| /* |
| * 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/sched.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/completion.h> |
| #include <linux/buffer_head.h> |
| #include <linux/posix_acl.h> |
| #include <linux/sort.h> |
| #include <linux/gfs2_ondisk.h> |
| #include <linux/crc32.h> |
| #include <linux/lm_interface.h> |
| #include <linux/security.h> |
| |
| #include "gfs2.h" |
| #include "incore.h" |
| #include "acl.h" |
| #include "bmap.h" |
| #include "dir.h" |
| #include "eattr.h" |
| #include "glock.h" |
| #include "glops.h" |
| #include "inode.h" |
| #include "log.h" |
| #include "meta_io.h" |
| #include "ops_address.h" |
| #include "ops_file.h" |
| #include "ops_inode.h" |
| #include "quota.h" |
| #include "rgrp.h" |
| #include "trans.h" |
| #include "util.h" |
| |
| /** |
| * gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode |
| * @ip: The GFS2 inode (with embedded disk inode data) |
| * @inode: The Linux VFS inode |
| * |
| */ |
| |
| void gfs2_inode_attr_in(struct gfs2_inode *ip) |
| { |
| struct inode *inode = &ip->i_inode; |
| struct gfs2_dinode_host *di = &ip->i_di; |
| |
| inode->i_ino = ip->i_num.no_addr; |
| inode->i_nlink = di->di_nlink; |
| i_size_write(inode, di->di_size); |
| inode->i_atime.tv_sec = di->di_atime; |
| inode->i_mtime.tv_sec = di->di_mtime; |
| inode->i_ctime.tv_sec = di->di_ctime; |
| inode->i_atime.tv_nsec = 0; |
| inode->i_mtime.tv_nsec = 0; |
| inode->i_ctime.tv_nsec = 0; |
| inode->i_blocks = di->di_blocks << |
| (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT); |
| |
| if (di->di_flags & GFS2_DIF_IMMUTABLE) |
| inode->i_flags |= S_IMMUTABLE; |
| else |
| inode->i_flags &= ~S_IMMUTABLE; |
| |
| if (di->di_flags & GFS2_DIF_APPENDONLY) |
| inode->i_flags |= S_APPEND; |
| else |
| inode->i_flags &= ~S_APPEND; |
| } |
| |
| /** |
| * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode |
| * @ip: The GFS2 inode |
| * |
| * Only copy out the attributes that we want the VFS layer |
| * to be able to modify. |
| */ |
| |
| void gfs2_inode_attr_out(struct gfs2_inode *ip) |
| { |
| struct inode *inode = &ip->i_inode; |
| struct gfs2_dinode_host *di = &ip->i_di; |
| di->di_atime = inode->i_atime.tv_sec; |
| di->di_mtime = inode->i_mtime.tv_sec; |
| di->di_ctime = inode->i_ctime.tv_sec; |
| } |
| |
| static int iget_test(struct inode *inode, void *opaque) |
| { |
| struct gfs2_inode *ip = GFS2_I(inode); |
| struct gfs2_inum_host *inum = opaque; |
| |
| if (ip && ip->i_num.no_addr == inum->no_addr) |
| return 1; |
| |
| return 0; |
| } |
| |
| static int iget_set(struct inode *inode, void *opaque) |
| { |
| struct gfs2_inode *ip = GFS2_I(inode); |
| struct gfs2_inum_host *inum = opaque; |
| |
| ip->i_num = *inum; |
| return 0; |
| } |
| |
| struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum_host *inum) |
| { |
| return ilookup5(sb, (unsigned long)inum->no_formal_ino, |
| iget_test, inum); |
| } |
| |
| static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum_host *inum) |
| { |
| return iget5_locked(sb, (unsigned long)inum->no_formal_ino, |
| iget_test, iget_set, inum); |
| } |
| |
| /** |
| * gfs2_inode_lookup - Lookup an inode |
| * @sb: The super block |
| * @inum: The inode number |
| * @type: The type of the inode |
| * |
| * Returns: A VFS inode, or an error |
| */ |
| |
| struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum_host *inum, unsigned int type) |
| { |
| struct inode *inode = gfs2_iget(sb, inum); |
| struct gfs2_inode *ip = GFS2_I(inode); |
| struct gfs2_glock *io_gl; |
| int error; |
| |
| if (!inode) |
| return ERR_PTR(-ENOBUFS); |
| |
| if (inode->i_state & I_NEW) { |
| struct gfs2_sbd *sdp = GFS2_SB(inode); |
| umode_t mode = DT2IF(type); |
| inode->i_private = ip; |
| inode->i_mode = mode; |
| |
| if (S_ISREG(mode)) { |
| inode->i_op = &gfs2_file_iops; |
| inode->i_fop = &gfs2_file_fops; |
| inode->i_mapping->a_ops = &gfs2_file_aops; |
| } else if (S_ISDIR(mode)) { |
| inode->i_op = &gfs2_dir_iops; |
| inode->i_fop = &gfs2_dir_fops; |
| } else if (S_ISLNK(mode)) { |
