/* * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. * * This copyrighted material is made available to anyone wishing to use, * modify, copy, or redistribute it subject to the terms and conditions * of the GNU General Public License v.2. */ #include <linux/sched.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/completion.h> #include <linux/buffer_head.h> #include <linux/posix_acl.h> #include <linux/sort.h> #include <asm/semaphore.h> #include "gfs2.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 "unlinked.h" /** * 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 * */ static void inode_attr_in(struct gfs2_inode *ip, struct inode *inode) { inode->i_ino = ip->i_num.no_formal_ino; switch (ip->i_di.di_mode & S_IFMT) { case S_IFBLK: case S_IFCHR: inode->i_rdev = MKDEV(ip->i_di.di_major, ip->i_di.di_minor); break; default: inode->i_rdev = 0; break; }; inode->i_mode = ip->i_di.di_mode; inode->i_nlink = ip->i_di.di_nlink; inode->i_uid = ip->i_di.di_uid; inode->i_gid = ip->i_di.di_gid; i_size_write(inode, ip->i_di.di_size); inode->i_atime.tv_sec = ip->i_di.di_atime; inode->i_mtime.tv_sec = ip->i_di.di_mtime; inode->i_ctime.tv_sec = ip->i_di.di_ctime; inode->i_atime.tv_nsec = 0; inode->i_mtime.tv_nsec = 0; inode->i_ctime.tv_nsec = 0; inode->i_blksize = PAGE_SIZE; inode->i_blocks = ip->i_di.di_blocks << (ip->i_sbd->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT); if (ip->i_di.di_flags & GFS2_DIF_IMMUTABLE) inode->i_flags |= S_IMMUTABLE; else inode->i_flags &= ~S_IMMUTABLE; if (ip->i_di.di_flags & GFS2_DIF_APPENDONLY) inode->i_flags |= S_APPEND; else inode->i_flags &= ~S_APPEND; } /** * gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode * @ip: The GFS2 inode (with embedded disk inode data) * */ void gfs2_inode_attr_in(struct gfs2_inode *ip) { struct inode *inode; inode = gfs2_ip2v_lookup(ip); if (inode) { inode_attr_in(ip, inode); iput(inode); } } /** * 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_vnode; gfs2_assert_withdraw(ip->i_sbd, (ip->i_di.di_mode & S_IFMT) == (inode->i_mode & S_IFMT)); ip->i_di.di_mode = inode->i_mode; ip->i_di.di_uid = inode->i_uid; ip->i_di.di_gid = inode->i_gid; ip->i_di.di_atime = inode->i_atime.tv_sec; ip->i_di.di_mtime = inode->i_mtime.tv_sec; ip->i_di.di_ctime = inode->i_ctime.tv_sec; } /** * gfs2_ip2v_lookup - Get the struct inode for a struct gfs2_inode * @ip: the struct gfs2_inode to get the struct inode for * * Returns: A VFS inode, or NULL if none */ struct inode *gfs2_ip2v_lookup(struct gfs2_inode *ip) { struct inode *inode = NULL; gfs2_assert_warn(ip->i_sbd, test_bit(GIF_MIN_INIT, &ip->i_flags)); spin_lock(&ip->i_spin); if (ip->i_vnode) inode = igrab(ip->i_vnode); spin_unlock(&ip->i_spin); return inode; } /** * gfs2_ip2v - Get/Create a struct inode for a struct gfs2_inode * @ip: the struct gfs2_inode to get the struct inode for * * Returns: A VFS inode, or NULL if no mem */ struct inode *gfs2_ip2v(struct gfs2_inode *ip) { struct inode *inode, *tmp; inode = gfs2_ip2v_lookup(ip); if (inode) return inode; tmp = new_inode(ip->i_sbd->sd_vfs); if (!tmp) return NULL; inode_attr_in(ip, tmp); if (S_ISREG(ip->i_di.di_mode)) { tmp->i_op = &gfs2_file_iops; tmp->i_fop = &gfs2_file_fops; tmp->i_mapping->a_ops = &gfs2_file_aops; } else if (S_ISDIR(ip->i_di.di_mode)) { tmp->i_op = &gfs2_dir_iops; tmp->i_fop = &gfs2_dir_fops; } else if (S_ISLNK(ip->i_di.di_mode)) { tmp->i_op = &gfs2_symlink_iops; } else { tmp->i_op = &gfs2_dev_iops; init_special_inode(tmp, tmp->i_mode, tmp->i_rdev); } set_v2ip(tmp, NULL); for (;;) { spin_lock(&ip->i_spin); if (!ip->i_vnode) break; inode = igrab(ip->i_vnode); spin_unlock(&ip->i_spin); if (inode) { iput(tmp); return inode; } yield(); } inode = tmp; gfs2_inode_hold(ip); ip->i_vnode = inode; set_v2ip(inode, ip); spin_unlock(&ip->i_spin); insert_inode_hash(inode); return inode; } static int iget_test(struct inode *inode, void *opaque) { struct gfs2_inode *ip = get_v2ip(inode); struct gfs2_inum *inum = (struct gfs2_inum *)opaque; if (ip && ip->i_num.no_addr == inum->no_addr) return 1; return 0; } struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum *inum) { return ilookup5(sb, (unsigned long)inum->no_formal_ino, iget_test, inum); } void gfs2_inode_min_init(struct gfs2_inode *ip, unsigned int type) { spin_lock(&ip->i_spin); if (!test_and_set_bit(GIF_MIN_INIT, &ip->i_flags)) { ip->i_di.di_nlink = 1; ip->i_di.di_mode = DT2IF(type); } spin_unlock(&ip->i_spin); } /** * 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(ip->i_sbd, dibh, GFS2_METATYPE_DI)) { brelse(dibh); return -EIO; } spin_lock(&ip->i_spin); gfs2_dinode_in(&ip->i_di, dibh->b_data); set_bit(GIF_MIN_INIT, &ip->i_flags); spin_unlock(&ip->i_spin); brelse(dibh); if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) { if (gfs2_consist_inode(ip)) gfs2_dinode_print(&ip->i_di); return -EIO; } if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino) return -ESTALE; ip->i_vn = ip->i_gl->gl_vn; return 0; } /** * inode_create - create a struct gfs2_inode * @i_gl: The glock covering the inode * @inum: The inode number * @io_gl: the iopen glock to acquire/hold (using holder in new gfs2_inode) * @io_state: the state the iopen glock should be acquired in * @ipp: pointer to put the returned inode in * * Returns: errno */ static int inode_create(struct gfs2_glock *i_gl, struct gfs2_inum *inum, struct gfs2_glock *io_gl, unsigned int io_state, struct gfs2_inode **ipp) { struct gfs2_sbd *sdp = i_gl->gl_sbd; struct gfs2_inode *ip; int error = 0; ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL); if (!ip) return -ENOMEM; memset(ip, 0, sizeof(struct gfs2_inode)); ip->i_num = *inum; atomic_set(&ip->i_count, 1); ip->i_vn = i_gl->gl_vn - 1; ip->i_gl = i_gl; ip->i_sbd = sdp; spin_lock_init(&ip->i_spin); init_rwsem(&ip->i_rw_mutex); ip->i_greedy = gfs2_tune_get(sdp, gt_greedy_default); error = gfs2_glock_nq_init(io_gl, io_state, GL_LOCAL_EXCL | GL_EXACT, &ip->i_iopen_gh); if (error) goto fail; ip->i_iopen_gh.gh_owner = NULL; spin_lock(&io_gl->gl_spin); gfs2_glock_hold(i_gl); set_gl2gl(io_gl, i_gl); spin_unlock(&io_gl->gl_spin); gfs2_glock_hold(i_gl); set_gl2ip(i_gl, ip); atomic_inc(&sdp->sd_inode_count); *ipp = ip; return 0; fail: gfs2_meta_cache_flush(ip); kmem_cache_free(gfs2_inode_cachep, ip); *ipp = NULL; return error; } /** * gfs2_inode_get - Create or get a reference on an inode * @i_gl: The glock covering the inode * @inum: The inode number * @create: * @ipp: pointer to put the returned inode in * * Returns: errno */ int gfs2_inode_get(struct gfs2_glock *i_gl, struct gfs2_inum *inum, int create, struct gfs2_inode **ipp) { struct gfs2_sbd *sdp = i_gl->gl_sbd; struct gfs2_glock *io_gl; int error = 0; gfs2_glmutex_lock(i_gl); *ipp = get_gl2ip(i_gl); if (*ipp) { error = -ESTALE; if ((*ipp)->i_num.no_formal_ino != inum->no_formal_ino) goto