diff options
Diffstat (limited to 'fs/gfs2/inode.c')
| -rw-r--r-- | fs/gfs2/inode.c | 2198 |
1 files changed, 2198 insertions, 0 deletions
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c new file mode 100644 index 000000000..23e6962cd --- /dev/null +++ b/fs/gfs2/inode.c @@ -0,0 +1,2198 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. + * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved. + */ + +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/completion.h> +#include <linux/buffer_head.h> +#include <linux/namei.h> +#include <linux/mm.h> +#include <linux/cred.h> +#include <linux/xattr.h> +#include <linux/posix_acl.h> +#include <linux/gfs2_ondisk.h> +#include <linux/crc32.h> +#include <linux/iomap.h> +#include <linux/security.h> +#include <linux/fiemap.h> +#include <linux/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" +#include "glops.h" + +static const struct inode_operations gfs2_file_iops; +static const struct inode_operations gfs2_dir_iops; +static const struct inode_operations gfs2_symlink_iops; + +/** + * gfs2_set_iop - Sets inode operations + * @inode: The inode with correct i_mode filled in + * + * GFS2 lookup code fills in vfs inode contents based on info obtained + * from directory entry inside gfs2_inode_lookup(). + */ + +static void gfs2_set_iop(struct inode *inode) +{ + struct gfs2_sbd *sdp = GFS2_SB(inode); + umode_t mode = inode->i_mode; + + if (S_ISREG(mode)) { + inode->i_op = &gfs2_file_iops; + if (gfs2_localflocks(sdp)) + inode->i_fop = &gfs2_file_fops_nolock; + else + inode->i_fop = &gfs2_file_fops; + } else if (S_ISDIR(mode)) { + inode->i_op = &gfs2_dir_iops; + if (gfs2_localflocks(sdp)) + inode->i_fop = &gfs2_dir_fops_nolock; + else + inode->i_fop = &gfs2_dir_fops; + } else if (S_ISLNK(mode)) { + inode->i_op = &gfs2_symlink_iops; + } else { + inode->i_op = &gfs2_file_iops; + init_special_inode(inode, inode->i_mode, inode->i_rdev); + } +} + +static int iget_test(struct inode *inode, void *opaque) +{ + u64 no_addr = *(u64 *)opaque; + + return GFS2_I(inode)->i_no_addr == no_addr; +} + +static int iget_set(struct inode *inode, void *opaque) +{ + u64 no_addr = *(u64 *)opaque; + + GFS2_I(inode)->i_no_addr = no_addr; + inode->i_ino = no_addr; + return 0; +} + +/** + * gfs2_inode_lookup - Lookup an inode + * @sb: The super block + * @type: The type of the inode + * @no_addr: The inode number + * @no_formal_ino: The inode generation number + * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED; + * GFS2_BLKST_FREE to indicate not to verify) + * + * If @type is DT_UNKNOWN, the inode type is fetched from disk. + * + * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a + * placeholder because it doesn't otherwise make sense), the on-disk block type + * is verified to be @blktype. + * + * When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE) + * if it detects that @no_formal_ino doesn't match the actual inode generation + * number. However, it doesn't always know unless @type is DT_UNKNOWN. + * + * Returns: A VFS inode, or an error + */ + +struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type, + u64 no_addr, u64 no_formal_ino, + unsigned int blktype) +{ + struct inode *inode; + struct gfs2_inode *ip; + struct gfs2_holder i_gh; + int error; + + gfs2_holder_mark_uninitialized(&i_gh); + inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr); + if (!inode) + return ERR_PTR(-ENOMEM); + + ip = GFS2_I(inode); + + if (inode->i_state & I_NEW) { + struct gfs2_sbd *sdp = GFS2_SB(inode); + struct gfs2_glock *io_gl; + int extra_flags = 0; + + error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, + &ip->i_gl); + if (unlikely(error)) + goto fail; + + error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, + &io_gl); + if (unlikely(error)) + goto fail; + + if (blktype == GFS2_BLKST_UNLINKED) + extra_flags |= LM_FLAG_TRY; + else + gfs2_cancel_delete_work(io_gl); + error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, + GL_EXACT | GL_NOPID | extra_flags, + &ip->i_iopen_gh); + gfs2_glock_put(io_gl); + if (unlikely(error)) + goto fail; + + if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) { + /* + * The GL_SKIP flag indicates to skip reading the inode + * block. We read the inode when instantiating it + * after possibly checking the block type. + */ + error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, + GL_SKIP, &i_gh); + if (error) + goto fail; + + error = -ESTALE; + if (no_formal_ino && + gfs2_inode_already_deleted(ip->i_gl, no_formal_ino)) + goto fail; + + if (blktype != GFS2_BLKST_FREE) { + error = gfs2_check_blk_type(sdp, no_addr, + blktype); + if (error) + goto fail; + } + } + + set_bit(GLF_INSTANTIATE_NEEDED, &ip->i_gl->gl_flags); + + /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */ + inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1); + inode->i_atime.tv_nsec = 0; + + glock_set_object(ip->i_gl, ip); + + if (type == DT_UNKNOWN) { + /* Inode glock must be locked already */ + error = gfs2_instantiate(&i_gh); + if (error) { + glock_clear_object(ip->i_gl, ip); + goto fail; + } + } else { + ip->i_no_formal_ino = no_formal_ino; + inode->i_mode = DT2IF(type); + } + + if (gfs2_holder_initialized(&i_gh)) + gfs2_glock_dq_uninit(&i_gh); + glock_set_object(ip->i_iopen_gh.gh_gl, ip); + + gfs2_set_iop(inode); + unlock_new_inode(inode); + } + + if (no_formal_ino && ip->i_no_formal_ino && + no_formal_ino != ip->i_no_formal_ino) { + iput(inode); + return ERR_PTR(-ESTALE); + } + + return inode; + +fail: + if (error == GLR_TRYFAILED) + error = -EAGAIN; + if (gfs2_holder_initialized(&ip->i_iopen_gh)) + gfs2_glock_dq_uninit(&ip->i_iopen_gh); + if (gfs2_holder_initialized(&i_gh)) + gfs2_glock_dq_uninit(&i_gh); + iget_failed(inode); + return ERR_PTR(error); +} + +/** + * gfs2_lookup_by_inum - look up an inode by inode number + * @sdp: The super block + * @no_addr: The inode number + * @no_formal_ino: The inode generation number (0 for any) + * @blktype: Requested block type (see gfs2_inode_lookup) + */ +struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, + u64 no_formal_ino, unsigned int blktype) +{ + struct super_block *sb = sdp->sd_vfs; + struct inode *inode; + int error; + + inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino, + blktype); + if (IS_ERR(inode)) + return inode; + + if (no_formal_ino) { + error = -EIO; + if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) + goto fail_iput; + } + return inode; + +fail_iput: + iput(inode); + return ERR_PTR(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); + /* 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 + * @dir: The inode of the directory containing the inode to look-up + * @name: The name of the inode to look for + * @is_root: If 1, ignore the caller's permissions + * + * 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 super_block *sb = dir->i_sb; + struct gfs2_inode *dip = GFS2_I(dir); + struct gfs2_holder d_gh; + int error = 0; + struct inode *inode = NULL; + + gfs2_holder_mark_uninitialized(&d_gh); + 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 == d_inode(sb->s_root))) { + igrab(dir); + return dir; + } + + if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { + error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); + if (error) + return ERR_PTR(error); + } + + if (!is_root) { + error = gfs2_permission(&init_user_ns, dir, MAY_EXEC); + if (error) + goto out; + } + + inode = gfs2_dir_search(dir, name, false); + if (IS_ERR(inode)) + error = PTR_ERR(inode); +out: + if (gfs2_holder_initialized(&d_gh)) + gfs2_glock_dq_uninit(&d_gh); + if (error == -ENOENT) + return NULL; + return inode ? inode : ERR_PTR(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, + umode_t mode) +{ + int error; + + error = gfs2_permission(&init_user_ns, &dip->i_inode, + MAY_WRITE | MAY_EXEC); + if (error) + return error; + + /* Don't create entries in an unlinked directory */ + if (!dip->i_inode.i_nlink) + return -ENOENT; + + if (dip->i_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(const struct gfs2_inode *dip, + struct inode *inode) +{ + if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && + (dip->i_inode.i_mode & S_ISUID) && + !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { + if (S_ISDIR(inode->i_mode)) + inode->i_mode |= S_ISUID; + else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) + inode->i_mode &= ~07111; + inode->i_uid = dip->i_inode.i_uid; + } else + inode->i_uid = current_fsuid(); + + if (dip->i_inode.i_mode & S_ISGID) { + if (S_ISDIR(inode->i_mode)) + inode->i_mode |= S_ISGID; + inode->i_gid = dip->i_inode.i_gid; + } else + inode->i_gid = current_fsgid(); +} + +static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks) +{ + struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); + struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, }; + int error; + + error = gfs2_quota_lock_check(ip, &ap); + if (error) + goto out; + + error = gfs2_inplace_reserve(ip, &ap); + if (error) + goto out_quota; + + error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0); + if (error) + goto out_ipreserv; + + error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation); + ip->i_no_formal_ino = ip->i_generation; + ip->i_inode.i_ino = ip->i_no_addr; + ip->i_goal = ip->i_no_addr; + + gfs2_trans_end(sdp); + +out_ipreserv: + gfs2_inplace_release(ip); +out_quota: + gfs2_quota_unlock(ip); +out: + return error; +} + +static void gfs2_init_dir(struct buffer_head *dibh, + const struct gfs2_inode *parent) +{ + struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; + struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); + + gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); + dent->de_inum = di->di_num; /* already GFS2 endian */ + dent->de_type = cpu_to_be16(DT_DIR); + + dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); + gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); + gfs2_inum_out(parent, dent); + dent->de_type = cpu_to_be16(DT_DIR); + +} + +/** + * gfs2_init_xattr - Initialise an xattr block for a new inode + * @ip: The inode in question + * + * This sets up an empty xattr block for a new inode, ready to + * take any ACLs, LSM xattrs, etc. + */ + +static void gfs2_init_xattr(struct gfs2_inode *ip) +{ + struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); + struct buffer_head *bh; + struct gfs2_ea_header *ea; + + bh = gfs2_meta_new(ip->i_gl, ip->i_eattr); + gfs2_trans_add_meta(ip->i_gl, bh); + gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA); + gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); + + ea = GFS2_EA_BH2FIRST(bh); + ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize); + ea->ea_type = GFS2_EATYPE_UNUSED; + ea->ea_flags = GFS2_EAFLAG_LAST; + + brelse(bh); +} + +/** + * init_dinode - Fill in a new dinode structure + * @dip: The directory this inode is being created in + * @ip: The inode + * @symname: The symlink destination (if a symlink) + * + */ + +static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, + const char *symname) +{ + struct gfs2_dinode *di; + struct buffer_head *dibh; + + dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); + gfs2_trans_add_meta(ip->i_gl, dibh); + di = (struct gfs2_dinode *)dibh->b_data; + gfs2_dinode_out(ip, di); + + di->di_major = cpu_to_be32(imajor(&ip->i_inode)); + di->di_minor = cpu_to_be32(iminor(&ip->i_inode)); + di->__pad1 = 0; + di->__pad2 = 0; + di->__pad3 = 0; + memset(&di->__pad4, 0, sizeof(di->__pad4)); + memset(&di->di_reserved, 0, sizeof(di->di_reserved)); + gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); + + switch(ip->i_inode.i_mode & S_IFMT) { + case S_IFDIR: + gfs2_init_dir(dibh, dip); + break; + case