![Linus Torvalds](/assets/img/avatar_default.png)
* git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-3.0-nmw: GFS2: local functions should be static GFS2: We only need one ACL getting function GFS2: Fix multi-block allocation GFS2: decouple quota allocations from block allocations GFS2: split function rgblk_search GFS2: Fix up "off by one" in the previous patch GFS2: move toward a generic multi-block allocator GFS2: O_(D)SYNC support for fallocate GFS2: remove vestigial al_alloced GFS2: combine gfs2_alloc_block and gfs2_alloc_di GFS2: Add non-try locks back to get_local_rgrp GFS2: f_ra is always valid in dir readahead function GFS2: Fix very unlikley memory leak in ACL xattr code GFS2: More automated code analysis fixes GFS2: Add readahead to sequential directory traversal GFS2: Fix up REQ flags
1852 lines
43 KiB
C
1852 lines
43 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/namei.h>
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#include <linux/mm.h>
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#include <linux/xattr.h>
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#include <linux/posix_acl.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/crc32.h>
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#include <linux/fiemap.h>
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#include <linux/security.h>
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#include <asm/uaccess.h>
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#include "gfs2.h"
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#include "incore.h"
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#include "acl.h"
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#include "bmap.h"
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#include "dir.h"
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#include "xattr.h"
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#include "glock.h"
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#include "inode.h"
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#include "meta_io.h"
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#include "quota.h"
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#include "rgrp.h"
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#include "trans.h"
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#include "util.h"
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#include "super.h"
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#include "glops.h"
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struct gfs2_skip_data {
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u64 no_addr;
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int skipped;
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int non_block;
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};
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static int iget_test(struct inode *inode, void *opaque)
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{
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_skip_data *data = opaque;
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if (ip->i_no_addr == data->no_addr) {
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if (data->non_block &&
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inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) {
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data->skipped = 1;
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return 0;
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}
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return 1;
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}
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return 0;
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}
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static int iget_set(struct inode *inode, void *opaque)
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{
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_skip_data *data = opaque;
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if (data->skipped)
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return -ENOENT;
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inode->i_ino = (unsigned long)(data->no_addr);
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ip->i_no_addr = data->no_addr;
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return 0;
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}
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struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block)
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{
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unsigned long hash = (unsigned long)no_addr;
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struct gfs2_skip_data data;
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data.no_addr = no_addr;
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data.skipped = 0;
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data.non_block = non_block;
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return ilookup5(sb, hash, iget_test, &data);
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}
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static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr,
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int non_block)
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{
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struct gfs2_skip_data data;
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unsigned long hash = (unsigned long)no_addr;
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data.no_addr = no_addr;
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data.skipped = 0;
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data.non_block = non_block;
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return iget5_locked(sb, hash, iget_test, iget_set, &data);
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}
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/**
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* gfs2_set_iop - Sets inode operations
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* @inode: The inode with correct i_mode filled in
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*
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* GFS2 lookup code fills in vfs inode contents based on info obtained
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* from directory entry inside gfs2_inode_lookup().
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*/
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static void gfs2_set_iop(struct inode *inode)
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{
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struct gfs2_sbd *sdp = GFS2_SB(inode);
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umode_t mode = inode->i_mode;
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if (S_ISREG(mode)) {
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inode->i_op = &gfs2_file_iops;
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if (gfs2_localflocks(sdp))
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inode->i_fop = &gfs2_file_fops_nolock;
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else
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inode->i_fop = &gfs2_file_fops;
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} else if (S_ISDIR(mode)) {
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inode->i_op = &gfs2_dir_iops;
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if (gfs2_localflocks(sdp))
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inode->i_fop = &gfs2_dir_fops_nolock;
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else
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inode->i_fop = &gfs2_dir_fops;
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} else if (S_ISLNK(mode)) {
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inode->i_op = &gfs2_symlink_iops;
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} else {
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inode->i_op = &gfs2_file_iops;
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init_special_inode(inode, inode->i_mode, inode->i_rdev);
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}
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}
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/**
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* gfs2_inode_lookup - Lookup an inode
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* @sb: The super block
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* @no_addr: The inode number
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* @type: The type of the inode
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* non_block: Can we block on inodes that are being freed?
