/* * 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" static int iget_test(struct inode *inode, void *opaque) { struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_inum_host *inum = opaque; if (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; inode->i_ino = inum->no_addr; 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; set_bit(GIF_INVALID, &ip->i_flags); 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); /* * We will need to review setting the nlink count here in the * light of the forthcoming ro bind mount work. This is a reminder * to do that. */ ip->i_inode.i_nlink = be32_to_cpu(str->di_nlink); di->di_size = be64_to_cpu(str->di_size); i_size_write(&ip->i_inode, di->di_size); di->di_blocks = be64_to_cpu(str->di_blocks); gfs2_set_inode_blocks(&ip->i_inode); ip->i_inode.i_atime.tv_sec = be64_to_cpu(str->di_atime); ip->i_inode.i_atime.tv_nsec = 0; ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime); ip->i_inode.i_mtime.tv_nsec = 0; ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime); ip->i_inode.i_ctime.tv_nsec = 0; 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); gfs2_set_inode_flags(&ip->i_inode); 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); clear_bit(GIF_INVALID, &ip->i_flags); 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(diff != 1 && diff != -1); nlink = ip->i_inode.i_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_inode.i_nlink) { if (gfs2_consist_inode(ip)) gfs2_dinode_print(ip); return -EIO; } error = gfs2_meta_inode_buffer(ip, &dibh); if (error) return error; if (diff > 0) inc_nlink(&ip->i_inode); else drop_nlink(&ip->i_inode); ip->i_inode.i_ctime.tv_sec = get_seconds(); 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_inode.i_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; 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_inode.i_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_inode.i_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 = 0; di->di_size = 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 = 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(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; 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_inode.i_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; /* It looks odd, but it really should be done twice */ error = gfs2_change_nlink(ip, -1); if (error) return error; error = gfs2_change_nlink(ip, -1); if (error) return error; return error; } /* * gfs2_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_inode.i_atime.tv_sec >= 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_inode.i_atime.tv_sec >= 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_inode.i_atime.tv_sec = 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_inode.i_atime.tv_sec); 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; } 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_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; }