out; atomic_inc(&(*ipp)->i_count); error = 0; goto out; } if (!create) goto out; error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl); if (!error) { error = inode_create(i_gl, inum, io_gl, LM_ST_SHARED, ipp); gfs2_glock_put(io_gl); } out: gfs2_glmutex_unlock(i_gl); return error; } void gfs2_inode_hold(struct gfs2_inode *ip) { gfs2_assert(ip->i_sbd, atomic_read(&ip->i_count) > 0); atomic_inc(&ip->i_count); } void gfs2_inode_put(struct gfs2_inode *ip) { gfs2_assert(ip->i_sbd, atomic_read(&ip->i_count) > 0); atomic_dec(&ip->i_count); } void gfs2_inode_destroy(struct gfs2_inode *ip) { struct gfs2_sbd *sdp = ip->i_sbd; struct gfs2_glock *io_gl = ip->i_iopen_gh.gh_gl; struct gfs2_glock *i_gl = ip->i_gl; gfs2_assert_warn(sdp, !atomic_read(&ip->i_count)); gfs2_assert(sdp, get_gl2gl(io_gl) == i_gl); spin_lock(&io_gl->gl_spin); set_gl2gl(io_gl, NULL); gfs2_glock_put(i_gl); spin_unlock(&io_gl->gl_spin); gfs2_glock_dq_uninit(&ip->i_iopen_gh); gfs2_meta_cache_flush(ip); kmem_cache_free(gfs2_inode_cachep, ip); set_gl2ip(i_gl, NULL); gfs2_glock_put(i_gl); atomic_dec(&sdp->sd_inode_count); } static int dinode_dealloc(struct gfs2_inode *ip, struct gfs2_unlinked *ul) { struct gfs2_sbd *sdp = ip->i_sbd; 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->i_di); 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_UNLINKED + RES_STATFS + RES_QUOTA, 1); if (error) goto out_rg_gunlock; gfs2_trans_add_gl(ip->i_gl); gfs2_free_di(rgd, ip); error = gfs2_unlinked_ondisk_rm(sdp, ul); 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; } /** * inode_dealloc - Deallocate all on-disk blocks for an inode (dinode) * @sdp: the filesystem * @inum: the inode number to deallocate * @io_gh: a holder for the iopen glock for this inode * * Returns: errno */ static int inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul, struct gfs2_holder *io_gh) { struct gfs2_inode *ip; struct gfs2_holder i_gh; int error; error = gfs2_glock_nq_num(sdp, ul->ul_ut.ut_inum.no_addr, &gfs2_inode_glops, LM_ST_EXCLUSIVE, 0, &i_gh); if (error) return error; /* We reacquire the iopen lock here to avoid a race with the NFS server calling gfs2_read_inode() with the inode number of a inode we're in the process of deallocating. And we can't keep our hold on the lock from inode_dealloc_init() for deadlock reasons. */ gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY, io_gh); error = gfs2_glock_nq(io_gh); switch (error) { case 0: break; case GLR_TRYFAILED: error = 1; default: goto out; } gfs2_assert_warn(sdp, !get_gl2ip(i_gh.gh_gl)); error = inode_create(i_gh.gh_gl, &ul->ul_ut.ut_inum, io_gh->gh_gl, LM_ST_EXCLUSIVE, &ip); gfs2_glock_dq(io_gh); if (error) goto out; error = gfs2_inode_refresh(ip); if (error) goto out_iput; if (ip->i_di.di_nlink) { if (gfs2_consist_inode(ip)) gfs2_dinode_print(&ip->i_di); error = -EIO; goto out_iput; } if (S_ISDIR(ip->i_di.di_mode) && (ip->i_di.di_flags & GFS2_DIF_EXHASH)) { error = gfs2_dir_exhash_dealloc(ip); if (error) goto out_iput; } if (ip->i_di.di_eattr) { error = gfs2_ea_dealloc(ip); if (error) goto out_iput; } if (!gfs2_is_stuffed(ip)) { error = gfs2_file_dealloc(ip); if (error) goto out_iput; } error = dinode_dealloc(ip, ul); if (error) goto out_iput; out_iput: gfs2_glmutex_lock(i_gh.gh_gl); gfs2_inode_put(ip); gfs2_inode_destroy(ip); gfs2_glmutex_unlock(i_gh.gh_gl); out: gfs2_glock_dq_uninit(&i_gh); return error; } /** * try_inode_dealloc - Try to deallocate an inode and all its blocks * @sdp: the filesystem * * Returns: 0 on success, -errno on error, 1 on busy (inode open) */ static int try_inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul) { struct gfs2_holder io_gh; int error = 0; gfs2_try_toss_inode(sdp, &ul->ul_ut.ut_inum); error = gfs2_glock_nq_num(sdp, ul->ul_ut.ut_inum.no_addr, &gfs2_iopen_glops, LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB, &io_gh); switch (error) { case 0: break; case GLR_TRYFAILED: return 1; default: return error; } gfs2_glock_dq(&io_gh); error = inode_dealloc(sdp, ul, &io_gh); gfs2_holder_uninit(&io_gh); return error; } static int inode_dealloc_uninit(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul) { struct gfs2_rgrpd *rgd; struct gfs2_holder ri_gh, rgd_gh; int error; error = gfs2_rindex_hold(sdp, &ri_gh); if (error) return error; rgd = gfs2_blk2rgrpd(sdp, ul->ul_ut.ut_inum.no_addr); if (!rgd) { gfs2_consist(sdp); error = -EIO; goto out; } error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rgd_gh); if (error) goto out; error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_UNLINKED + RES_STATFS, 0); if (error) goto out_gunlock; gfs2_free_uninit_di(rgd, ul->ul_ut.ut_inum.no_addr); gfs2_unlinked_ondisk_rm(sdp, ul); gfs2_trans_end(sdp); out_gunlock: gfs2_glock_dq_uninit(&rgd_gh); out: gfs2_glock_dq_uninit(&ri_gh); return error; } int gfs2_inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul) { if (ul->ul_ut.ut_flags & GFS2_UTF_UNINIT) return inode_dealloc_uninit(sdp, ul); else return try_inode_dealloc(sdp, ul); } /** * 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 buffer_head *dibh; uint32_t nlink; int error; 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->i_di); 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(); gfs2_trans_add_bh(ip->i_gl, dibh, 1); gfs2_dinode_out(&ip->i_di, dibh->b_data); brelse(dibh); return 0; } /** * 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 */ int gfs2_lookupi(struct inode *dir, struct qstr *name, int is_root, struct inode **inodep) { struct gfs2_inode *ipp; struct gfs2_inode *dip = get_v2ip(dir); struct gfs2_sbd *sdp = dip->i_sbd; struct gfs2_holder d_gh; struct gfs2_inum inum; unsigned int type; struct gfs2_glock *gl; int error = 0; *inodep = NULL; if (!name->len || name->len > GFS2_FNAMESIZE) return -ENAMETOOLONG; if (gfs2_filecmp(name, ".", 1) || (gfs2_filecmp(name, "..", 2) && dir == sdp->sd_root_dir)) { gfs2_inode_hold(dip); ipp = dip; goto done; } error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); if (error) return error; if (!is_root) { error = gfs2_repermission(dip->i_vnode, MAY_EXEC, NULL); if (error) goto out; } error = gfs2_dir_search(dip, name, &inum, &type); if (error) goto out; error = gfs2_glock_get(sdp, inum.no_addr, &gfs2_inode_glops, CREATE, &gl); if (error) goto out; error = gfs2_inode_get(gl, &inum, CREATE, &ipp); if (!error) gfs2_inode_min_init(ipp, type); gfs2_glock_put(gl); out: gfs2_glock_dq_uninit(&d_gh); done: if (error == 0) { *inodep = gfs2_ip2v(ipp); if (!