| inode->i_op = &gfs2_symlink_iops; |
| } else { |
| inode->i_op = &gfs2_dev_iops; |
| } |
| |
| error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); |
| if (unlikely(error)) |
| goto fail; |
| ip->i_gl->gl_object = ip; |
| |
| error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl); |
| if (unlikely(error)) |
| goto fail_put; |
| |
| ip->i_vn = ip->i_gl->gl_vn - 1; |
| error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); |
| if (unlikely(error)) |
| goto fail_iopen; |
| |
| gfs2_glock_put(io_gl); |
| unlock_new_inode(inode); |
| } |
| |
| return inode; |
| fail_iopen: |
| gfs2_glock_put(io_gl); |
| fail_put: |
| ip->i_gl->gl_object = NULL; |
| gfs2_glock_put(ip->i_gl); |
| fail: |
| iput(inode); |
| return ERR_PTR(error); |
| } |
| |
| static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf) |
| { |
| struct gfs2_dinode_host *di = &ip->i_di; |
| const struct gfs2_dinode *str = buf; |
| |
| if (ip->i_num.no_addr != be64_to_cpu(str->di_num.no_addr)) { |
| if (gfs2_consist_inode(ip)) |
| gfs2_dinode_print(ip); |
| return -EIO; |
| } |
| if (ip->i_num.no_formal_ino != be64_to_cpu(str->di_num.no_formal_ino)) |
| return -ESTALE; |
| |
| ip->i_inode.i_mode = be32_to_cpu(str->di_mode); |
| ip->i_inode.i_rdev = 0; |
| switch (ip->i_inode.i_mode & S_IFMT) { |
| case S_IFBLK: |
| case S_IFCHR: |
| ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major), |
| be32_to_cpu(str->di_minor)); |
| break; |
| }; |
| |
| ip->i_inode.i_uid = be32_to_cpu(str->di_uid); |
| ip->i_inode.i_gid = be32_to_cpu(str->di_gid); |
| di->di_nlink = be32_to_cpu(str->di_nlink); |
| di->di_size = be64_to_cpu(str->di_size); |
| di->di_blocks = be64_to_cpu(str->di_blocks); |
| di->di_atime = be64_to_cpu(str->di_atime); |
| di->di_mtime = be64_to_cpu(str->di_mtime); |
| di->di_ctime = be64_to_cpu(str->di_ctime); |
| |
| di->di_goal_meta = be64_to_cpu(str->di_goal_meta); |
| di->di_goal_data = be64_to_cpu(str->di_goal_data); |
| di->di_generation = be64_to_cpu(str->di_generation); |
| |
| di->di_flags = be32_to_cpu(str->di_flags); |
| di->di_payload_format = be32_to_cpu(str->di_payload_format); |
| di->di_height = be16_to_cpu(str->di_height); |
| |
| di->di_depth = be16_to_cpu(str->di_depth); |
| di->di_entries = be32_to_cpu(str->di_entries); |
| |
| di->di_eattr = be64_to_cpu(str->di_eattr); |
| return 0; |
| } |
| |
| /** |
| * gfs2_inode_refresh - Refresh the incore copy of the dinode |
| * @ip: The GFS2 inode |
| * |
| * Returns: errno |
| */ |
| |
| int gfs2_inode_refresh(struct gfs2_inode *ip) |
| { |
| struct buffer_head *dibh; |
| int error; |
| |
| error = gfs2_meta_inode_buffer(ip, &dibh); |
| if (error) |
| return error; |
| |
| if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) { |
| brelse(dibh); |
| return -EIO; |
| } |
| |
| error = gfs2_dinode_in(ip, dibh->b_data); |
| brelse(dibh); |
| ip->i_vn = ip->i_gl->gl_vn; |
| |
| return error; |
| } |
| |
| int gfs2_dinode_dealloc(struct gfs2_inode *ip) |
| { |
| struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
| struct gfs2_alloc *al; |
| struct gfs2_rgrpd *rgd; |
| int error; |
| |
| if (ip->i_di.di_blocks != 1) { |
| if (gfs2_consist_inode(ip)) |
| gfs2_dinode_print(ip); |
| return -EIO; |
| } |
| |
| al = gfs2_alloc_get(ip); |
| |
| error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); |
| if (error) |
| goto out; |
| |
| error = gfs2_rindex_hold(sdp, &al->al_ri_gh); |
| if (error) |
| goto out_qs; |
| |
| rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); |
| if (!rgd) { |
| gfs2_consist_inode(ip); |
| error = -EIO; |
| goto out_rindex_relse; |
| } |
| |
| error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, |
| &al->al_rgd_gh); |
| if (error) |
| goto out_rindex_relse; |
| |
| error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1); |
| if (error) |
| goto out_rg_gunlock; |
| |
| gfs2_trans_add_gl(ip->i_gl); |
| |
| gfs2_free_di(rgd, ip); |
| |
| gfs2_trans_end(sdp); |
| clear_bit(GLF_STICKY, &ip->i_gl->gl_flags); |
| |
| out_rg_gunlock: |
| gfs2_glock_dq_uninit(&al->al_rgd_gh); |
| out_rindex_relse: |
