/* * 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/slab.h> #include <linux/spinlock.h> #include <linux/completion.h> #include <linux/buffer_head.h> #include <linux/namei.h> #include <linux/utsname.h> #include <linux/mm.h> #include <linux/xattr.h> #include <linux/posix_acl.h> #include <linux/gfs2_ondisk.h> #include <linux/crc32.h> #include <linux/fiemap.h> #include <asm/uaccess.h> #include "gfs2.h" #include "incore.h" #include "acl.h" #include "bmap.h" #include "dir.h" #include "xattr.h" #include "glock.h" #include "inode.h" #include "meta_io.h" #include "quota.h" #include "rgrp.h" #include "trans.h" #include "util.h" #include "super.h" /** * gfs2_create - Create a file * @dir: The directory in which to create the file * @dentry: The dentry of the new file * @mode: The mode of the new file * * Returns: errno */ static int gfs2_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd) { struct gfs2_inode *dip = GFS2_I(dir); struct gfs2_sbd *sdp = GFS2_SB(dir); struct gfs2_holder ghs[2]; struct inode *inode; gfs2_holder_init(dip->i_gl, 0, 0, ghs); for (;;) { inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode, 0); if (!IS_ERR(inode)) { gfs2_trans_end(sdp); if (dip->i_alloc->al_rgd) gfs2_inplace_release(dip); gfs2_quota_unlock(dip); gfs2_alloc_put(dip); gfs2_glock_dq_uninit_m(2, ghs); mark_inode_dirty(inode); break; } else if (PTR_ERR(inode) != -EEXIST || (nd && nd->flags & LOOKUP_EXCL)) { gfs2_holder_uninit(ghs); return PTR_ERR(inode); } inode = gfs2_lookupi(dir, &dentry->d_name, 0); if (inode) { if (!IS_ERR(inode)) { gfs2_holder_uninit(ghs); break; } else { gfs2_holder_uninit(ghs); return PTR_ERR(inode); } } } d_instantiate(dentry, inode); return 0; } /** * gfs2_lookup - Look up a filename in a directory and return its inode * @dir: The directory inode * @dentry: The dentry of the new inode * @nd: passed from Linux VFS, ignored by us * * Called by the VFS layer. Lock dir and call gfs2_lookupi() * * Returns: errno */ static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) { struct inode *inode = NULL; dentry->d_op = &gfs2_dops; inode = gfs2_lookupi(dir, &dentry->d_name, 0); if (inode && IS_ERR(inode)) return ERR_CAST(inode); if (inode) { struct gfs2_glock *gl = GFS2_I(inode)->i_gl; struct gfs2_holder gh; int error; error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); if (error) { iput(inode); return ERR_PTR(error); } gfs2_glock_dq_uninit(&gh); return d_splice_alias(inode, dentry); } d_add(dentry, inode); return NULL; } /** * gfs2_link - Link to a file * @old_dentry: The inode to link * @dir: Add link to this directory * @dentry: The name of the link * * Link the inode in "old_dentry" into the directory "dir" with the * name in "dentry". * * Returns: errno */ static int gfs2_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) { struct gfs2_inode *dip = GFS2_I(dir); struct gfs2_sbd *sdp = GFS2_SB(dir); struct inode *inode = old_dentry->d_inode; struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_holder ghs[2]; int alloc_required; int error; if (S_ISDIR(inode->i_mode)) return -EPERM; gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); error = gfs2_glock_nq(ghs); /* parent */ if (error) goto out_parent; error = gfs2_glock_nq(ghs + 1); /* child */ if (error) goto out_child; error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); if (error) goto out_gunlock; error = gfs2_dir_check(dir, &dentry->d_name, NULL); switch (error) { case -ENOENT: break; case 0: error = -EEXIST; default: goto out_gunlock; } error = -EINVAL; if (!dip->i_inode.i_nlink) goto out_gunlock; error = -EFBIG; if (dip->i_entries == (u32)-1) goto out_gunlock; error = -EPERM; if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) goto out_gunlock; error = -EINVAL; if (!ip->i_inode.i_nlink) goto out_gunlock; error = -EMLINK; if (ip->i_inode.i_nlink == (u32)-1) goto out_gunlock; alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name); if (error < 0) goto out_gunlock; error = 0; if (alloc_required) { struct gfs2_alloc *al = gfs2_alloc_get(dip); if (!al) { error = -ENOMEM; goto out_gunlock; } error = gfs2_quota_lock_check(dip); if (error) goto out_alloc; al->al_requested = sdp->sd_max_dirres; error = gfs2_inplace_reserve(dip); if (error) goto out_gunlock_q; error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + al->al_rgd->rd_length + 2 * RES_DINODE + RES_STATFS + RES_QUOTA, 0); if (error) goto out_ipres; } else { error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); if (error) goto out_ipres; } error = gfs2_dir_add(dir, &dentry->d_name, ip, IF2DT(inode->i_mode)); if (error) goto out_end_trans; error = gfs2_change_nlink(ip, +1); out_end_trans: gfs2_trans_end(sdp); out_ipres: if (alloc_required) gfs2_inplace_release(dip); out_gunlock_q: if (alloc_required) gfs2_quota_unlock(dip); out_alloc: if (alloc_required) gfs2_alloc_put(dip); out_gunlock: gfs2_glock_dq(ghs + 1); out_child: gfs2_glock_dq(ghs); out_parent: gfs2_holder_uninit(ghs); gfs2_holder_uninit(ghs + 1); if (!error) { atomic_inc(&inode->i_count); d_instantiate(dentry, inode); mark_inode_dirty(inode); } return error; } /* * gfs2_unlink_ok - check to see that a inode is still in a directory * @dip: the directory * @name: the name of the file * @ip: the inode * * Assumes that the lock on (at least) @dip is held. * * Returns: 0 if the parent/child relationship is correct, errno if it isn't */ static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, const struct gfs2_inode *ip) { int error; if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) return -EPERM; if ((dip->i_inode.i_mode & S_ISVTX) && dip->i_inode.i_uid != current_fsuid() && ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER)) return -EPERM; if (IS_APPEND(&dip->i_inode)) return -EPERM; error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); if (error) return error; error = gfs2_dir_check(&dip->i_inode, name, ip); if (error) return error; return 0; } /** * gfs2_unlink - Unlink a file * @dir: The inode of the directory containing the file to unlink * @dentry: The file itself * * Unlink a file. Call gfs2_unlinki() * * Returns: errno */ static int gfs2_unlink(struct inode *dir, struct dentry *dentry) { struct gfs2_inode *dip = GFS2_I(dir); struct gfs2_sbd *sdp = GFS2_SB(dir); struct gfs2_inode *ip = GFS2_I(dentry->d_inode); struct gfs2_holder ghs[3]; struct gfs2_rgrpd *rgd; struct gfs2_holder ri_gh; int error; error = gfs2_rindex_hold(sdp, &ri_gh); if (error) return error; gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr); gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); error = gfs2_glock_nq(ghs); /* parent */ if (error) goto out_parent; error = gfs2_glock_nq(ghs + 1); /* child */ if (error) goto out_child; error = gfs2_glock_nq(ghs + 2); /* rgrp */ if (error) goto out_rgrp; error = gfs2_unlink_ok(dip, &dentry->d_name, ip); if (error) goto out_gunlock; error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0); if (error) goto out_gunlock; error = gfs2_dir_del(dip, &dentry->d_name); if (error) goto out_end_trans; error = gfs2_change_nlink(ip, -1); out_end_trans: gfs2_trans_end(sdp); out_gunlock: gfs2_glock_dq(ghs + 2); out_rgrp: gfs2_holder_uninit(ghs + 2); gfs2_glock_dq(ghs + 1); out_child: gfs2_holder_uninit(ghs + 1); gfs2_glock_dq(ghs); out_parent: gfs2_holder_uninit(ghs); gfs2_glock_dq_uninit(&ri_gh); return error; } /** * gfs2_symlink - Create a symlink * @dir: The directory to create the symlink in * @dentry: The dentry to put the symlink in * @symname: The thing which the link points to * * Returns: errno */ static int gfs2_symlink(struct inode *dir, struct dentry *dentry, const char *symname) { struct gfs2_inode *dip = GFS2_I(dir), *ip; struct gfs2_sbd *sdp = GFS2_SB(dir); struct gfs2_holder ghs[2]; struct inode *inode; struct buffer_head *dibh; int size; int error; /* Must be stuffed with a null terminator for gfs2_follow_link() */ size = strlen(symname); if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) return -ENAMETOOLONG; gfs2_holder_init(dip->i_gl, 0, 0, ghs); inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0); if (IS_ERR(inode)) { gfs2_holder_uninit(ghs); return PTR_ERR(inode); } ip = ghs[1].gh_gl->gl_object; ip->i_disksize = size; i_size_write(inode, size); error = gfs2_meta_inode_buffer(ip, &dibh); if (!gfs2_assert_withdraw(sdp, !error)) { gfs2_dinode_out(ip, dibh->b_data); memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, size); brelse(dibh); } gfs2_trans_end(sdp); if (dip->i_alloc->al_rgd) gfs2_inplace_release(dip); gfs2_quota_unlock(dip); gfs2_alloc_put(dip); gfs2_glock_dq_uninit_m(2, ghs); d_instantiate(dentry, inode); mark_inode_dirty(inode); return 0; } /** * gfs2_mkdir - Make a directory * @dir: The parent directory of the new one * @dentry: The dentry of the new directory * @mode: The mode of the new directory * * Returns: errno */ static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode) { struct gfs2_inode *dip = GFS2_I(dir), *ip; struct gfs2_sbd *sdp = GFS2_SB(dir); struct gfs2_holder ghs[2]; struct inode *inode; struct buffer_head *dibh; int error; gfs2_holder_init(dip->i_gl, 0, 0, ghs); inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0); if (IS_ERR(inode)) { gfs2_holder_uninit(ghs); return PTR_ERR(inode); } ip = ghs[1].gh_gl->gl_object; ip->i_inode.i_nlink = 2; ip->i_disksize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); ip->i_diskflags |= GFS2_DIF_JDATA; ip->i_entries = 2; error = gfs2_meta_inode_buffer(ip, &dibh); if (!gfs2_assert_withdraw(sdp, !error)) { struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); struct qstr str; gfs2_str2qstr(&str, "."); gfs2_trans_add_bh(ip->i_gl, dibh, 1); gfs2_qstr2dirent(&str, GFS2_DIRENT_SIZE(str.len), dent); dent->de_inum = di->di_num; /* already GFS2 endian */ dent->de_type = cpu_to_be16(DT_DIR); di->di_entries = cpu_to_be32(1); gfs2_str2qstr(&str, ".."); dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); gfs2_qstr2dirent(&str, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); gfs2_inum_out(dip, dent); dent->de_type = cpu_to_be16(DT_DIR); gfs2_dinode_out(ip, di); brelse(dibh); } error = gfs2_change_nlink(dip, +1); gfs2_assert_withdraw(sdp, !error); /* dip already pinned */ gfs2_trans_end(sdp); if (dip->i_alloc->al_rgd) gfs2_inplace_release(dip); gfs2_quota_unlock(dip); gfs2_alloc_put(dip); gfs2_glock_dq_uninit_m(2, ghs); d_instantiate(dentry, inode); mark_inode_dirty(inode); return 0; } /** * 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 */ static int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, struct gfs2_inode *ip) { struct qstr dotname; int error; if (ip->i_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_rmdir - Remove a directory * @dir: The parent directory of the directory to be removed * @dentry: The dentry of the directory to remove * * Remove a directory. Call gfs2_rmdiri() * * Returns: errno */ static int gfs2_rmdir(struct inode *dir, struct dentry *dentry) { struct gfs2_inode *dip = GFS2_I(dir); struct gfs2_sbd *sdp = GFS2_SB(dir); struct gfs2_inode *ip = GFS2_I(dentry->d_inode); struct gfs2_holder ghs[3]; struct gfs2_rgrpd *rgd; struct gfs2_holder ri_gh; int error; error = gfs2_rindex_hold(sdp, &ri_gh); if (error) return error; gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr); gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); error = gfs2_glock_nq(ghs); /* parent */ if (error) goto out_parent; error = gfs2_glock_nq(ghs + 1); /* child */ if (error) goto out_child; error = gfs2_glock_nq(ghs + 2); /* rgrp */ if (error) goto out_rgrp; error = gfs2_unlink_ok(dip, &dentry->d_name, ip); if (error) goto out_gunlock; if (ip->i_entries < 2) { if (gfs2_consist_inode(ip)) gfs2_dinode_print(ip); error = -EIO; goto out_gunlock; } if (ip->i_entries > 2) { error = -ENOTEMPTY; goto out_gunlock; } error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0); if (error) goto out_gunlock; error = gfs2_rmdiri(dip, &dentry->d_name, ip); gfs2_trans_end(sdp); out_gunlock: gfs2_glock_dq(ghs + 2); out_rgrp: gfs2_holder_uninit(ghs + 2); gfs2_glock_dq(ghs + 1); out_child: gfs2_holder_uninit(ghs + 1); gfs2_glock_dq(ghs); out_parent: gfs2_holder_uninit(ghs); gfs2_glock_dq_uninit(&ri_gh); return error; } /** * gfs2_mknod - Make a special file * @dir: The directory in which the special file will reside * @dentry: The dentry of the special file * @mode: The mode of the special file * @rdev: The device specification of the special file * */ static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) { struct gfs2_inode *dip = GFS2_I(dir); struct gfs2_sbd *sdp = GFS2_SB(dir); struct gfs2_holder ghs[2]; struct inode *inode; gfs2_holder_init(dip->i_gl, 0, 0, ghs); inode = gfs2_createi(ghs, &dentry->d_name, mode, dev); if (IS_ERR(inode)) { gfs2_holder_uninit(ghs); return PTR_ERR(inode); } gfs2_trans_end(sdp); if (dip->i_alloc->al_rgd) gfs2_inplace_release(dip); gfs2_quota_unlock(dip); gfs2_alloc_put(dip); gfs2_glock_dq_uninit_m(2, ghs); d_instantiate(dentry, inode); mark_inode_dirty(inode); 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 */ static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) { struct inode *dir = &to->i_inode; struct super_block *sb = dir->i_sb; struct inode *tmp; 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); if (IS_ERR(tmp)) { error = PTR_ERR(tmp); break; } iput(dir); dir = tmp; } iput(dir); return error; } /** * gfs2_rename - Rename a file * @odir: Parent directory of old file name * @odentry: The old dentry of the file * @ndir: Parent directory of new file name * @ndentry: The new dentry of the file * * Returns: errno */ static int gfs2_rename(struct inode *odir, struct dentry *odentry, struct inode *ndir, struct dentry *ndentry) { struct gfs2_inode *odip = GFS2_I(odir); struct gfs2_inode *ndip = GFS2_I(ndir); struct gfs2_inode *ip = GFS2_I(odentry->d_inode); struct gfs2_inode *nip = NULL; struct gfs2_sbd *sdp = GFS2_SB(odir); struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; struct gfs2_rgrpd *nrgd; unsigned int num_gh; int dir_rename = 0; int alloc_required; unsigned int x; int error; if (ndentry->d_inode) { nip = GFS2_I(ndentry->d_inode); if (ip == nip) return 0; } if (odip != ndip) { error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 0, &r_gh); if (error) goto out; if (S_ISDIR(ip->i_inode.i_mode)) { dir_rename = 1; /* don't move a dirctory into it's subdir */ error = gfs2_ok_to_move(ip, ndip); if (error) goto out_gunlock_r; } } num_gh = 1; gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); if (odip != ndip) { gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); num_gh++; } gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); num_gh++; if (nip) { gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); num_gh++; /* grab the resource lock for unlink flag twiddling * this is the case of the target file already existing * so we unlink before doing the rename */ nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr); if (nrgd) gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); } for (x = 0; x < num_gh; x++) { error = gfs2_glock_nq(ghs + x); if (error) goto out_gunlock; } /* Check out the old directory */ error = gfs2_unlink_ok(odip, &odentry->d_name, ip); if (error) goto out_gunlock; /* Check out the new directory */ if (nip) { error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); if (error) goto out_gunlock; if (S_ISDIR(nip->i_inode.i_mode)) { if (nip->i_entries < 2) { if (gfs2_consist_inode(nip)) gfs2_dinode_print(nip); error = -EIO; goto out_gunlock; } if (nip->i_entries > 2) { error = -ENOTEMPTY; goto out_gunlock; } } } else { error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); if (error) goto out_gunlock; error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); switch (error) { case -ENOENT: error = 0; break; case 0: error = -EEXIST; default: goto out_gunlock; }; if (odip != ndip) { if (!ndip->i_inode.i_nlink) { error = -EINVAL; goto