S_IFLNK: + memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); + break; + } + + set_buffer_uptodate(dibh); + brelse(dibh); +} + +/** + * gfs2_trans_da_blks - Calculate number of blocks to link inode + * @dip: The directory we are linking into + * @da: The dir add information + * @nr_inodes: The number of inodes involved + * + * This calculate the number of blocks we need to reserve in a + * transaction to link @nr_inodes into a directory. In most cases + * @nr_inodes will be 2 (the directory plus the inode being linked in) + * but in case of rename, 4 may be required. + * + * Returns: Number of blocks + */ + +static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip, + const struct gfs2_diradd *da, + unsigned nr_inodes) +{ + return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) + + (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS; +} + +static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, + struct gfs2_inode *ip, struct gfs2_diradd *da) +{ + struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); + struct gfs2_alloc_parms ap = { .target = da->nr_blocks, }; + int error; + + if (da->nr_blocks) { + error = gfs2_quota_lock_check(dip, &ap); + if (error) + goto fail_quota_locks; + + error = gfs2_inplace_reserve(dip, &ap); + if (error) + goto fail_quota_locks; + + error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 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, da); + + gfs2_trans_end(sdp); +fail_ipreserv: + gfs2_inplace_release(dip); +fail_quota_locks: + gfs2_quota_unlock(dip); + return error; +} + +static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, + void *fs_info) +{ + const struct xattr *xattr; + int err = 0; + + for (xattr = xattr_array; xattr->name != NULL; xattr++) { + err = __gfs2_xattr_set(inode, xattr->name, xattr->value, + xattr->value_len, 0, + GFS2_EATYPE_SECURITY); + if (err < 0) + break; + } + return err; +} + +/** + * gfs2_create_inode - Create a new inode + * @dir: The parent directory + * @dentry: The new dentry + * @file: If non-NULL, the file which is being opened + * @mode: The permissions on the new inode + * @dev: For device nodes, this is the device number + * @symname: For symlinks, this is the link destination + * @size: The initial size of the inode (ignored for directories) + * @excl: Force fail if inode exists + * + * Returns: 0 on success, or error code + */ + +static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, + struct file *file, + umode_t mode, dev_t dev, const char *symname, + unsigned int size, int excl) +{ + const struct qstr *name = &dentry->d_name; + struct posix_acl *default_acl, *acl; + struct gfs2_holder ghs[2]; + struct inode *inode = NULL; + struct gfs2_inode *dip = GFS2_I(dir), *ip; + struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); + struct gfs2_glock *io_gl; + int error, free_vfs_inode = 1; + u32 aflags = 0; + unsigned blocks = 1; + struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; + + if (!name->len || name->len > GFS2_FNAMESIZE) + return -ENAMETOOLONG; + + error = gfs2_qa_get(dip); + if (error) + return error; + + error = gfs2_rindex_update(sdp); + if (error) + goto fail; + + error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); + if (error) + goto fail; + gfs2_holder_mark_uninitialized(ghs + 1); + + error = create_ok(dip, name, mode); + if (error) + goto fail_gunlock; + + inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); + error = PTR_ERR(inode); + if (!IS_ERR(inode)) { + if (S_ISDIR(inode->i_mode)) { + iput(inode); + inode = ERR_PTR(-EISDIR); + goto fail_gunlock; + } + d_instantiate(dentry, inode); + error = 0; + if (file) { + if (S_ISREG(inode->i_mode)) + error = finish_open(file, dentry, gfs2_open_common); + else + error = finish_no_open(file, NULL); + } + gfs2_glock_dq_uninit(ghs); + goto fail; + } else if (error != -ENOENT) { + goto fail_gunlock; + } + + error = gfs2_diradd_alloc_required(dir, name, &da); + if (error < 0) + goto fail_gunlock; + + inode = new_inode(sdp->sd_vfs); + error = -ENOMEM; + if (!inode) + goto fail_gunlock; + + error = posix_acl_create(dir, &mode, &default_acl, &acl); + if (error) + goto fail_gunlock; + + ip = GFS2_I(inode); + error = gfs2_qa_get(ip); + if (error) + goto fail_free_acls; + + inode->i_mode = mode; + set_nlink(inode, S_ISDIR(mode) ? 2 : 1); + inode->i_rdev = dev; + inode->i_size = size; + inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); + munge_mode_uid_gid(dip, inode); + check_and_update_goal(dip); + ip->i_goal = dip->i_goal; + ip->i_diskflags = 0; + ip->i_eattr = 0; + ip->i_height = 0; + ip->i_depth = 0; + ip->i_entries = 0; + ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */ + + switch(mode & S_IFMT) { + case S_IFREG: + if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || + gfs2_tune_get(sdp, gt_new_files_jdata)) + ip->i_diskflags |= GFS2_DIF_JDATA; + gfs2_set_aops(inode); + break; + case S_IFDIR: + ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); + ip->i_diskflags |= GFS2_DIF_JDATA; + ip->i_entries = 2; + break; + } + + /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */ + if (dip->i_diskflags & GFS2_DIF_SYSTEM) + ip->i_diskflags |= GFS2_DIF_SYSTEM; + + gfs2_set_inode_flags(inode); + + if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) || + (dip->i_diskflags & GFS2_DIF_TOPDIR)) + aflags |= GFS2_AF_ORLOV; + + if (default_acl || acl) + blocks++; + + error = alloc_dinode(ip, aflags, &blocks); + if (error) + goto fail_free_inode; + + gfs2_set_inode_blocks(inode, blocks); + + error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); + if (error) + goto fail_free_inode; + + error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); + if (error) + goto fail_free_inode; + gfs2_cancel_delete_work(io_gl); + + error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr); + BUG_ON(error); + + error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT | GL_NOPID, + &ip->i_iopen_gh); + if (error) + goto fail_gunlock2; + + error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); + if (error) + goto fail_gunlock3; + + error = gfs2_trans_begin(sdp, blocks, 0); + if (error) + goto fail_gunlock3; + + if (blocks > 1) { + ip->i_eattr = ip->i_no_addr + 1; + gfs2_init_xattr(ip); + } + init_dinode(dip, ip, symname); + gfs2_trans_end(sdp); + + glock_set_object(ip->i_gl, ip); + glock_set_object(io_gl, ip); + gfs2_set_iop(inode); + + free_vfs_inode = 0; /* After this point, the inode is no longer + considered free. Any failures need to undo + the gfs2 structures. */ + if (default_acl) { + error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); + if (error) + goto fail_gunlock4; + posix_acl_release(default_acl); + default_acl = NULL; + } + if (acl) { + error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); + if (error) + goto fail_gunlock4; + posix_acl_release(acl); + acl = NULL; + } + + error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name, + &gfs2_initxattrs, NULL); + if (error) + goto fail_gunlock4; + + error = link_dinode(dip, name, ip, &da); + if (error) + goto fail_gunlock4; + + mark_inode_dirty(inode); + d_instantiate(dentry, inode); + /* After instantiate, errors should result in evict which will destroy + * both inode and iopen glocks properly. */ + if (file) { + file->f_mode |= FMODE_CREATED; + error = finish_open(file, dentry, gfs2_open_common); + } + gfs2_glock_dq_uninit(ghs); + gfs2_qa_put(ip); + gfs2_glock_dq_uninit(ghs + 1); + gfs2_glock_put(io_gl); + gfs2_qa_put(dip); + unlock_new_inode(inode); + return error; + +fail_gunlock4: + glock_clear_object(ip->i_gl, ip); + glock_clear_object(io_gl, ip); +fail_gunlock3: + gfs2_glock_dq_uninit(&ip->i_iopen_gh); +fail_gunlock2: + gfs2_glock_put(io_gl); +fail_free_inode: + if (ip->i_gl) { + if (free_vfs_inode) /* else evict will do the put for us */ + gfs2_glock_put(ip->i_gl); + } + gfs2_rs_deltree(&ip->i_res); + gfs2_qa_put(ip); +fail_free_acls: + posix_acl_release(default_acl); + posix_acl_release(acl); +fail_gunlock: + gfs2_dir_no_add(&da); + gfs2_glock_dq_uninit(ghs); + if (!IS_ERR_OR_NULL(inode)) { + clear_nlink(inode); + if (!free_vfs_inode) + mark_inode_dirty(inode); + set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED, + &GFS2_I(inode)->i_flags); + if (inode->i_state & I_NEW) + iget_failed(inode); + else + iput(inode); + } + if (gfs2_holder_initialized(ghs + 1)) + gfs2_glock_dq_uninit(ghs + 1); +fail: + gfs2_qa_put(dip); + return error; +} + +/** + * gfs2_create - Create a file + * @mnt_userns: User namespace of the mount the inode was found from + * @dir: The directory in which to create the file + * @dentry: The dentry of the new file + * @mode: The mode of the new file + * @excl: Force fail if inode exists + * + * Returns: errno + */ + +static int gfs2_create(struct user_namespace *mnt_userns, struct inode *dir, + struct dentry *dentry, umode_t mode, bool excl) +{ + return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl); +} + +/** + * __gfs2_lookup - Look up a filename in a directory and return its inode + * @dir: The directory inode + * @dentry: The dentry of the new inode + * @file: File to be opened + * + * + * Returns: errno + */ + +static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, + struct file *file) +{ + struct inode *inode; + struct dentry *d; + struct gfs2_holder gh; + struct gfs2_glock *gl; + int error; + + inode = gfs2_lookupi(dir, &dentry->d_name, 0); + if (inode == NULL) { + d_add(dentry, NULL); + return NULL; + } + if (IS_ERR(inode)) + return ERR_CAST(inode); + + gl = GFS2_I(inode)->i_gl; + error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); + if (error) { + iput(inode); + return ERR_PTR(error); + } + + d = d_splice_alias(inode, dentry); + if (IS_ERR(d)) { + gfs2_glock_dq_uninit(&gh); + return d; + } + if (file && S_ISREG(inode->i_mode)) + error = finish_open(file, dentry, gfs2_open_common); + + gfs2_glock_dq_uninit(&gh); + if (error) { + dput(d); + return ERR_PTR(error); + } + return d; +} + +static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, + unsigned flags) +{ + return __gfs2_lookup(dir, dentry, 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 = d_inode(old_dentry); + struct gfs2_inode *ip = GFS2_I(inode); + struct gfs2_holder ghs[2]; + struct buffer_head *dibh; + struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; + int error; + + if (S_ISDIR(inode->i_mode)) + return -EPERM; + + error = gfs2_qa_get(dip); + 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); + + error = gfs2_glock_nq(ghs); /* parent */ + if (error) + goto out_parent; + + error = gfs2_glock_nq(ghs + 1); /* child */ + if (error) + goto out_child; + + error = -ENOENT; + if (inode->i_nlink == 0) + goto out_gunlock; + + error = gfs2_permission(&init_user_ns, 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; + goto out_gunlock; + 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; + + error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); + if (error < 0) + goto out_gunlock; + + if (da.nr_blocks) { + struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; + error = gfs2_quota_lock_check(dip, &ap); + if (error) + goto out_gunlock; + + error = gfs2_inplace_reserve(dip, &ap); + if (error) + goto out_gunlock_q; + + error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 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_meta_inode_buffer(ip, &dibh); + if (error) + goto out_end_trans; + + error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); + if (error) + goto out_brelse; + + gfs2_trans_add_meta(ip->i_gl, dibh); + inc_nlink(&ip->i_inode); + ip->i_inode.i_ctime = current_time(&ip->i_inode); + ihold(inode); + d_instantiate(dentry, inode); + mark_inode_dirty(inode); + +out_brelse: + brelse(dibh); +out_end_trans: + gfs2_trans_end(sdp); +out_ipres: + if (da.nr_blocks) + gfs2_inplace_release(dip); +out_gunlock_q: + if (da.nr_blocks) + gfs2_quota_unlock(dip); +out_gunlock: + gfs2_dir_no_add(&da); + gfs2_glock_dq(ghs + 1); +out_child: + gfs2_glock_dq(ghs); +out_parent: + gfs2_qa_put(dip); + gfs2_holder_uninit(ghs); + gfs2_holder_uninit(ghs + 1); + 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) && + !uid_eq(dip->i_inode.i_uid, current_fsuid()) && + !