| gfs2_glock_dq_uninit(&al->al_ri_gh); |
| out_qs: |
| gfs2_quota_unhold(ip); |
| out: |
| gfs2_alloc_put(ip); |
| return error; |
| } |
| |
| /** |
| * gfs2_change_nlink - Change nlink count on inode |
| * @ip: The GFS2 inode |
| * @diff: The change in the nlink count required |
| * |
| * Returns: errno |
| */ |
| |
| int gfs2_change_nlink(struct gfs2_inode *ip, int diff) |
| { |
| struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info; |
| struct buffer_head *dibh; |
| u32 nlink; |
| int error; |
| |
| BUG_ON(ip->i_di.di_nlink != ip->i_inode.i_nlink); |
| nlink = ip->i_di.di_nlink + diff; |
| |
| /* If we are reducing the nlink count, but the new value ends up being |
| bigger than the old one, we must have underflowed. */ |
| if (diff < 0 && nlink > ip->i_di.di_nlink) { |
| if (gfs2_consist_inode(ip)) |
| gfs2_dinode_print(ip); |
| return -EIO; |
| } |
| |
| error = gfs2_meta_inode_buffer(ip, &dibh); |
| if (error) |
| return error; |
| |
| ip->i_di.di_nlink = nlink; |
| ip->i_di.di_ctime = get_seconds(); |
| ip->i_inode.i_nlink = nlink; |
| |
| gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
| gfs2_dinode_out(ip, dibh->b_data); |
| brelse(dibh); |
| mark_inode_dirty(&ip->i_inode); |
| |
| if (ip->i_di.di_nlink == 0) { |
| struct gfs2_rgrpd *rgd; |
| struct gfs2_holder ri_gh, rg_gh; |
| |
| error = gfs2_rindex_hold(sdp, &ri_gh); |
| if (error) |
| goto out; |
| error = -EIO; |
| rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr); |
| if (!rgd) |
| goto out_norgrp; |
| error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh); |
| if (error) |
| goto out_norgrp; |
| |
| clear_nlink(&ip->i_inode); |
| gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */ |
| gfs2_glock_dq_uninit(&rg_gh); |
| out_norgrp: |
| gfs2_glock_dq_uninit(&ri_gh); |
| } |
| out: |
| return error; |
| } |
| |
| struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) |
| { |
| struct qstr qstr; |
| gfs2_str2qstr(&qstr, name); |
| return gfs2_lookupi(dip, &qstr, 1, NULL); |
| } |
| |
| |
| /** |
| * gfs2_lookupi - Look up a filename in a directory and return its inode |
| * @d_gh: An initialized holder for the directory glock |
| * @name: The name of the inode to look for |
| * @is_root: If 1, ignore the caller's permissions |
| * @i_gh: An uninitialized holder for the new inode glock |
| * |
| * There will always be a vnode (Linux VFS inode) for the d_gh inode unless |
| * @is_root is true. |
| * |
| * Returns: errno |
| */ |
| |
| struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, |
| int is_root, struct nameidata *nd) |
| { |
| struct super_block *sb = dir->i_sb; |
| struct gfs2_inode *dip = GFS2_I(dir); |
| struct gfs2_holder d_gh; |
| struct gfs2_inum_host inum; |
| unsigned int type; |
| int error = 0; |
| struct inode *inode = NULL; |
| |
| if (!name->len || name->len > GFS2_FNAMESIZE) |
| return ERR_PTR(-ENAMETOOLONG); |
| |
| if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || |
| (name->len == 2 && memcmp(name->name, "..", 2) == 0 && |
| dir == sb->s_root->d_inode)) { |
| igrab(dir); |
| return dir; |
| } |
| |
| error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); |
| if (error) |
| return ERR_PTR(error); |
| |
| if (!is_root) { |
| error = permission(dir, MAY_EXEC, NULL); |
| if (error) |
| goto out; |
| } |
| |
| error = gfs2_dir_search(dir, name, &inum, &type); |
| if (error) |
| goto out; |
| |
| inode = gfs2_inode_lookup(sb, &inum, type); |
| |
| out: |
| gfs2_glock_dq_uninit(&d_gh); |
| if (error == -ENOENT) |
| return NULL; |
| return inode; |
| } |
| |
| static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino) |
| { |
| struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
| struct buffer_head *bh; |
| struct gfs2_inum_range_host ir; |
| int error; |
| |
| error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
| if (error) |
| return error; |
| mutex_lock(&sdp->sd_inum_mutex); |
| |
| error = gfs2_meta_inode_buffer(ip, &bh); |
| if (error) { |
| mutex_unlock(&sdp->sd_inum_mutex); |
| gfs2_trans_end(sdp); |
| return error; |
| } |
| |
| gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
| |
| if (ir.ir_length) { |
| *formal_ino = ir.ir_start++; |
| ir.ir_length--; |
| gfs2_trans_add_bh(ip->i_gl, bh, 1); |
| gfs2_inum_range_out(&ir, |
| bh->b_data + sizeof(struct gfs2_dinode)); |
| brelse(bh); |
| mutex_unlock(&sdp->sd_inum_mutex); |
| gfs2_trans_end(sdp); |
| return 0; |
| } |
| |
| brelse(bh); |
| |
| mutex_unlock(&sdp->sd_inum_mutex); |
| gfs2_trans_end(sdp); |
| |
| return 1; |
| } |
| |
| static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino) |
| { |
| struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
| struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode); |
| struct gfs2_holder gh; |
| struct buffer_head *bh; |
| struct gfs2_inum_range_host ir; |
| int error; |
| |
| error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
| if (error) |
| return error; |
| |
| error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); |
| if (error) |
| goto out; |
| mutex_lock(&sdp->sd_inum_mutex); |
| |
| error = gfs2_meta_inode_buffer(ip, &bh); |
| if (error) |
| goto out_end_trans; |
| |
| gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
| |
| if (!ir.ir_length) { |
| struct buffer_head *m_bh; |
| u64 x, y; |
| __be64 z; |
| |
| error = gfs2_meta_inode_buffer(m_ip, &m_bh); |
| if (error) |
| goto out_brelse; |
| |
| z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)); |
| x = y = be64_to_cpu(z); |
| ir.ir_start = x; |
| ir.ir_length = GFS2_INUM_QUANTUM; |
| x += GFS2_INUM_QUANTUM; |
| if (x < y) |
| gfs2_consist_inode(m_ip); |
| z = cpu_to_be64(x); |
| gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); |
| *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z; |
| |
| brelse(m_bh); |
| } |
| |
| *formal_ino = ir.ir_start++; |
| ir.ir_length--; |
| |
| gfs2_trans_add_bh(ip->i_gl, bh, 1); |
| gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
| |
| out_brelse: |
| brelse(bh); |
| out_end_trans: |
| mutex_unlock(&sdp->sd_inum_mutex); |
| gfs2_trans_end(sdp); |
| out: |
| gfs2_glock_dq_uninit(&gh); |
| return error; |
| } |
| |
| static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum) |
| { |
| int error; |
| |
| error = pick_formal_ino_1(sdp, inum); |
| if (error <= 0) |
| return error; |
| |
| error = pick_formal_ino_2(sdp, inum); |
| |
| return error; |
| } |
| |
| /** |
| * create_ok - OK to create a new on-disk inode here? |
| * @dip: Directory in which dinode is to be created |
| * @name: Name of new dinode |
| * @mode: |
| * |
| * Returns: errno |
| */ |
| |
| static int create_ok(struct gfs2_inode *dip, const struct qstr *name, |
| unsigned int mode) |
| { |
| int error; |
| |
| error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
| if (error) |
| return error; |
| |
| /* Don't create entries in an unlinked directory */ |
| if (!dip->i_di.di_nlink) |
| return -EPERM; |
| |
| error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL); |
| switch (error) { |
| case -ENOENT: |
| error = 0; |
| break; |
| case 0: |
| return -EEXIST; |
| default: |
| return error; |
| } |
| |
| if (dip->i_di.di_entries == (u32)-1) |
| return -EFBIG; |
| if (S_ISDIR(mode) && dip->i_di.di_nlink == (u32)-1) |
| return -EMLINK; |
| |
| return 0; |
| } |
| |
| static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, |
| unsigned int *uid, unsigned int *gid) |
| { |
| if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && |
| (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) { |
| if (S_ISDIR(*mode)) |
| *mode |= S_ISUID; |
| else if (dip->i_inode.i_uid != current->fsuid) |
| *mode &= ~07111; |
| *uid = dip->i_inode.i_uid; |
| } else |
| *uid = current->fsuid; |
| |
| if (dip->i_inode.i_mode & S_ISGID) { |
| if (S_ISDIR(*mode)) |
| *mode |= S_ISGID; |
| *gid = dip->i_inode.i_gid; |
| } else |
| *gid = current->fsgid; |
| } |
| |
| static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum_host *inum, |
| u64 *generation) |
| { |
| struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
| int error; |
| |
| gfs2_alloc_get(dip); |
| |
| dip->i_alloc.al_requested = RES_DINODE; |