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*
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* Returns: A VFS inode, or an error
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*/
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struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
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u64 no_addr, u64 no_formal_ino, int non_block)
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{
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struct inode *inode;
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struct gfs2_inode *ip;
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struct gfs2_glock *io_gl = NULL;
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int error;
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inode = gfs2_iget(sb, no_addr, non_block);
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ip = GFS2_I(inode);
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if (!inode)
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return ERR_PTR(-ENOBUFS);
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if (inode->i_state & I_NEW) {
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struct gfs2_sbd *sdp = GFS2_SB(inode);
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ip->i_no_formal_ino = no_formal_ino;
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error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
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if (unlikely(error))
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goto fail;
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ip->i_gl->gl_object = ip;
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error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
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if (unlikely(error))
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goto fail_put;
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set_bit(GIF_INVALID, &ip->i_flags);
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error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
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if (unlikely(error))
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goto fail_iopen;
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ip->i_iopen_gh.gh_gl->gl_object = ip;
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gfs2_glock_put(io_gl);
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io_gl = NULL;
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if (type == DT_UNKNOWN) {
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/* Inode glock must be locked already */
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error = gfs2_inode_refresh(GFS2_I(inode));
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if (error)
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goto fail_refresh;
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} else {
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inode->i_mode = DT2IF(type);
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}
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gfs2_set_iop(inode);
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unlock_new_inode(inode);
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}
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return inode;
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fail_refresh:
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ip->i_iopen_gh.gh_gl->gl_object = NULL;
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gfs2_glock_dq_uninit(&ip->i_iopen_gh);
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fail_iopen:
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if (io_gl)
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gfs2_glock_put(io_gl);
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fail_put:
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ip->i_gl->gl_object = NULL;
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gfs2_glock_put(ip->i_gl);
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fail:
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iget_failed(inode);
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return ERR_PTR(error);
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}
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struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
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u64 *no_formal_ino, unsigned int blktype)
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{
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struct super_block *sb = sdp->sd_vfs;
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struct gfs2_holder i_gh;
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struct inode *inode = NULL;
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int error;
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/* Must not read in block until block type is verified */
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error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
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LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
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if (error)
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return ERR_PTR(error);
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error = gfs2_check_blk_type(sdp, no_addr, blktype);
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if (error)
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goto fail;
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inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1);
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if (IS_ERR(inode))
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goto fail;
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/* Two extra checks for NFS only */
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if (no_formal_ino) {
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error = -ESTALE;
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if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
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goto fail_iput;
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error = -EIO;
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if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
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goto fail_iput;
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error = 0;
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}
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fail:
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gfs2_glock_dq_uninit(&i_gh);
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return error ? ERR_PTR(error) : inode;
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fail_iput:
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iput(inode);
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goto fail;
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}
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struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
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{
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struct qstr qstr;
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struct inode *inode;
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gfs2_str2qstr(&qstr, name);
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inode = gfs2_lookupi(dip, &qstr, 1);
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/* gfs2_lookupi has inconsistent callers: vfs
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* related routines expect NULL for no entry found,
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* gfs2_lookup_simple callers expect ENOENT
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* and do not check for NULL.
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*/
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if (inode == NULL)
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return ERR_PTR(-ENOENT);
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else
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return inode;
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}
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/**
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* gfs2_lookupi - Look up a filename in a directory and return its inode
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* @d_gh: An initialized holder for the directory glock
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* @name: The name of the inode to look for
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* @is_root: If 1, ignore the caller's permissions
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* @i_gh: An uninitialized holder for the new inode glock
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*
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* This can be called via the VFS filldir function when NFS is doing
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* a readdirplus and the inode which its intending to stat isn't
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* already in cache. In this case we must not take the directory glock
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* again, since the readdir call will have already taken that lock.