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) + return -EPERM; + + if (IS_APPEND(&dip->i_inode)) + return -EPERM; + + error = gfs2_permission(&init_user_ns, &dip->i_inode, + MAY_WRITE | MAY_EXEC); + if (error) + return error; + + return gfs2_dir_check(&dip->i_inode, name, ip); +} + +/** + * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it + * @dip: The parent directory + * @dentry: The dentry to unlink + * + * Called with all the locks and in a transaction. This will only be + * called for a directory after it has been checked to ensure it is empty. + * + * Returns: 0 on success, or an error + */ + +static int gfs2_unlink_inode(struct gfs2_inode *dip, + const struct dentry *dentry) +{ + struct inode *inode = d_inode(dentry); + struct gfs2_inode *ip = GFS2_I(inode); + int error; + + error = gfs2_dir_del(dip, dentry); + if (error) + return error; + + ip->i_entries = 0; + inode->i_ctime = current_time(inode); + if (S_ISDIR(inode->i_mode)) + clear_nlink(inode); + else + drop_nlink(inode); + mark_inode_dirty(inode); + if (inode->i_nlink == 0) + gfs2_unlink_di(inode); + return 0; +} + + +/** + * gfs2_unlink - Unlink an inode (this does rmdir as well) + * @dir: The inode of the directory containing the inode to unlink + * @dentry: The file itself + * + * This routine uses the type of the inode as a flag to figure out + * whether this is an unlink or an rmdir. + * + * 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 inode *inode = d_inode(dentry); + struct gfs2_inode *ip = GFS2_I(inode); + struct gfs2_holder ghs[3]; + struct gfs2_rgrpd *rgd; + int error; + + error = gfs2_rindex_update(sdp); + if (error) + return error; + + error = -EROFS; + + 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, 1); + if (!rgd) + goto out_inodes; + + gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, 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 = -ENOENT; + if (inode->i_nlink == 0) + goto out_rgrp; + + if (S_ISDIR(inode->i_mode)) { + error = -ENOTEMPTY; + if (ip->i_entries > 2 || inode->i_nlink > 2) + goto out_rgrp; + } + + 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 + 3*RES_LEAF + RES_RG_BIT, 0); + if (error) + goto out_gunlock; + + error = gfs2_unlink_inode(dip, dentry); + gfs2_trans_end(sdp); + +out_gunlock: + gfs2_glock_dq(ghs + 2); +out_rgrp: + gfs2_glock_dq(ghs + 1); +out_child: + gfs2_glock_dq(ghs); +out_parent: + gfs2_holder_uninit(ghs + 2); +out_inodes: + gfs2_holder_uninit(ghs + 1); + gfs2_holder_uninit(ghs); + return error; +} + +/** + * gfs2_symlink - Create a symlink + * @mnt_userns: User namespace of the mount the inode was found from + * @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 user_namespace *mnt_userns, struct inode *dir, + struct dentry *dentry, const char *symname) +{ + unsigned int size; + + size = strlen(symname); + if (size >= gfs2_max_stuffed_size(GFS2_I(dir))) + return -ENAMETOOLONG; + + return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); +} + +/** + * gfs2_mkdir - Make a directory + * @mnt_userns: User namespace of the mount the inode was found from + * @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 user_namespace *mnt_userns, struct inode *dir, + struct dentry *dentry, umode_t mode) +{ + unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir)); + return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0); +} + +/** + * gfs2_mknod - Make a special file + * @mnt_userns: User namespace of the mount the inode was found from + * @dir: The directory in which the special file will reside + * @dentry: The dentry of the special file + * @mode: The mode of the special file + * @dev: The device specification of the special file + * + */ + +static int gfs2_mknod(struct user_namespace *mnt_userns, struct inode *dir, + struct dentry *dentry, umode_t mode, dev_t dev) +{ + return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0); +} + +/** + * gfs2_atomic_open - Atomically open a file + * @dir: The directory + * @dentry: The proposed new entry + * @file: The proposed new struct file + * @flags: open flags + * @mode: File mode + * + * Returns: error code or 0 for success + */ + +static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, + struct file *file, unsigned flags, + umode_t mode) +{ + struct dentry *d; + bool excl = !!(flags & O_EXCL); + + if (!d_in_lookup(dentry)) + goto skip_lookup; + + d = __gfs2_lookup(dir, dentry, file); + if (IS_ERR(d)) + return PTR_ERR(d); + if (d != NULL) + dentry = d; + if (d_really_is_positive(dentry)) { + if (!(file->f_mode & FMODE_OPENED)) + return finish_no_open(file, d); + dput(d); + return excl && (flags & O_CREAT) ? -EEXIST : 0; + } + + BUG_ON(d != NULL); + +skip_lookup: + if (!