0); - if (IS_ERR(inode)) { - gfs2_holder_uninit(ghs); - return PTR_ERR(inode); - } - - ip = ghs[1].gh_gl->gl_object; - - ip->i_inode.i_nlink = 2; - i_size_write(inode, sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)); - ip->i_diskflags |= GFS2_DIF_JDATA; - ip->i_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 = (struct gfs2_dirent *)(di+1); - - gfs2_trans_add_bh(ip->i_gl, dibh, 1); - gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); - dent->de_inum = di->di_num; /* already GFS2 endian */ - dent->de_type = cpu_to_be16(DT_DIR); - di->di_entries = cpu_to_be32(1); - - dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); - gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); - - gfs2_inum_out(dip, dent); - dent->de_type = cpu_to_be16(DT_DIR); - - gfs2_dinode_out(ip, 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_rmdiri - Remove a directory - * @dip: The parent directory of the directory to be removed - * @name: The name of the directory to be removed - * @ip: The GFS2 inode of the directory to be removed - * - * Assumes Glocks on dip and ip are held - * - * Returns: errno - */ - -static int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, - struct gfs2_inode *ip) -{ - int error; - - if (ip->i_entries != 2) { - if (gfs2_consist_inode(ip)) - gfs2_dinode_print(ip); - return -EIO; - } - - error = gfs2_dir_del(dip, name); - if (error) - return error; - - error = gfs2_change_nlink(dip, -1); - if (error) - return error; - - error = gfs2_dir_del(ip, &gfs2_qdot); - if (error) - return error; - - error = gfs2_dir_del(ip, &gfs2_qdotdot); - if (error) - return error; - - /* It looks odd, but it really should be done twice */ - error = gfs2_change_nlink(ip, -1); - if (error) - return error; - - error = gfs2_change_nlink(ip, -1); - if (error) - return error; - - return error; -} - -/** - * 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 = GFS2_I(dir); - struct gfs2_sbd *sdp = GFS2_SB(dir); - struct gfs2_inode *ip = GFS2_I(dentry->d_inode); - struct gfs2_holder ghs[3]; - struct gfs2_rgrpd *rgd; - struct gfs2_holder ri_gh; - int error; - - error = gfs2_rindex_hold(sdp, &ri_gh); - 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); - - rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr); - gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); - - error = gfs2_glock_nq(ghs); /* parent */ - if (error) - goto out_parent; - - error = gfs2_glock_nq(ghs + 1); /* child */ - if (error) - goto out_child; - - error = gfs2_glock_nq(ghs + 2); /* rgrp */ - if (error) - goto out_rgrp; - - error = gfs2_unlink_ok(dip, &dentry->d_name, ip); - if (error) - goto out_gunlock; - - if (ip->i_entries < 2) { - if (gfs2_consist_inode(ip)) - gfs2_dinode_print(ip); - error = -EIO; - goto out_gunlock; - } - if (ip->i_entries > 2) { - error = -ENOTEMPTY; - goto out_gunlock; - } - - error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0); - if (error) - goto out_gunlock; - - error = gfs2_rmdiri(dip, &dentry->d_name, ip); - - gfs2_trans_end(sdp); - -out_gunlock: - gfs2_glock_dq(ghs + 2); -out_rgrp: - gfs2_holder_uninit(ghs + 2); - gfs2_glock_dq(ghs + 1); -out_child: - gfs2_holder_uninit(ghs + 1); - gfs2_glock_dq(ghs); -out_parent: - gfs2_holder_uninit(ghs); - gfs2_glock_dq_uninit(&ri_gh); - 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 = GFS2_I(dir); - struct gfs2_sbd *sdp = GFS2_SB(dir); - struct gfs2_holder ghs[2]; - struct inode *inode; - - gfs2_holder_init(dip->i_gl, 0, 0, ghs); - - inode = gfs2_createi(ghs, &dentry->d_name, mode, dev); - if (IS_ERR(inode)) { - gfs2_holder_uninit(ghs); - return