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*
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* Returns: errno
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*/
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struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
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int is_root)
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{
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struct super_block *sb = dir->i_sb;
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struct gfs2_inode *dip = GFS2_I(dir);
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struct gfs2_holder d_gh;
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int error = 0;
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struct inode *inode = NULL;
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int unlock = 0;
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if (!name->len || name->len > GFS2_FNAMESIZE)
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return ERR_PTR(-ENAMETOOLONG);
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if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
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(name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
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dir == sb->s_root->d_inode)) {
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igrab(dir);
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return dir;
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}
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if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
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error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
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if (error)
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return ERR_PTR(error);
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unlock = 1;
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}
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if (!is_root) {
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error = gfs2_permission(dir, MAY_EXEC);
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if (error)
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goto out;
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}
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inode = gfs2_dir_search(dir, name);
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if (IS_ERR(inode))
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error = PTR_ERR(inode);
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out:
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if (unlock)
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gfs2_glock_dq_uninit(&d_gh);
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if (error == -ENOENT)
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return NULL;
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return inode ? inode : ERR_PTR(error);
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}
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/**
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* create_ok - OK to create a new on-disk inode here?
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* @dip: Directory in which dinode is to be created
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* @name: Name of new dinode
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* @mode:
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*
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* Returns: errno
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*/
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static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
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umode_t mode)
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{
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int error;
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error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
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if (error)
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return error;
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/* Don't create entries in an unlinked directory */
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if (!dip->i_inode.i_nlink)
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return -ENOENT;
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error = gfs2_dir_check(&dip->i_inode, name, NULL);
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switch (error) {
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case -ENOENT:
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error = 0;
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break;