*inodep) error = -ENOMEM; gfs2_inode_put(ipp); } return error; } static int pick_formal_ino_1(struct gfs2_sbd *sdp, uint64_t *formal_ino) { struct gfs2_inode *ip = get_v2ip(sdp->sd_ir_inode); struct buffer_head *bh; struct gfs2_inum_range 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, uint64_t *formal_ino) { struct gfs2_inode *ip = get_v2ip(sdp->sd_ir_inode); struct gfs2_inode *m_ip = get_v2ip(sdp->sd_inum_inode); struct gfs2_holder gh; struct buffer_head *bh; struct gfs2_inum_range 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; uint64_t x, y; error = gfs2_meta_inode_buffer(m_ip, &m_bh); if (error) goto out_brelse; x = *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)); x = y = be64_to_cpu(x); ir.ir_start = x; ir.ir_length = GFS2_INUM_QUANTUM; x += GFS2_INUM_QUANTUM; if (x < y) gfs2_consist_inode(m_ip); x = cpu_to_be64(x); gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x; 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, uint64_t *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, struct qstr *name, unsigned int mode) { int error; error = gfs2_repermission(dip->i_vnode, 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, name, NULL, NULL); switch (error) { case -ENOENT: error = 0; break; case 0: return -EEXIST; default: return error; } if (dip->i_di.di_entries == (uint32_t)-1) return -EFBIG; if (S_ISDIR(mode) && dip->i_di.di_nlink == (uint32_t)-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 (dip->i_sbd->sd_args.ar_suiddir && (dip->i_di.di_mode & S_ISUID) && dip->i_di.di_uid) { if (S_ISDIR(*mode)) *mode |= S_ISUID; else if (dip->i_di.di_uid != current->fsuid) *mode &= ~07111; *uid = dip->i_di.di_uid; } else *uid = current->fsuid; if (dip->i_di.di_mode & S_ISGID) { if (S_ISDIR(*mode)) *mode |= S_ISGID; *gid = dip->i_di.di_gid; } else *gid = current->fsgid; } static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_unlinked *ul) { struct gfs2_sbd *sdp = dip->i_sbd; 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_UNLINKED + RES_STATFS, 0); if (error) goto out_ipreserv; ul->ul_ut.ut_inum.no_addr = gfs2_alloc_di(dip); ul->ul_ut.ut_flags = GFS2_UTF_UNINIT; error = gfs2_unlinked_ondisk_add(sdp, ul); 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, struct gfs2_inum *inum, unsigned int mode, unsigned int uid, unsigned int gid) { struct gfs2_sbd *sdp = dip->i_sbd; 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 = di->di_minor = cpu_to_be32(0); di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); di->__pad[0] = di->__pad[1] = 0; 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_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, struct gfs2_unlinked *ul) { struct gfs2_sbd *sdp = dip->i_sbd; 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_UNLINKED + RES_QUOTA, 0); if (error) goto out_quota; ul->ul_ut.ut_flags = 0; error = gfs2_unlinked_ondisk_munge(sdp, ul); init_dinode(dip, gl, &ul->ul_ut.ut_inum, mode, uid, gid); 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, struct qstr *name, struct gfs2_inode *ip, struct gfs2_unlinked *ul) { struct gfs2_sbd *sdp = dip->i_sbd; 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 = gfs2_diradd_alloc_required(dip, name, &alloc_required); if (alloc_required) { error = gfs2_quota_check(dip, dip->i_di.di_uid, dip->i_di.di_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_UNLINKED + RES_STATFS + RES_QUOTA, 0); if (error) goto fail_ipreserv; } else { error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE + RES_UNLINKED, 0); if (error) goto fail_quota_locks; } error = gfs2_dir_add(dip, name, &ip->i_num, IF2DT(ip->i_di.di_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->i_di, dibh->b_data); brelse(dibh); error = gfs2_unlinked_ondisk_rm(sdp, ul); if (error) goto fail_end_trans; 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; } /** * 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, struct qstr *name, unsigned int mode) { struct inode *inode; struct gfs2_inode *dip = get_gl2ip(ghs->gh_gl); struct gfs2_sbd *sdp = dip->i_sbd; struct gfs2_unlinked *ul; struct gfs2_inode *ip; int error; if (!name->len || name->len > GFS2_FNAMESIZE) return ERR_PTR(-ENAMETOOLONG); error = gfs2_unlinked_get(sdp, &ul); if (error) return ERR_PTR(error); 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, &ul->ul_ut.ut_inum.no_formal_ino); if (error) goto fail_gunlock; error = alloc_dinode(dip, ul); if (error) goto fail_gunlock; if (ul->ul_ut.ut_inum.no_addr < dip->i_num.no_addr) { gfs2_glock_dq(ghs); error = gfs2_glock_nq_num(sdp, ul->ul_ut.ut_inum.no_addr, &gfs2_inode_glops, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); if (error) { gfs2_unlinked_put(sdp, ul); 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); gfs2_unlinked_put(sdp, ul); return ERR_PTR(error); } error = create_ok(dip, name, mode); if (error) goto fail_gunlock2; } else { error = gfs2_glock_nq_num(sdp, ul->ul_ut.ut_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, ul); if (error) goto fail_gunlock2; error = gfs2_inode_get(ghs[1].gh_gl, &ul->ul_ut.ut_inum, CREATE, &ip); if (error) goto fail_gunlock2; error = gfs2_inode_refresh(ip); if (error) goto fail_iput; error = gfs2_acl_create(dip, ip); if (error) goto fail_iput; error = link_dinode(dip, name, ip, ul); if (error) goto fail_iput; gfs2_unlinked_put(sdp, ul); inode = gfs2_ip2v(ip); gfs2_inode_put(ip); if (!inode) return ERR_PTR(-ENOMEM); return inode; fail_iput: gfs2_inode_put(ip); fail_gunlock2: gfs2_glock_dq_uninit(ghs + 1); fail_gunlock: gfs2_glock_dq(ghs); fail: gfs2_unlinked_put(sdp, ul); return ERR_PTR(error); } /** * gfs2_unlinki - Unlink a file * @dip: The inode of the directory * @name: The name of the file to be unlinked * @ip: The inode of the file to be removed * * Assumes Glocks on both dip and ip are held. * * Returns: errno */ int gfs2_unlinki(struct gfs2_inode *dip, struct qstr *name, struct gfs2_inode *ip, struct gfs2_unlinked *ul) { struct gfs2_sbd *sdp = dip->i_sbd; int error; error = gfs2_dir_del(dip, name); if (error) return error; error = gfs2_change_nlink(ip, -1); if (error) return error; /* If this inode is being unlinked from the directory structure, we need to mark that in the log so that it isn't lost during a crash. */ if (!ip->i_di.di_nlink) { ul->ul_ut.ut_inum = ip->i_num; error = gfs2_unlinked_ondisk_add(sdp, ul); if (!error) set_bit(GLF_STICKY, &ip->i_gl->gl_flags); } return 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, struct qstr *name, struct gfs2_inode *ip, struct gfs2_unlinked *ul) { struct gfs2_sbd *sdp = dip->i_sbd; struct qstr dotname; int error; if (ip->i_di.di_entries != 2) { if (gfs2_consist_inode(ip)) gfs2_dinode_print(&ip->i_di); return -EIO; } error = gfs2_dir_del(dip, name); if (error) return error; error = gfs2_change_nlink(dip, -1); if (error) return error; dotname.len = 1; dotname.name = "."; error = gfs2_dir_del(ip, &dotname); if (error) return error; dotname.len = 2; dotname.name = ".."; error = gfs2_dir_del(ip, &dotname); if (error) return error; error = gfs2_change_nlink(ip, -2); if (error) return error; /* This inode is being unlinked from the directory structure and we need to mark that in the log