PTR_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); - - d_instantiate(dentry, inode); - mark_inode_dirty(inode); - - return 0; -} - -/* - * gfs2_ok_to_move - check if it's ok to move a directory to another directory - * @this: move this - * @to: to here - * - * Follow @to back to the root and make sure we don't encounter @this - * Assumes we already hold the rename lock. - * - * Returns: errno - */ - -static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) -{ - struct inode *dir = &to->i_inode; - struct super_block *sb = dir->i_sb; - struct inode *tmp; - int error = 0; - - igrab(dir); - - for (;;) { - if (dir == &this->i_inode) { - error = -EINVAL; - break; - } - if (dir == sb->s_root->d_inode) { - error = 0; - break; - } - - tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); - if (IS_ERR(tmp)) { - error = PTR_ERR(tmp); - break; - } - - iput(dir); - dir = tmp; - } - - iput(dir); - - return error; -} - -/** - * 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 = GFS2_I(odir); - struct gfs2_inode *ndip = GFS2_I(ndir); - struct gfs2_inode *ip = GFS2_I(odentry->d_inode); - struct gfs2_inode *nip = NULL; - struct gfs2_sbd *sdp = GFS2_SB(odir); - struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }, ri_gh; - struct gfs2_rgrpd *nrgd; - unsigned int num_gh; - int dir_rename = 0; - int alloc_required = 0; - unsigned int x; - int error; - - if (ndentry->d_inode) { - nip = GFS2_I(ndentry->d_inode); - if (ip == nip) - return 0; - } - - error = gfs2_rindex_hold(sdp, &ri_gh); - if (error) - return error; - - if (odip != ndip) { - error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, - 0, &r_gh); - if (error) - goto out; - - if (S_ISDIR(ip->i_inode.i_mode)) { - dir_rename = 1; - /* don't move a dirctory into it's subdir */ - error = gfs2_ok_to_move(ip, ndip); - if (error) - goto out_gunlock_r; - } - } - - num_gh = 1; - gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); - if (odip != ndip) { - gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); - num_gh++; - } - gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); - num_gh++; - - if (nip) { - gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); - num_gh++; - /* grab the resource lock for unlink flag twiddling - * this is the case of the target file already existing - * so we unlink before doing the rename - */ - nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr); - if (nrgd) - gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); - } - - for (x = 0; x < num_gh; x++) { - error = gfs2_glock_nq(ghs + x); - if (error) - goto out_gunlock; - } - - /* 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_inode.i_mode)) { - if (nip->i_entries < 2) { - if (gfs2_consist_inode(nip)) - gfs2_dinode_print(nip); - error = -EIO; - goto out_gunlock; - } - if (nip->i_entries > 2) { - error = -ENOTEMPTY; - goto out_gunlock; - } - } - } else { - error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); - if (error) - goto out_gunlock; - - error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); - switch (error) { - case -ENOENT: - error = 0; - break; - case 0: - error = -EEXIST; - default: - goto out_gunlock; - }; - - if (odip != ndip) { - if (!ndip->i_inode.i_nlink) { - error = -EINVAL; - goto out_gunlock; - } - if (ndip->i_entries == (u32)-1) { - error = -EFBIG; - goto out_gunlock; - } - if (S_ISDIR(ip->i_inode.i_mode) && - ndip->i_inode.i_nlink == (u32)-1) { - error = -EMLINK; - goto out_gunlock; - } - } - } - - /* Check out the dir to be renamed */ - - if (dir_rename) { - error = gfs2_permission(odentry->d_inode, MAY_WRITE); - if (error) - goto out_gunlock; - } - - if (nip == NULL) - alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name); - error = alloc_required; - if (error < 0) - goto out_gunlock; - error = 0; - - if (alloc_required) { - struct gfs2_alloc *al = gfs2_alloc_get(ndip); - if (!al) { - error = -ENOMEM; - goto out_gunlock; - } - - error = gfs2_quota_lock_check(ndip); - if (error) - goto out_alloc; - - al->al_requested = sdp->sd_max_dirres; - - error = gfs2_inplace_reserve_ri(ndip); - if (error) - goto out_gunlock_q; - - error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + - gfs2_rg_blocks(al) + - 4 * RES_DINODE + 4 * RES_LEAF + - RES_STATFS + RES_QUOTA + 4, 0); - if (error) - goto out_ipreserv; - } else { - error = gfs2_trans_begin(sdp, 4 * RES_DINODE + - 5 * RES_LEAF + 4, 0); - if (error) - goto out_gunlock; - } - - /* Remove the target file, if it exists */ - - if (nip) { - if (S_ISDIR(nip->i_inode.i_mode)) - error = gfs2_rmdiri(ndip, &ndentry->d_name, nip); - else { - error = gfs2_dir_del(ndip, &ndentry->d_name); - if (error) - goto out_end_trans; - error = gfs2_change_nlink(nip, -1); - } - if (error) - goto out_end_trans; - } - - if (dir_rename) { - 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, &gfs2_qdotdot, ndip, 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_inode.i_ctime = CURRENT_TIME; - gfs2_trans_add_bh(ip->i_gl, dibh, 1); - gfs2_dinode_out(ip, dibh->b_data); - brelse(dibh); - } - - error = gfs2_dir_del(odip, &odentry->d_name); - if (error) - goto out_end_trans; - - error = gfs2_dir_add(ndir, &ndentry->d_name, ip, IF2DT(ip->i_inode.i_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: - while (x--) { - gfs2_glock_dq(ghs + x); - gfs2_holder_uninit(ghs + x); - } -out_gunlock_r: - if (r_gh.gh_gl) - gfs2_glock_dq_uninit(&r_gh); -out: - gfs2_glock_dq_uninit(&ri_gh); - 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. - * - * Returns: 0 on success or error code - */ - -static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) -{ - struct gfs2_inode *ip = GFS2_I(dentry->d_inode); - struct gfs2_holder i_gh; - struct buffer_head *dibh; - unsigned int x, size; - char *buf; - int error; - - gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); - error = gfs2_glock_nq(&i_gh); - if (error) { - gfs2_holder_uninit(&i_gh); - nd_set_link(nd, ERR_PTR(error)); - return NULL; - } - - size = (unsigned int)i_size_read(&ip->i_inode); - if (size == 0) { - gfs2_consist_inode(ip); - buf = ERR_PTR(-EIO); - goto out; - } - - error = gfs2_meta_inode_buffer(ip, &dibh); - if (error) { - buf = ERR_PTR(error); - goto out; - } - - x = size + 1; - buf = kmalloc(x, GFP_NOFS); - if (!buf) - buf = ERR_PTR(-ENOMEM); - else - memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), x); - brelse(dibh); -out: - gfs2_glock_dq_uninit(&i_gh); - nd_set_link(nd, buf); - return NULL; -} - -static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p) -{ - char *s = nd_get_link(nd); - if (!IS_ERR(s)) - kfree(s); -} - -/** - * gfs2_permission - - * @inode: - * @mask: - * @nd: passed from Linux VFS, ignored by us - * - * This may be called from the VFS directly, or from within GFS2 with the - * inode locked, so we look to see if the glock is already locked and only - * lock the glock if its not already been done. - * - * Returns: errno - */ - -int gfs2_permission(struct inode *inode, int mask) -{ - struct gfs2_inode *ip = GFS2_I(inode); - struct gfs2_holder i_gh; - int error; - int unlock = 0; - - if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { - error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); - if (error) - return error; - unlock = 1; - } - - if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) - error = -EACCES; - else - error = generic_permission(inode, mask, gfs2_check_acl); - if (unlock) - gfs2_glock_dq_uninit(&i_gh); - - return error; -} - -static int setattr_chown(struct inode *inode, struct iattr *attr) -{ - struct gfs2_inode *ip = GFS2_I(inode); - struct gfs2_sbd *sdp = GFS2_SB(inode); - struct buffer_head *dibh; - u32 ouid, ogid, nuid, ngid; - int error; - - ouid = inode->i_uid; - ogid = inode->i_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; - - if (!gfs2_alloc_get(ip)) - return -ENOMEM; - - 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; - - if ((attr->ia_valid & ATTR_SIZE) && - attr->ia_size != i_size_read(inode)) { - int error; - - error = vmtruncate(inode, attr->ia_size); - gfs2_assert_warn(sdp, !error); - } - - setattr_copy(inode, attr); - mark_inode_dirty(inode); - - gfs2_trans_add_bh(ip->i_gl, dibh, 1); - gfs2_dinode_out(ip, dibh->b_data); - brelse(dibh); - - if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { - u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); - gfs2_quota_change(ip, -blocks, ouid, ogid); - gfs2_quota_change(ip, 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 = GFS2_I(inode); - struct gfs2_holder i_gh; - int error; - - 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 = gfs2_setattr_size(inode, attr->ia_size); - 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: The vfsmount the inode is being accessed from - * @dentry: The dentry to stat - * @stat: The inode's stats - * - * This may be called from the VFS directly, or from within GFS2 with the - * inode locked, so we look to see if the glock is already locked and only - * lock the glock if its not already been done. Note that its the NFS - * readdirplus operation which causes this to be called (from filldir) - * with the glock already held. - * - * 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 = GFS2_I(inode); - struct gfs2_holder gh; - int error; - int unlock = 0; - - if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { - error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); - if (error) - return error; - unlock = 1; - } - - generic_fillattr(inode, stat); - if (unlock) - gfs2_glock_dq_uninit(&gh); - - return 0; -} - -static int gfs2_setxattr(struct dentry *dentry, const char *name, - const void *data, size_t size, int flags) -{ - struct inode *inode = dentry->d_inode; - struct gfs2_inode *ip = GFS2_I(inode); - struct gfs2_holder gh; - int ret; - - gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); - ret = gfs2_glock_nq(&gh); - if (ret == 0) { - ret = generic_setxattr(dentry, name, data, size, flags); - gfs2_glock_dq(&gh); - } - gfs2_holder_uninit(&gh); - return ret; -} - -static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, - void *data, size_t size) -{ - struct inode *inode = dentry->d_inode; - struct gfs2_inode *ip = GFS2_I(inode); - struct gfs2_holder gh; - int ret; - - gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); - ret = gfs2_glock_nq(&gh); - if (ret == 0) { - ret = generic_getxattr(dentry, name, data, size); - gfs2_glock_dq(&gh); - } - gfs2_holder_uninit(&gh); - return ret; -} - -static int gfs2_removexattr(struct dentry *dentry, const char *name) -{ - struct inode *inode = dentry->d_inode; - struct gfs2_inode *ip = GFS2_I(inode); - struct gfs2_holder gh; - int ret; - - gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); - ret = gfs2_glock_nq(&gh); - if (ret == 0) { - ret = generic_removexattr(dentry, name); - gfs2_glock_dq(&gh); - } - gfs2_holder_uninit(&gh); - return ret; -} - -static void empty_write_end(struct page *page, unsigned from, - unsigned to) -{ - struct gfs2_inode *ip = GFS2_I(page->mapping->host); - - page_zero_new_buffers(page, from, to); - flush_dcache_page(page); - mark_page_accessed(page); - - if (!gfs2_is_writeback(ip)) - gfs2_page_add_databufs(ip, page, from, to); - - block_commit_write(page, from, to); -} - - -static int write_empty_blocks(struct page *page, unsigned from, unsigned to) -{ - unsigned start, end, next; - struct buffer_head *bh, *head; - int error; - - if (!page_has_buffers(page)) { - error = __block_write_begin(page, from, to - from, gfs2_block_map); - if (unlikely(error)) - return error; - - empty_write_end(page, from, to); - return 0; - } - - bh = head = page_buffers(page); - next = end = 0; - while (next < from) { - next += bh->b_size; - bh = bh->b_this_page; - } - start = next; - do { - next += bh->b_size; - if (buffer_mapped(bh)) { - if (end) { - error = __block_write_begin(page, start, end - start, - gfs2_block_map); - if (unlikely(error)) - return error; - empty_write_end(page, start, end); - end = 0; - } - start = next; - } - else - end = next; - bh = bh->b_this_page; - } while (next < to); - - if (end) { - error = __block_write_begin(page, start, end - start, gfs2_block_map); - if (unlikely(error)) - return error; - empty_write_end(page, start, end); - } - - return 0; -} - -static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len, - int mode) -{ - struct gfs2_inode *ip = GFS2_I(inode); - struct buffer_head *dibh; - int error; - u64 start = offset >> PAGE_CACHE_SHIFT; - unsigned int start_offset = offset & ~PAGE_CACHE_MASK; - u64 end = (offset + len - 1) >> PAGE_CACHE_SHIFT; - pgoff_t curr; - struct page *page; - unsigned int end_offset = (offset + len) & ~PAGE_CACHE_MASK; - unsigned int from, to; - - if (!end_offset) - end_offset = PAGE_CACHE_SIZE; - - error = gfs2_meta_inode_buffer(ip, &dibh); - if (unlikely(error)) - goto out; - - gfs2_trans_add_bh(ip->i_gl, dibh, 1); - - if (gfs2_is_stuffed(ip)) { - error = gfs2_unstuff_dinode(ip, NULL); - if (unlikely(error)) - goto out; - } - - curr = start; - offset = start << PAGE_CACHE_SHIFT; - from = start_offset; - to = PAGE_CACHE_SIZE; - while (curr <= end) { - page = grab_cache_page_write_begin(inode->i_mapping, curr, - AOP_FLAG_NOFS); - if (unlikely(!page)) { - error = -ENOMEM; - goto out; - } - - if (curr == end) - to = end_offset; - error = write_empty_blocks(page, from, to); - if (!error && offset + to > inode->i_size && - !(mode & FALLOC_FL_KEEP_SIZE)) { - i_size_write(inode, offset + to); - } - unlock_page(page); - page_cache_release(page); - if (error) - goto out; - curr++; - offset += PAGE_CACHE_SIZE; - from = 0; - } - - gfs2_dinode_out(ip, dibh->b_data); - mark_inode_dirty(inode); - - brelse(dibh); - -out: - return error; -} - -static void calc_max_reserv(struct gfs2_inode *ip, loff_t max, loff_t *len, - unsigned int *data_blocks, unsigned int *ind_blocks) -{ - const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); - unsigned int max_blocks = ip->i_alloc->al_rgd->rd_free_clone; - unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1); - - for (tmp = max_data; tmp > sdp->sd_diptrs;) { - tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs); - max_data -= tmp; - } - /* This calculation isn't the exact reverse of gfs2_write_calc_reserve, - so it might end up with fewer data blocks */ - if (max_data <= *data_blocks) - return; - *data_blocks = max_data; - *ind_blocks = max_blocks - max_data; - *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift; - if (*len > max) { - *len = max; - gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks); - } -} - -static long gfs2_fallocate(struct inode *inode, int mode, loff_t offset, - loff_t len) -{ - struct gfs2_sbd *sdp = GFS2_SB(inode); - struct gfs2_inode *ip = GFS2_I(inode); - unsigned int