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case 0:
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return -EEXIST;
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default:
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return error;
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}
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if (dip->i_entries == (u32)-1)
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return -EFBIG;
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if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
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return -EMLINK;
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return 0;
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}
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static void munge_mode_uid_gid(struct gfs2_inode *dip, umode_t *mode,
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unsigned int *uid, unsigned int *gid)
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{
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if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
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(dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
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if (S_ISDIR(*mode))
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*mode |= S_ISUID;
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else if (dip->i_inode.i_uid != current_fsuid())
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*mode &= ~07111;
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*uid = dip->i_inode.i_uid;
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} else
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*uid = current_fsuid();
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if (dip->i_inode.i_mode & S_ISGID) {
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if (S_ISDIR(*mode))
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*mode |= S_ISGID;
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*gid = dip->i_inode.i_gid;
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} else
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*gid = current_fsgid();
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}
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static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
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{
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struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
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int error;
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int dblocks = 1;
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error = gfs2_rindex_update(sdp);
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if (error)
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fs_warn(sdp, "rindex update returns %d\n", error);
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error = gfs2_inplace_reserve(dip, RES_DINODE);
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if (error)
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goto out;
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error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
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if (error)
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goto out_ipreserv;
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error = gfs2_alloc_blocks(dip, no_addr, &dblocks, 1, generation);
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|
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gfs2_trans_end(sdp);
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out_ipreserv:
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gfs2_inplace_release(dip);
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out:
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return error;
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}
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|
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static void gfs2_init_dir(struct buffer_head *dibh,
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const struct gfs2_inode *parent)
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{
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struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
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struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
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gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
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dent->de_inum = di->di_num; /* already GFS2 endian */
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dent->de_type = cpu_to_be16(DT_DIR);