| error = gfs2_inplace_reserve(dip); |
| if (error) |
| goto out; |
| |
| error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); |
| if (error) |
| goto out_ipreserv; |
| |
| inum->no_addr = gfs2_alloc_di(dip, generation); |
| |
| gfs2_trans_end(sdp); |
| |
| out_ipreserv: |
| gfs2_inplace_release(dip); |
| out: |
| gfs2_alloc_put(dip); |
| return error; |
| } |
| |
| /** |
| * init_dinode - Fill in a new dinode structure |
| * @dip: the directory this inode is being created in |
| * @gl: The glock covering the new inode |
| * @inum: the inode number |
| * @mode: the file permissions |
| * @uid: |
| * @gid: |
| * |
| */ |
| |
| static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, |
| const struct gfs2_inum_host *inum, unsigned int mode, |
| unsigned int uid, unsigned int gid, |
| const u64 *generation, dev_t dev) |
| { |
| struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
| struct gfs2_dinode *di; |
| struct buffer_head *dibh; |
| |
| dibh = gfs2_meta_new(gl, inum->no_addr); |
| gfs2_trans_add_bh(gl, dibh, 1); |
| gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); |
| gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); |
| di = (struct gfs2_dinode *)dibh->b_data; |
| |
| di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); |
| di->di_num.no_addr = cpu_to_be64(inum->no_addr); |
| di->di_mode = cpu_to_be32(mode); |
| di->di_uid = cpu_to_be32(uid); |
| di->di_gid = cpu_to_be32(gid); |
| di->di_nlink = cpu_to_be32(0); |
| di->di_size = cpu_to_be64(0); |
| di->di_blocks = cpu_to_be64(1); |
| di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds()); |
| 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 = cpu_to_be32(0); |
| |
| if (S_ISREG(mode)) { |
| if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) || |
| gfs2_tune_get(sdp, gt_new_files_jdata)) |
| di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); |
| if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) || |
| gfs2_tune_get(sdp, gt_new_files_directio)) |
| di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO); |
| } else if (S_ISDIR(mode)) { |
| di->di_flags |= cpu_to_be32(dip->i_di.di_flags & |
| GFS2_DIF_INHERIT_DIRECTIO); |
| di->di_flags |= cpu_to_be32(dip->i_di.di_flags & |
| GFS2_DIF_INHERIT_JDATA); |
| } |
| |
| di->__pad1 = 0; |
| di->di_payload_format = cpu_to_be32(0); |
| di->di_height = cpu_to_be32(0); |
| di->__pad2 = 0; |
| di->__pad3 = 0; |
| di->di_depth = cpu_to_be16(0); |
| di->di_entries = cpu_to_be32(0); |
| memset(&di->__pad4, 0, sizeof(di->__pad4)); |
| di->di_eattr = cpu_to_be64(0); |
| memset(&di->di_reserved, 0, sizeof(di->di_reserved)); |
| |
| brelse(dibh); |
| } |
| |
| static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, |
| unsigned int mode, const struct gfs2_inum_host *inum, |
| const u64 *generation, dev_t dev) |
| { |
| struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
| unsigned int uid, gid; |
| int error; |
| |
| munge_mode_uid_gid(dip, &mode, &uid, &gid); |
| gfs2_alloc_get(dip); |
| |
| 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); |
| gfs2_quota_change(dip, +1, uid, gid); |
| gfs2_trans_end(sdp); |
| |
| out_quota: |
| gfs2_quota_unlock(dip); |
| out: |
| gfs2_alloc_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_alloc *al; |
| int alloc_required; |
| struct buffer_head *dibh; |
| int error; |
| |
| al = gfs2_alloc_get(dip); |
| |
| 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; |
| if (alloc_required) { |
| error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid); |
| if (error) |
| goto fail_quota_locks; |
| |
| al->al_requested = sdp->sd_max_dirres; |
| |
| error = gfs2_inplace_reserve(dip); |
| if (error) |
| goto fail_quota_locks; |
| |
| error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
| al->al_rgd->rd_ri.ri_length + |
| 2 * RES_DINODE + |
| RES_STATFS + RES_QUOTA, 0); |
| if (error) |
| goto 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->i_num, IF2DT(ip->i_inode.i_mode)); |
| if (error) |
| goto fail_end_trans; |
| |
| error = gfs2_meta_inode_buffer(ip, &dibh); |
