| /* |
| * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
| * Copyright (C) 2004-2011 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/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 <linux/security.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" |
| #include "glops.h" |
| |
| struct gfs2_skip_data { |
| u64 no_addr; |
| int skipped; |
| int non_block; |
| }; |
| |
| static int iget_test(struct inode *inode, void *opaque) |
| { |
| struct gfs2_inode *ip = GFS2_I(inode); |
| struct gfs2_skip_data *data = opaque; |
| |
| if (ip->i_no_addr == data->no_addr) { |
| if (data->non_block && |
| inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) { |
| data->skipped = 1; |
| return 0; |
| } |
| return 1; |
| } |
| return 0; |
| } |
| |
| static int iget_set(struct inode *inode, void *opaque) |
| { |
| struct gfs2_inode *ip = GFS2_I(inode); |
| struct gfs2_skip_data *data = opaque; |
| |
| if (data->skipped) |
| return -ENOENT; |
| inode->i_ino = (unsigned long)(data->no_addr); |
| ip->i_no_addr = data->no_addr; |
| return 0; |
| } |
| |
| struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block) |
| { |
| unsigned long hash = (unsigned long)no_addr; |
| struct gfs2_skip_data data; |
| |
| data.no_addr = no_addr; |
| data.skipped = 0; |
| data.non_block = non_block; |
| return ilookup5(sb, hash, iget_test, &data); |
| } |
| |
| static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr, |
| int non_block) |
| { |
| struct gfs2_skip_data data; |
| unsigned long hash = (unsigned long)no_addr; |
| |
| data.no_addr = no_addr; |
| data.skipped = 0; |
| data.non_block = non_block; |
| return iget5_locked(sb, hash, iget_test, iget_set, &data); |
| } |
| |
| /** |
| * 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); |
| } |
| } |
| |
| /** |
| * gfs2_inode_lookup - Lookup an inode |
| * @sb: The super block |
| * @no_addr: The inode number |
| * @type: The type of the inode |
| * non_block: Can we block on inodes that are being freed? |
| * |
| * 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, int non_block) |
| { |
| struct inode *inode; |
| struct gfs2_inode *ip; |
| struct gfs2_glock *io_gl = NULL; |
| int error; |
| |
| inode = gfs2_iget(sb, no_addr, non_block); |
| ip = GFS2_I(inode); |
| |
| if (!inode) |
| return ERR_PTR(-ENOMEM); |
| |
| if (inode->i_state & I_NEW) { |
| struct gfs2_sbd *sdp = GFS2_SB(inode); |
| ip->i_no_formal_ino = no_formal_ino; |
| |
| error = gfs2_glock_get(sdp, 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, 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; |
| |
| ip->i_iopen_gh.gh_gl->gl_object = ip; |
| gfs2_glock_put(io_gl); |
| io_gl = NULL; |
| |
| if (type == DT_UNKNOWN) { |
| /* Inode glock must be locked already */ |
| error = gfs2_inode_refresh(GFS2_I(inode)); |
| if (error) |
| goto fail_refresh; |
| } else { |
| inode->i_mode = DT2IF(type); |
| } |
| |
| gfs2_set_iop(inode); |
| unlock_new_inode(inode); |
| } |
| |
| return inode; |
| |
| fail_refresh: |
| ip->i_iopen_gh.gh_flags |= GL_NOCACHE; |
| ip->i_iopen_gh.gh_gl->gl_object = NULL; |
| gfs2_glock_dq_uninit(&ip->i_iopen_gh); |
| fail_iopen: |
| if (io_gl) |
| gfs2_glock_put(io_gl); |
| fail_put: |
| ip->i_gl->gl_object = NULL; |
| gfs2_glock_put(ip->i_gl); |
| fail: |
| iget_failed(inode); |
| return ERR_PTR(error); |
| } |
| |
| 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 gfs2_holder i_gh; |
| struct inode *inode = NULL; |
| int error; |
| |
| /* Must not read in block until block type is verified */ |
| error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops, |
| LM_ST_EXCLUSIVE, GL_SKIP, &i_gh); |
| if (error) |
| return ERR_PTR(error); |
| |
| error = gfs2_check_blk_type(sdp, no_addr, blktype); |
| if (error) |
| goto fail; |
| |
| inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1); |
| if (IS_ERR(inode)) |
| goto fail; |
| |
| /* Two extra checks for NFS only */ |
| if (no_formal_ino) { |
| error = -ESTALE; |
| if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino) |
| goto fail_iput; |
| |
| error = -EIO; |
| if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) |
| goto fail_iput; |
| |
| error = 0; |
| } |
| |
| fail: |
| gfs2_glock_dq_uninit(&i_gh); |
| return error ? ERR_PTR(error) : inode; |
| fail_iput: |
| iput(inode); |
| goto fail; |
| } |
| |
| |
| 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 |
| * @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 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; |
| 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 == 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); |
| unlock = 1; |
| } |
| |
| if (!is_root) { |
| error = gfs2_permission(dir, MAY_EXEC); |
| if (error) |
| goto out; |
| } |
| |
| inode = gfs2_dir_search(dir, name, false); |
| if (IS_ERR(inode)) |
| error = PTR_ERR(inode); |
| out: |
| if (unlock) |