so that it isn't lost during a crash. */ ul->ul_ut.ut_inum = ip->i_num; error = gfs2_unlinked_ondisk_add(sdp, ul); if (!error) set_bit(GLF_STICKY, &ip->i_gl->gl_flags); 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, struct qstr *name, struct gfs2_inode *ip) { struct gfs2_inum inum; unsigned int type; int error; if (IS_IMMUTABLE(ip->i_vnode) || IS_APPEND(ip->i_vnode)) return -EPERM; if ((dip->i_di.di_mode & S_ISVTX) && dip->i_di.di_uid != current->fsuid && ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER)) return -EPERM; if (IS_APPEND(dip->i_vnode)) return -EPERM; error = gfs2_repermission(dip->i_vnode, MAY_WRITE | MAY_EXEC, NULL); if (error) return error; error = gfs2_dir_search(dip, name, &inum, &type); if (error) return error; if (!gfs2_inum_equal(&inum, &ip->i_num)) return -ENOENT; if (IF2DT(ip->i_di.di_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 gfs2_sbd *sdp = this->i_sbd; struct inode *dir = to->i_vnode; struct inode *tmp; struct qstr dotdot; int error = 0; memset(&dotdot, 0, sizeof(struct qstr)); dotdot.name = ".."; dotdot.len = 2; igrab(dir); for (;;) { if (dir == this->i_vnode) { error = -EINVAL; break; } if (dir == sdp->sd_root_dir) { error = 0; break; } error = gfs2_lookupi(dir, &dotdot, 1, &tmp); if (error) 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 = get_gl2ip(gl); int64_t 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; 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); gfs2_dinode_out(&ip->i_di, dibh->b_data); 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) { struct gfs2_holder *gh_a = *(struct gfs2_holder **)arg_a; struct gfs2_holder *gh_b = *(struct gfs2_holder **)arg_b; struct lm_lockname *a = &gh_a->gh_gl->gl_name; struct lm_lockname *b = &gh_b->gh_gl->gl_name; int ret = 0; if (a->ln_number > b->ln_number) ret = 1; else if (a->ln_number < b->ln_number) ret = -1; else { if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE) ret = 1; else if (gh_a->gh_state == LM_ST_SHARED && (gh_b->gh_flags & GL_ATIME)) ret = 1; } return ret; } /** * 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; } /** * gfs2_try_toss_vnode - See if we can toss a vnode from memory * @ip: the inode * * Returns: 1 if the vnode was tossed */ void gfs2_try_toss_vnode(struct gfs2_inode *ip) { struct inode *inode; inode = gfs2_ip2v_lookup(ip); if (!inode) return; d_prune_aliases(inode); if (S_ISDIR(ip->i_di.di_mode)) { struct list_head *head = &inode->i_dentry; struct dentry *d = NULL; spin_lock(&dcache_lock); if (list_empty(head)) spin_unlock(&dcache_lock); else { d = list_entry(head->next, struct dentry, d_alias); dget_locked(d); spin_unlock(&dcache_lock); if (have_submounts(d)) dput(d); else { shrink_dcache_parent(d); dput(d); d_prune_aliases(inode); } } } inode->i_nlink = 0; iput(inode); } 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_vnode, attr); gfs2_assert_warn(ip->i_sbd, !error); gfs2_inode_attr_out(ip); gfs2_trans_add_bh(ip->i_gl, dibh, 1); gfs2_dinode_out(&ip->i_di, dibh->b_data); brelse(dibh); } 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 (get_transaction) return __gfs2_setattr_simple(ip, attr); error = gfs2_trans_begin(ip->i_sbd, RES_DINODE, 0); if (error) return error; error = __gfs2_setattr_simple(ip, attr); gfs2_trans_end(ip->i_sbd); return error; } int gfs2_repermission(struct inode *inode, int mask, struct nameidata *nd) { return permission(inode, mask, nd); }