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dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
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gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
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gfs2_inum_out(parent, dent);
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dent->de_type = cpu_to_be16(DT_DIR);
|
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|
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}
|
|
|
|
/**
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* init_dinode - Fill in a new dinode structure
|
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* @dip: The directory this inode is being created in
|
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* @gl: The glock covering the new inode
|
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* @inum: The inode number
|
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* @mode: The file permissions
|
|
* @uid: The uid of the new inode
|
|
* @gid: The gid of the new inode
|
|
* @generation: The generation number of the new inode
|
|
* @dev: The device number (if a device node)
|
|
* @symname: The symlink destination (if a symlink)
|
|
* @size: The inode size (ignored for directories)
|
|
* @bhp: The buffer head (returned to caller)
|
|
*
|
|
*/
|
|
|
|
static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
|
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const struct gfs2_inum_host *inum, umode_t mode,
|
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unsigned int uid, unsigned int gid,
|
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const u64 *generation, dev_t dev, const char *symname,
|
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unsigned size, struct buffer_head **bhp)
|
|
{
|
|
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
|
|
struct gfs2_dinode *di;
|
|
struct buffer_head *dibh;
|
|
struct timespec tv = CURRENT_TIME;
|
|
|
|
dibh = gfs2_meta_new(gl, inum->no_addr);
|
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gfs2_trans_add_bh(gl, dibh, 1);
|
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gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
|
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gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
|
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di = (struct gfs2_dinode *)dibh->b_data;
|
|
|
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di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
|
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di->di_num.no_addr = cpu_to_be64(inum->no_addr);
|
|
di->di_mode = cpu_to_be32(mode);
|
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di->di_uid = cpu_to_be32(uid);
|
|
di->di_gid = cpu_to_be32(gid);
|
|
di->di_nlink = 0;
|
|
di->di_size = cpu_to_be64(size);
|
|
di->di_blocks = cpu_to_be64(1);
|
|
di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec);
|
|
di->di_major = cpu_to_be32(MAJOR(dev));
|
|
di->di_minor = cpu_to_be32(MINOR(dev));
|
|
di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
|
|
di->di_generation = cpu_to_be64(*generation);
|
|
di->di_flags = 0;
|
|
di->__pad1 = 0;
|
|
di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0);
|
|
di->di_height = 0;
|
|
di->__pad2 = 0;
|
|
di->__pad3 = 0;
|
|
di->di_depth = 0;
|
|
di->di_entries = 0;
|
|
memset(&di->__pad4, 0, sizeof(di->__pad4));
|
|
di->di_eattr = 0;
|
|
di->di_atime_nsec = cpu_to_be32(tv.tv_nsec);
|
|
di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec);
|
|
di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec);
|
|
memset(&di->di_reserved, 0, sizeof(di->di_reserved));
|
|
|
|
switch(mode & S_IFMT) {
|
|
case S_IFREG:
|
|
if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
|
|
gfs2_tune_get(sdp, gt_new_files_jdata))
|
|
di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
|
|
break;
|
|
case S_IFDIR:
|
|
di->di_flags |= cpu_to_be32(dip->i_diskflags &
|
|
GFS2_DIF_INHERIT_JDATA);
|
|
di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
|
|
di->di_size = cpu_to_be64(sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode));
|
|
di->di_entries = cpu_to_be32(2);
|
|
gfs2_init_dir(dibh, dip);
|
|
break;
|
|
case S_IFLNK:
|
|
memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, size);
|
|
break;
|
|
}
|
|
|
|
set_buffer_uptodate(dibh);
|
|
|
|
*bhp = dibh;
|
|
}
|
|
|
|
static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
|
|
umode_t mode, const struct gfs2_inum_host *inum,
|
|
const u64 *generation, dev_t dev, const char *symname,
|
|
unsigned int size, struct buffer_head **bhp)
|
|
{
|
|
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
|
|
unsigned int uid, gid;
|
|
int error;
|
|
|
|
munge_mode_uid_gid(dip, &mode, &uid, &gid);
|
|
if (!gfs2_qadata_get(dip))
|
|
return -ENOMEM;
|
|
|
|
error = gfs2_quota_lock(dip, uid, gid);