| 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(&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) |
| * @bhp: The buffer head (returned to caller) |
| * |
| */ |
| |
| 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(MAJOR(ip->i_inode.i_rdev)); |
| di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev)); |
| 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_blocks - 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) |
| * |
| * 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, int *opened) |
| { |
| 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 = 0; |
| 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_rs_alloc(dip); |
| if (error) |
| return error; |
| |
| error = gfs2_rindex_update(sdp); |
| if (error) |
| return error; |
| |
| error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
| if (error) |
| goto fail; |
| |
| 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, opened); |
| else |
| error = finish_no_open(file, NULL); |
| } |
| gfs2_glock_dq_uninit(ghs); |
| return error; |
| } 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_free_vfs_inode; |
| |
| ip = GFS2_I(inode); |
| error = gfs2_rs_alloc(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; |
| gfs2_set_inode_blocks(inode, 1); |
| 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; |
| |
| 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; |
| } |
| 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; |
| |
| ip->i_gl->gl_object = ip; |
| error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); |
| if (error) |
| goto fail_free_inode; |
| |
| error = gfs2_trans_begin(sdp, blocks, 0); |
| if (error) |
| goto fail_gunlock2; |
| |
| if (blocks > 1) { |
| ip->i_eattr = ip->i_no_addr + 1; |
| gfs2_init_xattr(ip); |
| } |
| init_dinode(dip, ip, symname); |
| gfs2_trans_end(sdp); |
| |
| error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); |
| if (error) |
| goto fail_gunlock2; |
| |
| error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); |
| if (error) |
| goto fail_gunlock2; |
| |
| ip->i_iopen_gh.gh_gl->gl_object = ip; |
| gfs2_glock_put(io_gl); |
| gfs2_set_iop(inode); |
| insert_inode_hash(inode); |
| |
| if (default_acl) { |
| error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); |
| posix_acl_release(default_acl); |
| } |
| if (acl) { |
| if (!error) |
| error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); |
| posix_acl_release(acl); |
| } |
| |
| if (error) |
| goto fail_gunlock3; |
| |
| error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name, |
| &gfs2_initxattrs, NULL); |
| if (error) |
| goto fail_gunlock3; |
| |
| error = link_dinode(dip, name, ip, &da); |
| if (error) |
| goto fail_gunlock3; |
| |
| mark_inode_dirty(inode); |
| d_instantiate(dentry, inode); |
| if (file) { |
| *opened |= FILE_CREATED; |
| error = finish_open(file, dentry, gfs2_open_common, opened); |
| } |
| gfs2_glock_dq_uninit(ghs); |
| gfs2_glock_dq_uninit(ghs + 1); |
| return error; |
| |
| fail_gunlock3: |
| gfs2_glock_dq_uninit(ghs + 1); |
| if (ip->i_gl) |
| gfs2_glock_put(ip->i_gl); |
| goto fail_gunlock; |
| |
| fail_gunlock2: |
| gfs2_glock_dq_uninit(ghs + 1); |
| fail_free_inode: |
| if (ip->i_gl) |
| gfs2_glock_put(ip->i_gl); |
| gfs2_rs_delete(ip, NULL); |
| fail_free_acls: |
| if (default_acl) |
| posix_acl_release(default_acl); |
| if (acl) |
| posix_acl_release(acl); |
| fail_free_vfs_inode: |
| free_vfs_inode = 1; |
| fail_gunlock: |
| gfs2_dir_no_add(&da); |
| gfs2_glock_dq_uninit(ghs); |
| if (inode && !IS_ERR(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); |
| iput(inode); |
| } |
| fail: |
| return error; |
| } |
| |
| /** |
| * 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, |
| umode_t mode, bool excl) |
| { |
| return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL); |
| } |
| |
| /** |
| * __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 |
| * @opened: atomic_open flags |
| * |
| * |
| * Returns: errno |
| */ |
| |
| static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, |
| struct file *file, int *opened) |
| { |
| 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, opened); |
| |
| 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, 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_rs_alloc(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(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; |
| |
| 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; |
| 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_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(&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 |
| * @name: The name of the entry in the parent directory |
| * @inode: The inode to be removed |
| * |
| * 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; |