| if (error) |
| goto fail_end_trans; |
| ip->i_di.di_nlink = 1; |
| 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: |
| if (dip->i_alloc.al_rgd) |
| gfs2_inplace_release(dip); |
| |
| fail_quota_locks: |
| gfs2_quota_unlock(dip); |
| |
| fail: |
| gfs2_alloc_put(dip); |
| return error; |
| } |
| |
| static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip) |
| { |
| int err; |
| size_t len; |
| void *value; |
| char *name; |
| struct gfs2_ea_request er; |
| |
| err = security_inode_init_security(&ip->i_inode, &dip->i_inode, |
| &name, &value, &len); |
| |
| if (err) { |
| if (err == -EOPNOTSUPP) |
| return 0; |
| return err; |
| } |
| |
| memset(&er, 0, sizeof(struct gfs2_ea_request)); |
| |
| er.er_type = GFS2_EATYPE_SECURITY; |
| er.er_name = name; |
| er.er_data = value; |
| er.er_name_len = strlen(name); |
| er.er_data_len = len; |
| |
| err = gfs2_ea_set_i(ip, &er); |
| |
| kfree(value); |
| kfree(name); |
| |
| return err; |
| } |
| |
| /** |
| * gfs2_createi - Create a new inode |
| * @ghs: An array of two holders |
| * @name: The name of the new file |
| * @mode: the permissions on the new inode |
| * |
| * @ghs[0] is an initialized holder for the directory |
| * @ghs[1] is the holder for the inode lock |
| * |
| * If the return value is not NULL, the glocks on both the directory and the new |
| * file are held. A transaction has been started and an inplace reservation |
| * is held, as well. |
| * |
| * Returns: An inode |
| */ |
| |
| struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, |
| unsigned int mode, dev_t dev) |
| { |
| struct inode *inode; |
| struct gfs2_inode *dip = ghs->gh_gl->gl_object; |
| struct inode *dir = &dip->i_inode; |
| struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
| struct gfs2_inum_host inum; |
| int error; |
| u64 generation; |
| |
| if (!name->len || name->len > GFS2_FNAMESIZE) |
| return ERR_PTR(-ENAMETOOLONG); |
| |
| gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); |
| error = gfs2_glock_nq(ghs); |
| if (error) |
| goto fail; |
| |
| error = create_ok(dip, name, mode); |
| if (error) |
| goto fail_gunlock; |
| |
| error = pick_formal_ino(sdp, &inum.no_formal_ino); |
| if (error) |
| goto fail_gunlock; |
| |
| error = alloc_dinode(dip, &inum, &generation); |
| if (error) |
| goto fail_gunlock; |
| |
| if (inum.no_addr < dip->i_num.no_addr) { |
| gfs2_glock_dq(ghs); |
| |
| error = gfs2_glock_nq_num(sdp, inum.no_addr, |
| &gfs2_inode_glops, LM_ST_EXCLUSIVE, |
| GL_SKIP, ghs + 1); |
| if (error) { |
| return ERR_PTR(error); |
| } |
| |
| gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); |
| error = gfs2_glock_nq(ghs); |
| if (error) { |
| gfs2_glock_dq_uninit(ghs + 1); |
| return ERR_PTR(error); |
| } |
| |
| error = create_ok(dip, name, mode); |
| if (error) |
| goto fail_gunlock2; |
| } else { |
| 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); |
| if (error) |
| goto fail_gunlock2; |
| |
| inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode)); |
| if (IS_ERR(inode)) |
| goto fail_gunlock2; |
| |
| error = gfs2_inode_refresh(GFS2_I(inode)); |
| if (error) |
| goto fail_iput; |
| |
| error = gfs2_acl_create(dip, GFS2_I(inode)); |
| if (error) |
| goto fail_iput; |
| |
| error = gfs2_security_init(dip, GFS2_I(inode)); |
| if (error) |
| goto fail_iput; |
| |
| error = link_dinode(dip, name, GFS2_I(inode)); |
| if (error) |
| goto fail_iput; |
| |
| if (!inode) |
| return ERR_PTR(-ENOMEM); |
| return inode; |
| |
| fail_iput: |
| iput(inode); |
| fail_gunlock2: |
| gfs2_glock_dq_uninit(ghs + 1); |
| fail_gunlock: |
| gfs2_glock_dq(ghs); |
| fail: |
| return ERR_PTR(error); |
| } |
| |
| /** |
| * 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 |
| */ |
| |
| int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, |
| struct gfs2_inode *ip) |
| { |
| struct qstr dotname; |
| int error; |
| |
| if (ip->i_di.di_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; |
| |
| gfs2_str2qstr(&dotname, "."); |
| error = gfs2_dir_del(ip, &dotname); |
| if (error) |
| return error; |
