X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=fs%2Fgfs2%2Finode.c;fp=fs%2Fgfs2%2Finode.c;h=df0b8b3018b934e72a30830b5a2936498c969be9;hb=76828883507a47dae78837ab5dec5a5b4513c667;hp=0000000000000000000000000000000000000000;hpb=64ba3f394c830ec48a1c31b53dcae312c56f1604;p=linux-2.6.git diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c new file mode 100644 index 000000000..df0b8b301 --- /dev/null +++ b/fs/gfs2/inode.c @@ -0,0 +1,1254 @@ +/* + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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 && + inode->i_private != NULL) + 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_addr, + 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_addr, + 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 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 = CURRENT_TIME_SEC; + + 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) + gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */ + + return error; +} + +struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) +{ + struct qstr qstr; + struct inode *inode; + gfs2_str2qstr(&qstr, name); + inode = gfs2_lookupi(dip, &qstr, 1, NULL); + /* gfs2_lookupi has inconsistent callers: vfs + * related routines expect NULL for no entry found, + * gfs2_lookup_simple callers expect ENOENT + * and do not check for NULL. + */ + if (inode == NULL) + return ERR_PTR(-ENOENT); + else + return inode; +} + + +/** + * 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 + * + * This can be called via the VFS filldir function when NFS is doing + * a readdirplus and the inode which its intending to stat isn't + * already in cache. In this case we must not take the directory glock + * again, since the readdir call will have already taken that lock. + * + * 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; + struct inode *inode = NULL; + int unlock = 0; + + 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; + } + + if (gfs2_glock_is_locked_by_me(dip->i_gl) == 0) { + error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); + if (error) + return ERR_PTR(error); + unlock = 1; + } + + 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: + if (unlock) + gfs2_glock_dq_uninit(&d_gh); + if (error == -ENOENT) + return NULL; + return inode ? inode : ERR_PTR(error); +} + +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; + + 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; +} +