|
|
if (error)
|
|
goto out;
|
|
|
|
error = gfs2_quota_check(dip, uid, gid);
|
|
if (error)
|
|
goto out_quota;
|
|
|
|
error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
|
|
if (error)
|
|
goto out_quota;
|
|
|
|
init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, symname, size, bhp);
|
|
gfs2_quota_change(dip, +1, uid, gid);
|
|
gfs2_trans_end(sdp);
|
|
|
|
out_quota:
|
|
gfs2_quota_unlock(dip);
|
|
out:
|
|
gfs2_qadata_put(dip);
|
|
return error;
|
|
}
|
|
|
|
static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
|
|
struct gfs2_inode *ip)
|
|
{
|
|
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
|
|
struct gfs2_qadata *qa;
|
|
int alloc_required;
|
|
struct buffer_head *dibh;
|
|
int error;
|
|
|
|
qa = gfs2_qadata_get(dip);
|
|
if (!qa)
|
|
return -ENOMEM;
|
|
|
|
error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
|
|
if (error)
|
|
goto fail;
|
|
|
|
error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
|
|
if (alloc_required < 0)
|
|
goto fail_quota_locks;
|
|
if (alloc_required) {
|
|
error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
|
|
if (error)
|
|
goto fail_quota_locks;
|
|
|
|
error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres);
|
|
if (error)
|
|
goto fail_quota_locks;
|
|
|
|
error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
|
|
dip->i_rgd->rd_length +
|
|
2 * RES_DINODE +
|
|
RES_STATFS + RES_QUOTA, 0);
|
|
if (error)
|
|
goto fail_ipreserv;
|
|
} else {
|
|
error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
|
|
if (error)
|
|
goto fail_quota_locks;
|
|
}
|
|
|
|
error = gfs2_dir_add(&dip->i_inode, name, ip);
|
|
if (error)
|
|
goto fail_end_trans;
|
|
|
|
error = gfs2_meta_inode_buffer(ip, &dibh);
|
|
if (error)
|
|
goto fail_end_trans;
|
|
inc_nlink(&ip->i_inode);
|
|
if (S_ISDIR(ip->i_inode.i_mode))
|
|
inc_nlink(&ip->i_inode);
|
|
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
|
|
gfs2_dinode_out(ip, dibh->b_data);
|
|
brelse(dibh);
|
|
return 0;
|
|
|
|
fail_end_trans:
|
|
gfs2_trans_end(sdp);
|
|
|
|
fail_ipreserv:
|
|
gfs2_inplace_release(dip);
|
|
|
|
fail_quota_locks:
|
|
gfs2_quota_unlock(dip);
|
|
|
|
fail:
|
|
gfs2_qadata_put(dip);
|
|
return error;
|
|
}
|
|
|
|
static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
|
|
void *fs_info)
|
|
{
|
|
const struct xattr *xattr;
|
|
int err = 0;
|
|
|
|
for (xattr = xattr_array; xattr->name != NULL; xattr++) {
|
|
err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
|
|
xattr->value_len, 0,
|
|
GFS2_EATYPE_SECURITY);
|
|
if (err < 0)
|
|
break;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
|
|
const struct qstr *qstr)
|
|
{
|
|
return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
|
|
&gfs2_initxattrs, NULL);
|
|
}
|
|
|
|
/**
|
|
* gfs2_create_inode - Create a new inode
|
|
* @dir: The parent directory
|
|
* @dentry: The new dentry
|
|
* @mode: The permissions on the new inode
|
|
* @dev: For device nodes, this is the device number
|
|
* @symname: For symlinks, this is the link destination
|
|
* @size: The initial size of the inode (ignored for directories)
|
|
*
|
|
* Returns: 0 on success, or error code
|
|
*/
|
|
|
|
static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
|
|
umode_t mode, dev_t dev, const char *symname,
|
|
unsigned int size, int excl)
|
|
{
|
|
const struct qstr *name = &dentry->d_name;
|
|
struct gfs2_holder ghs[2];
|
|
struct inode *inode = NULL;
|
|
struct gfs2_inode *dip = GFS2_I(dir);
|
|
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
|
|
struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
|
|
int error;
|
|
u64 generation;
|
|
struct buffer_head *bh = NULL;
|
|
|
|
if (!name->len || name->len > GFS2_FNAMESIZE)
|
|
return -ENAMETOOLONG;
|
|
|
|
error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
|
|
if (error)
|
|
goto fail;
|
|
|
|
error = create_ok(dip, name, mode);
|
|
if ((error == -EEXIST) && S_ISREG(mode) && !excl) {
|
|
inode = gfs2_lookupi(dir, &dentry->d_name, 0);
|
|
gfs2_glock_dq_uninit(ghs);
|
|
d_instantiate(dentry, inode);
|
|
return IS_ERR(inode) ? PTR_ERR(inode) : 0;
|
|
}
|
|
if (error)
|
|
goto fail_gunlock;
|
|
|
|
error = alloc_dinode(dip, &inum.no_addr, &generation);
|
|
if (error)
|
|
goto fail_gunlock;
|
|
inum.no_formal_ino = generation;
|
|
|
|
error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
|
|
LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
|
|
if (error)
|
|
goto fail_gunlock;
|
|
|
|
error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, symname, size, &bh);
|
|
if (error)
|
|
goto fail_gunlock2;
|
|
|
|
inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr,
|
|
inum.no_formal_ino, 0);
|
|
if (IS_ERR(inode))
|
|
goto fail_gunlock2;
|
|
|
|
error = gfs2_inode_refresh(GFS2_I(inode));
|
|
if (error)
|
|
goto fail_gunlock2;
|
|
|
|
error = gfs2_acl_create(dip, inode);
|
|
if (error)