| |
| gfs2_str2qstr(&dotname, ".."); |
| error = gfs2_dir_del(ip, &dotname); |
| if (error) |
| return error; |
| |
| error = gfs2_change_nlink(ip, -2); |
| if (error) |
| return error; |
| |
| 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 |
| */ |
| |
| int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, |
| struct gfs2_inode *ip) |
| { |
| struct gfs2_inum_host inum; |
| unsigned int type; |
| 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 = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL); |
| if (error) |
| return error; |
| |
| error = gfs2_dir_search(&dip->i_inode, name, &inum, &type); |
| if (error) |
| return error; |
| |
| if (!gfs2_inum_equal(&inum, &ip->i_num)) |
| return -ENOENT; |
| |
| if (IF2DT(ip->i_inode.i_mode) != type) { |
| gfs2_consist_inode(dip); |
| return -EIO; |
| } |
| |
| 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 |
| */ |
| |
| 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; |
| struct qstr dotdot; |
| int error = 0; |
| |
| gfs2_str2qstr(&dotdot, ".."); |
| |
| 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, &dotdot, 1, NULL); |
| if (IS_ERR(tmp)) { |
| error = PTR_ERR(tmp); |
| break; |
| } |
| |
| iput(dir); |
| dir = tmp; |
| } |
| |
| iput(dir); |
| |
| return error; |
| } |
| |
| /** |
| * gfs2_readlinki - return the contents of a symlink |
| * @ip: the symlink's inode |
| * @buf: a pointer to the buffer to be filled |
| * @len: a pointer to the length of @buf |
| * |
| * If @buf is too small, a piece of memory is kmalloc()ed and needs |
| * to be freed by the caller. |
| * |
| * Returns: errno |
| */ |
| |
| int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) |
| { |
| struct gfs2_holder i_gh; |
| struct buffer_head *dibh; |
| unsigned int x; |
| int error; |
| |
| gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); |
| error = gfs2_glock_nq_atime(&i_gh); |
| if (error) { |
| gfs2_holder_uninit(&i_gh); |
| return error; |
| } |
| |
| if (!ip->i_di.di_size) { |
| gfs2_consist_inode(ip); |
| error = -EIO; |
| goto out; |
| } |
| |
| error = gfs2_meta_inode_buffer(ip, &dibh); |
| if (error) |
| goto out; |
| |
| x = ip->i_di.di_size + 1; |
| if (x > *len) { |
| *buf = kmalloc(x, GFP_KERNEL); |
| if (!*buf) { |
| error = -ENOMEM; |
| goto out_brelse; |
| } |
| } |
| |
| memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); |
| *len = x; |
| |
| out_brelse: |
| brelse(dibh); |
| out: |
| gfs2_glock_dq_uninit(&i_gh); |
| return error; |
| } |
| |
| /** |
| * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and |
| * conditionally update the inode's atime |
| * @gh: the holder to acquire |
| * |
| * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap |
| * Update if the difference between the current time and the inode's current |
| * atime is greater than an interval specified at mount. |
| * |
| * Returns: errno |
| */ |
| |
| int gfs2_glock_nq_atime(struct gfs2_holder *gh) |
| { |
| struct gfs2_glock *gl = gh->gh_gl; |
| struct gfs2_sbd *sdp = gl->gl_sbd; |
| struct gfs2_inode *ip = gl->gl_object; |
| s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum); |
| unsigned int state; |
| int flags; |
| int error; |
| |
| if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) || |
| gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) || |
| gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops)) |
| return -EINVAL; |
| |
| state = gh->gh_state; |
| flags = gh->gh_flags; |
| |
| error = gfs2_glock_nq(gh); |
| if (error) |
| return error; |
| |
| if (test_bit(SDF_NOATIME, &sdp->sd_flags) || |
| (sdp->sd_vfs->s_flags & MS_RDONLY)) |
| return 0; |
| |
| curtime = get_seconds(); |
| if (curtime - ip->i_di.di_atime >= quantum) { |
| gfs2_glock_dq(gh); |
| gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY, |
| gh); |
| error = gfs2_glock_nq(gh); |
| if (error) |
| return error; |
| |
| /* Verify that atime hasn't been updated while we were |
| trying to get exclusive lock. */ |
| |
| curtime = get_seconds(); |
| if (curtime - ip->i_di.di_atime >= quantum) { |