out_gunlock; } if (ndip->i_entries == (u32)-1) { error = -EFBIG; goto out_gunlock; } if (S_ISDIR(ip->i_inode.i_mode) && ndip->i_inode.i_nlink == (u32)-1) { error = -EMLINK; goto out_gunlock; } } } /* Check out the dir to be renamed */ if (dir_rename) { error = gfs2_permission(odentry->d_inode, MAY_WRITE); if (error) goto out_gunlock; } alloc_required = error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name); if (error < 0) goto out_gunlock; error = 0; if (alloc_required) { struct gfs2_alloc *al = gfs2_alloc_get(ndip); if (!al) { error = -ENOMEM; goto out_gunlock; } error = gfs2_quota_lock_check(ndip); if (error) goto out_alloc; al->al_requested = sdp->sd_max_dirres; error = gfs2_inplace_reserve(ndip); if (error) goto out_gunlock_q; error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + al->al_rgd->rd_length + 4 * RES_DINODE + 4 * RES_LEAF + RES_STATFS + RES_QUOTA + 4, 0); if (error) goto out_ipreserv; } else { error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 5 * RES_LEAF + 4, 0); if (error) goto out_gunlock; } /* Remove the target file, if it exists */ if (nip) { if (S_ISDIR(nip->i_inode.i_mode)) error = gfs2_rmdiri(ndip, &ndentry->d_name, nip); else { error = gfs2_dir_del(ndip, &ndentry->d_name); if (error) goto out_end_trans; error = gfs2_change_nlink(nip, -1); } if (error) goto out_end_trans; } if (dir_rename) { struct qstr name; gfs2_str2qstr(&name, ".."); error = gfs2_change_nlink(ndip, +1); if (error) goto out_end_trans; error = gfs2_change_nlink(odip, -1); if (error) goto out_end_trans; error = gfs2_dir_mvino(ip, &name, ndip, DT_DIR); if (error) goto out_end_trans; } else { struct buffer_head *dibh; error = gfs2_meta_inode_buffer(ip, &dibh); if (error) goto out_end_trans; ip->i_inode.i_ctime = CURRENT_TIME; gfs2_trans_add_bh(ip->i_gl, dibh, 1); gfs2_dinode_out(ip, dibh->b_data); brelse(dibh); } error = gfs2_dir_del(odip, &odentry->d_name); if (error) goto out_end_trans; error = gfs2_dir_add(ndir, &ndentry->d_name, ip, IF2DT(ip->i_inode.i_mode)); if (error) goto out_end_trans; out_end_trans: gfs2_trans_end(sdp); out_ipreserv: if (alloc_required) gfs2_inplace_release(ndip); out_gunlock_q: if (alloc_required) gfs2_quota_unlock(ndip); out_alloc: if (alloc_required) gfs2_alloc_put(ndip); out_gunlock: while (x--) { gfs2_glock_dq(ghs + x); gfs2_holder_uninit(ghs + x); } out_gunlock_r: if (r_gh.gh_gl) gfs2_glock_dq_uninit(&r_gh); out: return error; } /** * gfs2_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 */ static 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, 0, &i_gh); error = gfs2_glock_nq(&i_gh); if (error) { gfs2_holder_uninit(&i_gh); return error; } if (!ip->i_disksize) { gfs2_consist_inode(ip); error = -EIO; goto out; } error = gfs2_meta_inode_buffer(ip, &dibh); if (error) goto out; x = ip->i_disksize + 1; if (x > *len) { *buf = kmalloc(x, GFP_NOFS); 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_readlink - Read the value of a symlink * @dentry: the symlink * @buf: the buffer to read the symlink data into * @size: the size of the buffer * * Returns: errno */ static int gfs2_readlink(struct dentry *dentry, char __user *user_buf, int user_size) { struct gfs2_inode *ip = GFS2_I(dentry->d_inode); char array[GFS2_FAST_NAME_SIZE], *buf = array; unsigned int len = GFS2_FAST_NAME_SIZE; int error; error = gfs2_readlinki(ip, &buf, &len); if (error) return error; if (user_size > len - 1) user_size = len - 1; if (copy_to_user(user_buf, buf, user_size)) error = -EFAULT; else error = user_size; if (buf != array) kfree(buf); return error; } /** * gfs2_follow_link - Follow a symbolic link * @dentry: The dentry of the link * @nd: Data that we pass to vfs_follow_link() * * This can handle symlinks of any size. It is optimised for symlinks * under GFS2_FAST_NAME_SIZE. * * Returns: 0 on success or error code */ static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) { struct gfs2_inode *ip = GFS2_I(dentry->d_inode); char array[GFS2_FAST_NAME_SIZE], *buf = array; unsigned int len = GFS2_FAST_NAME_SIZE; int error; error = gfs2_readlinki(ip, &buf, &len); if (!error) { error = vfs_follow_link(nd, buf); if (buf != array) kfree(buf); } return ERR_PTR(error); } /** * gfs2_permission - * @inode: * @mask: * @nd: passed from Linux VFS, ignored by us * * This may be called from the VFS directly, or from within GFS2 with the * inode locked, so we look to see if the glock is already locked and only * lock the glock if its not already been done. * * Returns: errno */ int gfs2_permission(struct inode *inode, int mask) { struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_holder i_gh; int error; int unlock = 0; if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); if (error) return error; unlock = 1; } if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) error = -EACCES; else error = generic_permission(inode, mask, gfs2_check_acl); if (unlock) gfs2_glock_dq_uninit(&i_gh); return error; } static int setattr_size(struct inode *inode, struct iattr *attr) { struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_sbd *sdp = GFS2_SB(inode); int error; if (attr->ia_size != ip->i_disksize) { error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks); if (error) return error; error = vmtruncate(inode, attr->ia_size); gfs2_trans_end(sdp); if (error) return error; } error = gfs2_truncatei(ip, attr->ia_size); if (error && (inode->i_size != ip->i_disksize)) i_size_write(inode, ip->i_disksize); return error; } static int setattr_chown(struct inode *inode, struct iattr *attr) { struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_sbd *sdp = GFS2_SB(inode); struct buffer_head *dibh; u32 ouid, ogid, nuid, ngid; int error; ouid = inode->i_uid; ogid = inode->i_gid; nuid = attr->ia_uid; ngid = attr->ia_gid; if (!(attr->ia_valid & ATTR_UID) || ouid == nuid) ouid = nuid = NO_QUOTA_CHANGE; if (!(attr->ia_valid & ATTR_GID) || ogid == ngid) ogid = ngid = NO_QUOTA_CHANGE; if (!gfs2_alloc_get(ip)) return -ENOMEM; error = gfs2_quota_lock(ip, nuid, ngid); if (error) goto out_alloc; if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { error = gfs2_quota_check(ip, nuid, ngid); if (error) goto out_gunlock_q; } error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); if (error) goto out_gunlock_q; error = gfs2_meta_inode_buffer(ip, &dibh); if (error) goto out_end_trans; error = inode_setattr(inode, attr); gfs2_assert_warn(sdp, !error); gfs2_trans_add_bh(ip->i_gl, dibh, 1); gfs2_dinode_out(ip, dibh->b_data); brelse(dibh); if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); gfs2_quota_change(ip, -blocks, ouid, ogid); gfs2_quota_change(ip, blocks, nuid, ngid); } out_end_trans: gfs2_trans_end(sdp); out_gunlock_q: gfs2_quota_unlock(ip); out_alloc: gfs2_alloc_put(ip); return error; } /** * gfs2_setattr - Change attributes on an inode * @dentry: The dentry which is changing * @attr: The structure describing the change * * The VFS layer wants to change one or more of an inodes attributes. Write * that change out to disk. * * Returns: errno */ static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) { struct inode *inode = dentry->d_inode; struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_holder i_gh; int error; error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); if (error) return error; error = -EPERM; if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) goto out; error = inode_change_ok(inode, attr); if (error) goto out; if (attr->ia_valid & ATTR_SIZE) error = setattr_size(inode, attr); else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) error = setattr_chown(inode, attr); else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) error = gfs2_acl_chmod(ip, attr); else error = gfs2_setattr_simple(ip, attr); out: gfs2_glock_dq_uninit(&i_gh); if (!error) mark_inode_dirty(inode); return error; } /** * gfs2_getattr - Read out an inode's attributes * @mnt: The vfsmount the inode is being accessed from * @dentry: The dentry to stat * @stat: The inode's stats * * This may be called from the VFS directly, or from within GFS2 with the * inode locked, so we look to see if the glock is already locked and only * lock the glock if its not already been done. Note that its the NFS * readdirplus operation which causes this to be called (from filldir) * with the glock already held. * * Returns: errno */ static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) { struct inode *inode = dentry->d_inode; struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_holder gh; int error; int unlock = 0; if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); if (error) return error; unlock = 1; } generic_fillattr(inode, stat); if (unlock) gfs2_glock_dq_uninit(&gh); return 0; } static int gfs2_setxattr(struct dentry *dentry, const char *name, const void *data, size_t size, int flags) { struct inode *inode = dentry->d_inode; struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_holder gh; int ret; gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); ret = gfs2_glock_nq(&gh); if (ret == 0) { ret = generic_setxattr(dentry, name, data, size, flags); gfs2_glock_dq(&gh); } gfs2_holder_uninit(&gh); return ret; } static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, void *data, size_t size) { struct inode *inode = dentry->d_inode; struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_holder gh; int ret; gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); ret = gfs2_glock_nq(&gh); if (ret == 0) { ret = generic_getxattr(dentry, name, data, size); gfs2_glock_dq(&gh); } gfs2_holder_uninit(&gh); return ret; } static int gfs2_removexattr(struct dentry *dentry, const char *name) { struct inode *inode = dentry->d_inode; struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_holder gh; int ret; gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); ret = gfs2_glock_nq(&gh); if (ret == 0) { ret = generic_removexattr(dentry, name); gfs2_glock_dq(&gh); } gfs2_holder_uninit(&gh); return ret; } static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, u64 start, u64 len) { struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_holder gh; int ret; ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); if (ret) return ret; mutex_lock(&inode->i_mutex); ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); if (ret) goto out; if (gfs2_is_stuffed(ip)) { u64 phys = ip->i_no_addr << inode->i_blkbits; u64 size = i_size_read(inode); u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| FIEMAP_EXTENT_DATA_INLINE; phys += sizeof(struct gfs2_dinode); phys += start; if (start + len > size) len = size - start; if (start < size) ret = fiemap_fill_next_extent(fieinfo, start, phys, len, flags); if (ret == 1) ret = 0; } else { ret = __generic_block_fiemap(inode, fieinfo, start, len, gfs2_block_map); } gfs2_glock_dq_uninit(&gh); out: mutex_unlock(&inode->i_mutex); return ret; } const struct inode_operations gfs2_file_iops = { .permission = gfs2_permission, .setattr = gfs2_setattr, .getattr = gfs2_getattr, .setxattr = gfs2_setxattr, .getxattr = gfs2_getxattr, .listxattr = gfs2_listxattr, .removexattr = gfs2_removexattr, .fiemap = gfs2_fiemap, }; const struct inode_operations gfs2_dir_iops = { .create = gfs2_create, .lookup = gfs2_lookup, .link = gfs2_link, .unlink = gfs2_unlink, .symlink = gfs2_symlink, .mkdir = gfs2_mkdir, .rmdir = gfs2_rmdir, .mknod = gfs2_mknod, .rename = gfs2_rename, .permission = gfs2_permission, .setattr = gfs2_setattr, .getattr = gfs2_getattr, .setxattr = gfs2_setxattr, .getxattr = gfs2_getxattr, .listxattr = gfs2_listxattr, .removexattr = gfs2_removexattr, .fiemap = gfs2_fiemap, }; const struct inode_operations gfs2_symlink_iops = { .readlink = gfs2_readlink, .follow_link = gfs2_follow_link, .permission = gfs2_permission, .setattr = gfs2_setattr, .getattr = gfs2_getattr, .setxattr = gfs2_setxattr, .getxattr = gfs2_getxattr, .listxattr = gfs2_listxattr, .removexattr = gfs2_removexattr, .fiemap = gfs2_fiemap, };