|
|
goto fail_gunlock2;
|
|
|
|
error = gfs2_security_init(dip, GFS2_I(inode), name);
|
|
if (error)
|
|
goto fail_gunlock2;
|
|
|
|
error = link_dinode(dip, name, GFS2_I(inode));
|
|
if (error)
|
|
goto fail_gunlock2;
|
|
|
|
if (bh)
|
|
brelse(bh);
|
|
|
|
gfs2_trans_end(sdp);
|
|
/* Check if we reserved space in the rgrp. Function link_dinode may
|
|
not, depending on whether alloc is required. */
|
|
if (dip->i_res)
|
|
gfs2_inplace_release(dip);
|
|
gfs2_quota_unlock(dip);
|
|
gfs2_qadata_put(dip);
|
|
mark_inode_dirty(inode);
|
|
gfs2_glock_dq_uninit_m(2, ghs);
|
|
d_instantiate(dentry, inode);
|
|
return 0;
|
|
|
|
fail_gunlock2:
|
|
gfs2_glock_dq_uninit(ghs + 1);
|
|
fail_gunlock:
|
|
gfs2_glock_dq_uninit(ghs);
|
|
if (inode && !IS_ERR(inode)) {
|
|
set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags);
|
|
iput(inode);
|
|
}
|
|
fail:
|
|
if (bh)
|
|
brelse(bh);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* 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,
|
|
umode_t mode, struct nameidata *nd)
|
|
{
|
|
int excl = 0;
|
|
if (nd && (nd->flags & LOOKUP_EXCL))
|
|
excl = 1;
|
|
return gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0, excl);
|
|
}
|
|
|
|
/**
|
|
* 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 = gfs2_lookupi(dir, &dentry->d_name, 0);
|
|
if (inode && !IS_ERR(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);
|
|
}
|
|
|
|
/**
|
|
* 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];
|
|
struct buffer_head *dibh;
|
|
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 = -ENOENT;
|
|
if (inode->i_nlink == 0)
|
|
goto out_gunlock;
|
|
|
|
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_qadata *qa = gfs2_qadata_get(dip);
|
|
|
|
if (!qa) {
|
|
error = -ENOMEM;
|
|
goto out_gunlock;
|
|
}
|
|
|
|
error = gfs2_quota_lock_check(dip);
|
|
if (error)
|
|
goto out_alloc;
|
|
|
|
error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres);
|
|
if (error)
|
|
goto out_gunlock_q;
|
|
|
|
error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
|
|
gfs2_rg_blocks(dip) +
|
|
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_meta_inode_buffer(ip, &dibh);
|
|
if (error)
|
|
goto out_end_trans;
|
|
|
|
error = gfs2_dir_add(dir, &dentry->d_name, ip);
|
|
if (error)
|
|
goto out_brelse;
|
|
|
|
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
|
|
inc_nlink(&ip->i_inode);
|
|
ip->i_inode.i_ctime = CURRENT_TIME;
|
|
ihold(inode);
|
|
d_instantiate(dentry, inode);
|
|
mark_inode_dirty(inode);
|
|
|
|
out_brelse:
|
|
brelse(dibh);
|
|
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_qadata_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);
|
|
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_inode - Removes an inode from its parent dir and unlinks it
|
|
* @dip: The parent directory
|
|
* @name: The name of the entry in the parent directory
|
|
* @bh: The inode buffer for the inode to be removed
|
|
* @inode: The inode to be removed
|
|
*
|
|
* Called with all the locks and in a transaction. This will only be
|
|
* called for a directory after it has been checked to ensure it is empty.
|
|
*
|
|
* Returns: 0 on success, or an error
|
|
*/
|
|
|
|
static int gfs2_unlink_inode(struct gfs2_inode *dip,
|
|
const struct dentry *dentry,
|
|
struct buffer_head *bh)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
int error;
|
|
|
|
error = gfs2_dir_del(dip, dentry);
|
|
if (error)
|
|
return error;
|
|
|
|
ip->i_entries = 0;
|
|
inode->i_ctime = CURRENT_TIME;
|
|
if (S_ISDIR(inode->i_mode))
|
|
clear_nlink(inode);
|
|
else
|
|
drop_nlink(inode);
|
|
mark_inode_dirty(inode);
|
|
if (inode->i_nlink == 0)
|
|
gfs2_unlink_di(inode);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* gfs2_unlink - Unlink an inode (this does rmdir as well)
|
|
* @dir: The inode of the directory containing the inode to unlink
|
|
* @dentry: The file itself
|
|
*
|
|
* This routine uses the type of the inode as a flag to figure out
|
|
* whether this is an unlink or an rmdir.
|
|
*
|
|
* 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 inode *inode = dentry->d_inode;
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct buffer_head *bh;
|
|
struct gfs2_holder ghs[3];
|
|
struct gfs2_rgrpd *rgd;
|
|
int error = -EROFS;
|
|
|
|
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);
|
|
if (!rgd)
|
|
goto out_inodes;
|
|
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 = -ENOENT;
|
|
if (inode->i_nlink == 0)
|
|
goto out_rgrp;
|
|
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
error = -ENOTEMPTY;
|
|
if (ip->i_entries > 2 || inode->i_nlink > 2)
|
|
goto out_rgrp;
|
|
}
|
|
|
|
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 + 3*RES_LEAF + RES_RG_BIT, 0);
|
|
if (error)
|
|
goto out_gunlock;
|
|
|
|
error = gfs2_meta_inode_buffer(ip, &bh);
|
|
if (error)
|
|
goto out_end_trans;
|
|
|
|