| struct buffer_head *dibh; |
| struct gfs2_dinode *di; |
| |
| error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
| if (error == -EROFS) |
| return 0; |
| if (error) |
| goto fail; |
| |
| error = gfs2_meta_inode_buffer(ip, &dibh); |
| if (error) |
| goto fail_end_trans; |
| |
| ip->i_di.di_atime = curtime; |
| |
| gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
| di = (struct gfs2_dinode *)dibh->b_data; |
| di->di_atime = cpu_to_be64(ip->i_di.di_atime); |
| brelse(dibh); |
| |
| gfs2_trans_end(sdp); |
| } |
| |
| /* If someone else has asked for the glock, |
| unlock and let them have it. Then reacquire |
| in the original state. */ |
| if (gfs2_glock_is_blocking(gl)) { |
| gfs2_glock_dq(gh); |
| gfs2_holder_reinit(state, flags, gh); |
| return gfs2_glock_nq(gh); |
| } |
| } |
| |
| return 0; |
| |
| fail_end_trans: |
| gfs2_trans_end(sdp); |
| fail: |
| gfs2_glock_dq(gh); |
| return error; |
| } |
| |
| /** |
| * glock_compare_atime - Compare two struct gfs2_glock structures for sort |
| * @arg_a: the first structure |
| * @arg_b: the second structure |
| * |
| * Returns: 1 if A > B |
| * -1 if A < B |
| * 0 if A == B |
| */ |
| |
| static int glock_compare_atime(const void *arg_a, const void *arg_b) |
| { |
| const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a; |
| const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b; |
| const struct lm_lockname *a = &gh_a->gh_gl->gl_name; |
| const struct lm_lockname *b = &gh_b->gh_gl->gl_name; |
| |
| if (a->ln_number > b->ln_number) |
| return 1; |
| if (a->ln_number < b->ln_number) |
| return -1; |
| if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE) |
| return 1; |
| if (gh_a->gh_state == LM_ST_SHARED && (gh_b->gh_flags & GL_ATIME)) |
| return 1; |
| |
| return 0; |
| } |
| |
| /** |
| * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an |
| * atime update |
| * @num_gh: the number of structures |
| * @ghs: an array of struct gfs2_holder structures |
| * |
| * Returns: 0 on success (all glocks acquired), |
| * errno on failure (no glocks acquired) |
| */ |
| |
| int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs) |
| { |
| struct gfs2_holder **p; |
| unsigned int x; |
| int error = 0; |
| |
| if (!num_gh) |
| return 0; |
| |
| if (num_gh == 1) { |
| ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); |
| if (ghs->gh_flags & GL_ATIME) |
| error = gfs2_glock_nq_atime(ghs); |
| else |
| error = gfs2_glock_nq(ghs); |
| return error; |
| } |
| |
| p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL); |
| if (!p) |
| return -ENOMEM; |
| |
| for (x = 0; x < num_gh; x++) |
| p[x] = &ghs[x]; |
| |
| sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL); |
| |
| for (x = 0; x < num_gh; x++) { |
| p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC); |
| |
| if (p[x]->gh_flags & GL_ATIME) |
| error = gfs2_glock_nq_atime(p[x]); |
| else |
| error = gfs2_glock_nq(p[x]); |
| |
| if (error) { |
| while (x--) |
| gfs2_glock_dq(p[x]); |
| break; |
| } |
| } |
| |
| kfree(p); |
| return error; |
| } |
| |
| |
| static int |
| __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) |
| { |
| struct buffer_head *dibh; |
| int error; |
| |
| error = gfs2_meta_inode_buffer(ip, &dibh); |
| if (!error) { |
| error = inode_setattr(&ip->i_inode, attr); |
| gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); |
| gfs2_inode_attr_out(ip); |
| |
| gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
| gfs2_dinode_out(ip, dibh->b_data); |
| brelse(dibh); |
| } |
| return error; |
| } |
| |
| /** |
| * gfs2_setattr_simple - |
| * @ip: |
| * @attr: |
| * |
| * Called with a reference on the vnode. |
| * |
| * Returns: errno |
| */ |
| |
| int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) |
| { |
| int error; |
| |
| if (current->journal_info) |
| return __gfs2_setattr_simple(ip, attr); |
| |
| error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); |
| if (error) |
| return error; |
| |
| error = __gfs2_setattr_simple(ip, attr); |
| gfs2_trans_end(GFS2_SB(&ip->i_inode)); |
| return error; |
| } |
| |