(flags & O_CREAT)) + return -ENOENT; + + return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl); +} + +/* + * 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; + int error = 0; + + igrab(dir); + + for (;;) { + if (dir == &this->i_inode) { + error = -EINVAL; + break; + } + if (dir == d_inode(sb->s_root)) { + error = 0; + break; + } + + tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); + if (!tmp) { + error = -ENOENT; + break; + } + if (IS_ERR(tmp)) { + error = PTR_ERR(tmp); + break; + } + + iput(dir); + dir = tmp; + } + + iput(dir); + + return error; +} + +/** + * update_moved_ino - Update an inode that's being moved + * @ip: The inode being moved + * @ndip: The parent directory of the new filename + * @dir_rename: True of ip is a directory + * + * Returns: errno + */ + +static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip, + int dir_rename) +{ + if (dir_rename) + return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); + + ip->i_inode.i_ctime = current_time(&ip->i_inode); + mark_inode_dirty_sync(&ip->i_inode); + return 0; +} + + +/** + * 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(d_inode(odentry)); + struct gfs2_inode *nip = NULL; + struct gfs2_sbd *sdp = GFS2_SB(odir); + struct gfs2_holder ghs[4], r_gh, rd_gh; + struct gfs2_rgrpd *nrgd; + unsigned int num_gh; + int dir_rename = 0; + struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, }; + unsigned int x; + int error; + + gfs2_holder_mark_uninitialized(&r_gh); + gfs2_holder_mark_uninitialized(&rd_gh); + if (d_really_is_positive(ndentry)) { + nip = GFS2_I(d_inode(ndentry)); + if (ip == nip) + return 0; + } + + error = gfs2_rindex_update(sdp); + if (error) + return error; + + error = gfs2_qa_get(ndip); + if (error) + return error; + + 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 directory into its 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, GL_ASYNC, ghs); + if (odip != ndip) { + gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC, + ghs + num_gh); + num_gh++; + } + gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); + num_gh++; + + if (nip) { + gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, + ghs + num_gh); + num_gh++; + } + + for (x = 0; x < num_gh; x++) { + error = gfs2_glock_nq(ghs + x); + if (error) + goto out_gunlock; + } + error = gfs2_glock_async_wait(num_gh, ghs); + if (error) + goto out_gunlock; + + if (nip) { + /* Grab the resource group glock for unlink flag twiddling. + * This is the case where the target dinode already exists + * so we unlink before doing the rename. + */ + nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); + if (!nrgd) { + error = -ENOENT; + goto out_gunlock; + } + error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, + LM_FLAG_NODE_SCOPE, &rd_gh); + if (error) + goto out_gunlock; + } + + error = -ENOENT; + if (ip->i_inode.i_nlink == 0) + 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 (nip->i_inode.i_nlink == 0) { + error = -EAGAIN; + goto out_gunlock; + } + + if (S_ISDIR(nip->i_inode.i_mode)) { + if (nip->i_entries < 2) { + gfs2_consist_inode(nip); + error = -EIO; + goto out_gunlock; + } + if (nip->i_entries > 2) { + error = -ENOTEMPTY; + goto out_gunlock; + } + } + } else { + error = gfs2_permission(&init_user_ns, 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; + goto out_gunlock; + default: + goto out_gunlock; + } + + if (odip != ndip) { + if (!ndip->i_inode.i_nlink) { + error = -ENOENT; + 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(&init_user_ns, d_inode(odentry), + MAY_WRITE); + if (error) + goto out_gunlock; + } + + if (nip == NULL) { + error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); + if (error) + goto out_gunlock; + } + + if (da.nr_blocks) { + struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; + error = gfs2_quota_lock_check(ndip, &ap); + if (error) + goto out_gunlock; + + error = gfs2_inplace_reserve(ndip, &ap); + if (error) + goto out_gunlock_q; + + error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + + 4 * RES_LEAF + 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) + error = gfs2_unlink_inode(ndip, ndentry); + + error = update_moved_ino(ip, ndip, dir_rename); + if (error) + goto out_end_trans; + + error = gfs2_dir_del(odip, odentry); + if (error) + goto out_end_trans; + + error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); + if (error) + goto out_end_trans; + +out_end_trans: + gfs2_trans_end(sdp); +out_ipreserv: + if (da.nr_blocks) + gfs2_inplace_release(ndip); +out_gunlock_q: + if (da.nr_blocks) + gfs2_quota_unlock(ndip); +out_gunlock: + gfs2_dir_no_add(&da); + if (gfs2_holder_initialized(&rd_gh)) + gfs2_glock_dq_uninit(&rd_gh); + + while (x--) { + if (gfs2_holder_queued(ghs + x)) + gfs2_glock_dq(ghs + x); + gfs2_holder_uninit(ghs + x); + } +out_gunlock_r: + if (gfs2_holder_initialized(&r_gh)) + gfs2_glock_dq_uninit(&r_gh); +out: + gfs2_qa_put(ndip); + return error; +} + +/** + * gfs2_exchange - exchange two files + * @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 + * @flags: The rename flags + * + * Returns: errno + */ + +static int gfs2_exchange(struct inode *odir, struct dentry *odentry, + struct inode *ndir, struct dentry *ndentry, + unsigned int flags) +{ + struct gfs2_inode *odip = GFS2_I(odir); + struct gfs2_inode *ndip = GFS2_I(ndir); + struct gfs2_inode *oip = GFS2_I(odentry->d_inode); + struct gfs2_inode *nip = GFS2_I(ndentry->d_inode); + struct gfs2_sbd *sdp = GFS2_SB(odir); + struct gfs2_holder ghs[4], r_gh; + unsigned int num_gh; + unsigned int x; + umode_t old_mode = oip->i_inode.i_mode; + umode_t new_mode = nip->i_inode.i_mode; + int error; + + gfs2_holder_mark_uninitialized(&r_gh); + error = gfs2_rindex_update(sdp); + if (error) + return error; + + 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(old_mode)) { + /* don't move a directory into its subdir */ + error = gfs2_ok_to_move(oip, ndip); + if (error) + goto out_gunlock_r; + } + + if (S_ISDIR(new_mode)) { + /* don't move a directory into its subdir */ + error = gfs2_ok_to_move(nip, odip); + if (error) + goto out_gunlock_r; + } + } + + num_gh = 1; + gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs); + if (odip != ndip) { + gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, + ghs + num_gh); + num_gh++; + } + gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); + num_gh++; + + gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh); + num_gh++; + + for (x = 0; x < num_gh; x++) { + error = gfs2_glock_nq(ghs + x); + if (error) + goto out_gunlock; + } + + error = gfs2_glock_async_wait(num_gh, ghs); + if (error) + goto out_gunlock; + + error = -ENOENT; + if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0) + goto out_gunlock; + + error = gfs2_unlink_ok(odip, &odentry->d_name, oip); + if (error) + goto out_gunlock; + error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); + if (error) + goto out_gunlock; + + if (S_ISDIR(old_mode)) { + error = gfs2_permission(&init_user_ns, odentry->d_inode, + MAY_WRITE); + if (error) + goto out_gunlock; + } + if (S_ISDIR(new_mode)) { + error = gfs2_permission(&init_user_ns, ndentry->d_inode, + MAY_WRITE); + if (error) + goto out_gunlock; + } + error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0); + if (error) + goto out_gunlock; + + error = update_moved_ino(oip, ndip, S_ISDIR(old_mode)); + if (error) + goto out_end_trans; + + error = update_moved_ino(nip, odip, S_ISDIR(new_mode)); + if (error) + goto out_end_trans; + + error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip, + IF2DT(old_mode)); + if (error) + goto out_end_trans; + + error = gfs2_dir_mvino(odip, &odentry->d_name, nip, + IF2DT(new_mode)); + if (error) + goto out_end_trans; + + if (odip != ndip) { + if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) { + inc_nlink(&odip->i_inode); + drop_nlink(&ndip->i_inode); + } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) { + inc_nlink(&ndip->i_inode); + drop_nlink(&odip->i_inode); + } + } + mark_inode_dirty(&ndip->i_inode); + if (odip != ndip) + mark_inode_dirty(&odip->i_inode); + +out_end_trans: + gfs2_trans_end(sdp); +out_gunlock: + while (x--) { + if (gfs2_holder_queued(ghs + x)) + gfs2_glock_dq(ghs + x); + gfs2_holder_uninit(ghs + x); + } +out_gunlock_r: + if (gfs2_holder_initialized(&r_gh)) + gfs2_glock_dq_uninit(&r_gh); +out: + return error; +} + +static int gfs2_rename2(struct user_namespace *mnt_userns, struct inode *odir, + struct dentry *odentry, struct inode *ndir, + struct dentry *ndentry, unsigned int flags) +{ + flags &= ~RENAME_NOREPLACE; + + if (flags & ~RENAME_EXCHANGE) + return -EINVAL; + + if (flags & RENAME_EXCHANGE) + return gfs2_exchange(odir, odentry, ndir, ndentry, flags); + + return gfs2_rename(odir, odentry, ndir, ndentry); +} + +/** + * gfs2_get_link - Follow a symbolic link + * @dentry: The dentry of the link + * @inode: The inode of the link + * @done: destructor for return value + * + * This can handle symlinks of any size. + * + * Returns: 0 on success or error code + */ + +static const char *gfs2_get_link(struct dentry *dentry, + struct inode *inode, + struct delayed_call *done) +{ + struct gfs2_inode *ip = GFS2_I(inode); + struct gfs2_holder i_gh; + struct buffer_head *dibh; + unsigned int size; + char *buf; + int error; + + if (!dentry) + return ERR_PTR(-ECHILD); + + 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 ERR_PTR(error); + } + + size = (unsigned int)i_size_read(&ip->i_inode); + if (size == 0) { + gfs2_consist_inode(ip); + buf = ERR_PTR(-EIO); + goto out; + } + + error = gfs2_meta_inode_buffer(ip, &dibh); + if (error) { + buf = ERR_PTR(error); + goto out; + } + + buf = kzalloc(size + 1, GFP_NOFS); + if (!buf) + buf = ERR_PTR(-ENOMEM); + else + memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); + brelse(dibh); +out: + gfs2_glock_dq_uninit(&i_gh); + if (!IS_ERR(buf)) + set_delayed_call(done, kfree_link, buf); + return buf; +} + +/** + * gfs2_permission + * @mnt_userns: User namespace of the mount the inode was found from + * @inode: The inode + * @mask: The mask to be tested + * + * 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 user_namespace *mnt_userns, struct inode *inode, + int mask) +{ + int may_not_block = mask & MAY_NOT_BLOCK; + struct gfs2_inode *ip; + struct gfs2_holder i_gh; + struct gfs2_glock *gl; + int error; + + gfs2_holder_mark_uninitialized(&i_gh); + ip = GFS2_I(inode); + gl = rcu_dereference_check(ip->i_gl, !may_not_block); + if (unlikely(!gl)) { + /* inode is getting torn down, must be RCU mode */ + WARN_ON_ONCE(!may_not_block); + return -ECHILD; + } + if (gfs2_glock_is_locked_by_me(gl) == NULL) { + if (may_not_block) + return -ECHILD; + error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); + if (error) + return error; + } + + if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) + error = -EPERM; + else + error = generic_permission(&init_user_ns, inode, mask); + if (gfs2_holder_initialized(&i_gh)) + gfs2_glock_dq_uninit(&i_gh); + + return error; +} + +static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) +{ + setattr_copy(&init_user_ns, inode, attr); + mark_inode_dirty(inode); + return 0; +} + +static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) +{ + int error; + + if (current->journal_info) + return __gfs2_setattr_simple(inode, attr); + + error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); + if (error) + return error; + + error = __gfs2_setattr_simple(inode, attr); + gfs2_trans_end(GFS2_SB(inode)); + 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); + kuid_t ouid, nuid; + kgid_t ogid, ngid; + int error; + struct gfs2_alloc_parms ap; + + ouid = inode->i_uid; + ogid = inode->i_gid; + nuid = attr->ia_uid; + ngid = attr->ia_gid; + + if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) + ouid = nuid = NO_UID_QUOTA_CHANGE; + if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) + ogid = ngid = NO_GID_QUOTA_CHANGE; + error = gfs2_qa_get(ip); + if (error) + return error; + + error = gfs2_rindex_update(sdp); + if (error) + goto out; + + error = gfs2_quota_lock(ip, nuid, ngid); + if (error) + goto out; + + ap.target = gfs2_get_inode_blocks(&ip->i_inode); + + if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || + !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { + error = gfs2_quota_check(ip, nuid, ngid, &ap); + 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_setattr_simple(inode, attr); + if (error) + goto out_end_trans; + + if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || + !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { + gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid); + gfs2_quota_change(ip, ap.target, nuid, ngid); + } + +out_end_trans: + gfs2_trans_end(sdp); +out_gunlock_q: + gfs2_quota_unlock(ip); +out: + gfs2_qa_put(ip); + return error; +} + +/** + * gfs2_setattr - Change attributes on an inode + * @mnt_userns: User namespace of the mount the inode was found from + * @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 user_namespace *mnt_userns, + struct dentry *dentry, struct iattr *attr) +{ + struct inode *inode = d_inode(dentry); + struct gfs2_inode *ip = GFS2_I(inode); + struct gfs2_holder i_gh; + int error; + + error = gfs2_qa_get(ip); + if (error) + return error; + + error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); + if (error) + goto out; + + error = may_setattr(&init_user_ns, inode, attr->ia_valid); + if (error) + goto error; + + error = setattr_prepare(&init_user_ns, dentry, attr); + if (error) + goto error; + + if (attr->ia_valid & ATTR_SIZE) + error = gfs2_setattr_size(inode, attr->ia_size); + else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) + error = setattr_chown(inode, attr); + else { + error = gfs2_setattr_simple(inode, attr); + if (!error && attr->ia_valid & ATTR_MODE) + error = posix_acl_chmod(&init_user_ns, inode, + inode->i_mode); + } + +error: + if (!error) + mark_inode_dirty(inode); + gfs2_glock_dq_uninit(&i_gh); +out: + gfs2_qa_put(ip); + return error; +} + +/** + * gfs2_getattr - Read out an inode's attributes + * @mnt_userns: user namespace of the mount the inode was found from + * @path: Object to query + * @stat: The inode's stats + * @request_mask: Mask of STATX_xxx flags indicating the caller's interests + * @flags: AT_STATX_xxx setting + * + * 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 user_namespace *mnt_userns, + const struct path *path, struct kstat *stat, + u32 request_mask, unsigned int flags) +{ + struct inode *inode = d_inode(path->dentry); + struct gfs2_inode *ip = GFS2_I(inode); + struct gfs2_holder gh; + u32 gfsflags; + int error; + + gfs2_holder_mark_uninitialized(&gh); + 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; + } + + gfsflags = ip->i_diskflags; + if (gfsflags & GFS2_DIF_APPENDONLY) + stat->attributes |= STATX_ATTR_APPEND; + if (gfsflags & GFS2_DIF_IMMUTABLE) + stat->attributes |= STATX_ATTR_IMMUTABLE; + + stat->attributes_mask |= (STATX_ATTR_APPEND | + STATX_ATTR_COMPRESSED | + STATX_ATTR_ENCRYPTED | + STATX_ATTR_IMMUTABLE | + STATX_ATTR_NODUMP); + + generic_fillattr(&init_user_ns, inode, stat); + + if (gfs2_holder_initialized(&gh)) + gfs2_glock_dq_uninit(&gh); + + return 0; +} + +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; + + inode_lock_shared(inode); + + ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); + if (ret) + goto out; + + ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops); + + gfs2_glock_dq_uninit(&gh); + +out: + inode_unlock_shared(inode); + return ret; +} + +loff_t gfs2_seek_data(struct file *file, loff_t offset) +{ + struct inode *inode = file->f_mapping->host; + struct gfs2_inode *ip = GFS2_I(inode); + struct gfs2_holder gh; + loff_t ret; + + inode_lock_shared(inode); + ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); + if (!ret) + ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops); + gfs2_glock_dq_uninit(&gh); + inode_unlock_shared(inode); + + if (ret < 0) + return ret; + return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); +} + +loff_t gfs2_seek_hole(struct file *file, loff_t offset) +{ + struct inode *inode = file->f_mapping->host; + struct gfs2_inode *ip = GFS2_I(inode); + struct gfs2_holder gh; + loff_t ret; + + inode_lock_shared(inode); + ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); + if (!ret) + ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops); + gfs2_glock_dq_uninit(&gh); + inode_unlock_shared(inode); + + if (ret < 0) + return ret; + return vfs_setpos(file, ret, inode->i_sb->s_maxbytes); +} + +static int gfs2_update_time(struct inode *inode, struct timespec64 *time, + int flags) +{ + struct gfs2_inode *ip = GFS2_I(inode); + struct gfs2_glock *gl = ip->i_gl; + struct gfs2_holder *gh; + int error; + + gh = gfs2_glock_is_locked_by_me(gl); + if (gh && !gfs2_glock_is_held_excl(gl)) { + gfs2_glock_dq(gh); + gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh); + error = gfs2_glock_nq(gh); + if (error) + return error; + } + return generic_update_time(inode, time, flags); +} + +static const struct inode_operations gfs2_file_iops = { + .permission = gfs2_permission, + .setattr = gfs2_setattr, + .getattr = gfs2_getattr, + .listxattr = gfs2_listxattr, + .fiemap = gfs2_fiemap, + .get_acl = gfs2_get_acl, + .set_acl = gfs2_set_acl, + .update_time = gfs2_update_time, + .fileattr_get = gfs2_fileattr_get, + .fileattr_set = gfs2_fileattr_set, +}; + +static 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_unlink, + .mknod = gfs2_mknod, + .rename = gfs2_rename2, + .permission = gfs2_permission, + .setattr = gfs2_setattr, + .getattr = gfs2_getattr, + .listxattr = gfs2_listxattr, + .fiemap = gfs2_fiemap, + .get_acl = gfs2_get_acl, + .set_acl = gfs2_set_acl, + .update_time = gfs2_update_time, + .atomic_open = gfs2_atomic_open, + .fileattr_get = gfs2_fileattr_get, + .fileattr_set = gfs2_fileattr_set, +}; + +static const struct inode_operations gfs2_symlink_iops = { + .get_link = gfs2_get_link, + .permission = gfs2_permission, + .setattr = gfs2_setattr, + .getattr = gfs2_getattr, + .listxattr = gfs2_listxattr, + .fiemap = gfs2_fiemap, +}; + |