error = gfs2_unlink_inode(dip, dentry, bh);
|
|
brelse(bh);
|
|
|
|
out_end_trans:
|
|
gfs2_trans_end(sdp);
|
|
out_gunlock:
|
|
gfs2_glock_dq(ghs + 2);
|
|
out_rgrp:
|
|
gfs2_glock_dq(ghs + 1);
|
|
out_child:
|
|
gfs2_glock_dq(ghs);
|
|
out_parent:
|
|
gfs2_holder_uninit(ghs + 2);
|
|
out_inodes:
|
|
gfs2_holder_uninit(ghs + 1);
|
|
gfs2_holder_uninit(ghs);
|
|
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_sbd *sdp = GFS2_SB(dir);
|
|
unsigned int size;
|
|
|
|
size = strlen(symname);
|
|
if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
|
|
return -ENAMETOOLONG;
|
|
|
|
return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size, 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, umode_t mode)
|
|
{
|
|
return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, 0, 0);
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
* @dev: The device specification of the special file
|
|
*
|
|
*/
|
|
|
|
static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
|
|
dev_t dev)
|
|
{
|
|
return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0, 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, };
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
error = -ENOENT;
|
|
if (ip->i_inode.i_nlink == 0)
|
|
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 (nip->i_inode.i_nlink == 0) {
|
|
error = -EAGAIN;
|
|
goto out_gunlock;
|
|
}
|
|
|
|
if (S_ISDIR(nip->i_inode.i_mode)) {
|
|
if (nip->i_entries < 2) {
|
|
gfs2_consist_inode(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 = -ENOENT;
|
|
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_qadata *qa = gfs2_qadata_get(ndip);
|
|
|
|
if (!qa) {
|
|
error = -ENOMEM;
|
|
goto out_gunlock;
|
|
}
|
|
|
|
error = gfs2_quota_lock_check(ndip);
|
|
if (error)
|
|
goto out_alloc;
|
|
|
|
error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres);
|
|
if (error)
|
|
goto out_gunlock_q;
|
|
|
|
error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
|
|
gfs2_rg_blocks(ndip) +
|
|
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) {
|
|
struct buffer_head *bh;
|
|
error = gfs2_meta_inode_buffer(nip, &bh);
|
|
if (error)
|
|
goto out_end_trans;
|
|
error = gfs2_unlink_inode(ndip, ndentry, bh);
|
|
brelse(bh);
|
|
}
|
|
|
|
if (dir_rename) {
|
|
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);
|
|
if (error)
|
|
goto out_end_trans;
|
|
|
|
error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
|
|
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_qadata_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:
|
|
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 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;
|
|
}
|
|
|
|
buf = kzalloc(size + 1, GFP_NOFS);
|
|
if (!buf)
|
|
buf = ERR_PTR(-ENOMEM);
|
|
else
|
|
memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
|
|
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: The inode
|
|
* @mask: The mask to be tested
|
|
* @flags: Indicates whether this is an RCU path walk or not
|
|
*
|
|
* 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;
|
|
struct gfs2_holder i_gh;
|
|
int error;
|
|
int unlock = 0;
|
|
|
|
|
|
ip = GFS2_I(inode);
|
|
if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
|
|
if (mask & MAY_NOT_BLOCK)
|
|
return -ECHILD;
|
|
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);
|
|
if (unlock)
|
|
gfs2_glock_dq_uninit(&i_gh);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
|
|
{
|
|
setattr_copy(inode, attr);
|
|
mark_inode_dirty(inode);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* gfs2_setattr_simple -
|
|
* @ip:
|
|
* @attr:
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
|
|
{
|
|
int error;
|
|
|
|
if (current->journal_info)
|
|
return __gfs2_setattr_simple(inode, attr);
|
|
|
|
error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
|
|
if (error)
|
|
return error;
|
|
|
|
error = __gfs2_setattr_simple(inode, attr);
|
|
gfs2_trans_end(GFS2_SB(inode));
|
|
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);
|
|
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_qadata_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_setattr_simple(inode, attr);
|
|
if (error)
|
|
goto out_end_trans;
|
|
|
|
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_qadata_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(inode, attr);
|
|
|
|
out:
|
|
if (!error)
|
|
mark_inode_dirty(inode);
|
|
gfs2_glock_dq_uninit(&i_gh);
|
|
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 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,
|
|
.fiemap = gfs2_fiemap,
|
|
.get_acl = gfs2_get_acl,
|
|
};
|
|
|
|
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_unlink,
|
|
.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,
|
|
.get_acl = gfs2_get_acl,
|
|
};
|
|
|
|
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,
|
|
.get_acl = gfs2_get_acl,
|
|
};
|
|
|