data_blocks = 0, ind_blocks = 0, rblocks; - loff_t bytes, max_bytes; - struct gfs2_alloc *al; - int error; - loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift; - next = (next + 1) << sdp->sd_sb.sb_bsize_shift; - - offset = (offset >> sdp->sd_sb.sb_bsize_shift) << - sdp->sd_sb.sb_bsize_shift; - - len = next - offset; - bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2; - if (!bytes) - bytes = UINT_MAX; - - gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh); - error = gfs2_glock_nq(&ip->i_gh); - if (unlikely(error)) - goto out_uninit; - - if (!gfs2_write_alloc_required(ip, offset, len)) - goto out_unlock; - - while (len > 0) { - if (len < bytes) - bytes = len; - al = gfs2_alloc_get(ip); - if (!al) { - error = -ENOMEM; - goto out_unlock; - } - - error = gfs2_quota_lock_check(ip); - if (error) - goto out_alloc_put; - -retry: - gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks); - - al->al_requested = data_blocks + ind_blocks; - error = gfs2_inplace_reserve(ip); - if (error) { - if (error == -ENOSPC && bytes > sdp->sd_sb.sb_bsize) { - bytes >>= 1; - goto retry; - } - goto out_qunlock; - } - max_bytes = bytes; - calc_max_reserv(ip, len, &max_bytes, &data_blocks, &ind_blocks); - al->al_requested = data_blocks + ind_blocks; - - rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA + - RES_RG_HDR + gfs2_rg_blocks(al); - if (gfs2_is_jdata(ip)) - rblocks += data_blocks ? data_blocks : 1; - - error = gfs2_trans_begin(sdp, rblocks, - PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize); - if (error) - goto out_trans_fail; - - error = fallocate_chunk(inode, offset, max_bytes, mode); - gfs2_trans_end(sdp); - - if (error) - goto out_trans_fail; - - len -= max_bytes; - offset += max_bytes; - gfs2_inplace_release(ip); - gfs2_quota_unlock(ip); - gfs2_alloc_put(ip); - } - goto out_unlock; - -out_trans_fail: - gfs2_inplace_release(ip); -out_qunlock: - gfs2_quota_unlock(ip); -out_alloc_put: - gfs2_alloc_put(ip); -out_unlock: - gfs2_glock_dq(&ip->i_gh); -out_uninit: - gfs2_holder_uninit(&ip->i_gh); - return error; -} - - -static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, - u64 start, u64 len) -{ - struct gfs2_inode *ip = GFS2_I(inode); - struct gfs2_holder gh; - int ret; - - ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); - if (ret) - return ret; - - mutex_lock(&inode->i_mutex); - - ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); - if (ret) - goto out; - - if (gfs2_is_stuffed(ip)) { - u64 phys = ip->i_no_addr << inode->i_blkbits; - u64 size = i_size_read(inode); - u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| - FIEMAP_EXTENT_DATA_INLINE; - phys += sizeof(struct gfs2_dinode); - phys += start; - if (start + len > size) - len = size - start; - if (start < size) - ret = fiemap_fill_next_extent(fieinfo, start, phys, - len, flags); - if (ret == 1) - ret = 0; - } else { - ret = __generic_block_fiemap(inode, fieinfo, start, len, - gfs2_block_map); - } - - gfs2_glock_dq_uninit(&gh); -out: - mutex_unlock(&inode->i_mutex); - return ret; -} - -const 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, - .fallocate = gfs2_fallocate, - .fiemap = gfs2_fiemap, -}; - -const 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, - .fiemap = gfs2_fiemap, -}; - -const struct inode_operations gfs2_symlink_iops = { - .readlink = generic_readlink, - .follow_link = gfs2_follow_link, - .put_link = gfs2_put_link, - .permission = gfs2_permission, - .setattr = gfs2_setattr, - .getattr = gfs2_getattr, - .setxattr = gfs2_setxattr, - .getxattr = gfs2_getxattr, - .listxattr = gfs2_listxattr, - .removexattr = gfs2_removexattr, - .fiemap = gfs2_fiemap, -}; - |