| 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, 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 = -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_end_trans; |
| |
| error = gfs2_unlink_inode(dip, dentry); |
| |
| out_end_trans: |
| 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 |
| * @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_sbd *sdp = GFS2_SB(dir); |
| unsigned int size; |
| |
| size = strlen(symname); |
| if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) |
| return -ENAMETOOLONG; |
| |
| return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL); |
| } |
| |
| /** |
| * 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, umode_t mode) |
| { |
| struct gfs2_sbd *sdp = GFS2_SB(dir); |
| unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); |
| return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL); |
| } |
| |
| /** |
| * 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 |
| * @dev: The device specification of the special file |
| * |
| */ |
| |
| static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, |
| dev_t dev) |
| { |
| return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL); |
| } |
| |
| /** |
| * 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 |
| * @opened: Flag to say whether the file has been opened or not |
| * |
| * 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, int *opened) |
| { |
| struct dentry *d; |
| bool excl = !!(flags & O_EXCL); |
| |
| if (!d_unhashed(dentry)) |
| goto skip_lookup; |
| |
| d = __gfs2_lookup(dir, dentry, file, opened); |
| if (IS_ERR(d)) |
| return PTR_ERR(d); |
| if (d != NULL) |
| dentry = d; |
| if (d_really_is_positive(dentry)) { |
| if (!(*opened & FILE_OPENED)) |
| return finish_no_open(file, d); |
| dput(d); |
| return 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, opened); |
| } |
| |
| /* |
| * 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; |
| } |
| |
| /** |
| * 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[5], r_gh = { .gh_gl = NULL, }; |
| 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; |
| |
| 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_rs_alloc(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 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, 1); |
| 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; |
| } |
| |
| 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(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 = -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(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); |
| |
| if (dir_rename) { |
| error = gfs2_dir_mvino(ip, &gfs2_qdotdot, 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_meta(ip->i_gl, dibh); |
| gfs2_dinode_out(ip, dibh->b_data); |
| brelse(dibh); |
| } |
| |
| 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); |
| 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_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. |
| * |
| * Returns: 0 on success or error code |
| */ |
| |
| static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) |
| { |
| struct gfs2_inode *ip = GFS2_I(d_inode(dentry)); |
| struct gfs2_holder i_gh; |
| struct buffer_head *dibh; |
| unsigned int size; |
| char *buf; |
| 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); |
| nd_set_link(nd, ERR_PTR(error)); |
| return NULL; |
| } |
| |
| 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); |
| nd_set_link(nd, buf); |
| return NULL; |
| } |
| |
| /** |
| * gfs2_permission - |
| * @inode: The inode |
| * @mask: The mask to be tested |
| * @flags: Indicates whether this is an RCU path walk or not |
| * |
| * 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; |
| struct gfs2_holder i_gh; |
| int error; |
| int unlock = 0; |
| |
| |
| ip = GFS2_I(inode); |
| if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { |
| if (mask & MAY_NOT_BLOCK) |
| return -ECHILD; |
| 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); |
| if (unlock) |
| gfs2_glock_dq_uninit(&i_gh); |
| |
| return error; |
| } |
| |
| static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) |
| { |
| setattr_copy(inode, attr); |
| mark_inode_dirty(inode); |
| return 0; |
| } |
| |
| /** |
| * gfs2_setattr_simple - |
| * @ip: |
| * @attr: |
| * |
| * Returns: errno |
| */ |
| |
| 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 = get_write_access(inode); |
| if (error) |
| return error; |
| |
| error = gfs2_rs_alloc(ip); |
| if (error) |
| goto out; |
| |
| 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, -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: |
| put_write_access(inode); |
| 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 = d_inode(dentry); |
| struct gfs2_inode *ip = GFS2_I(inode); |
| struct gfs2_holder i_gh; |
| int error; |
| |
| error = gfs2_rs_alloc(ip); |
| if (error) |
| return 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 = setattr_prepare(dentry, attr); |
| if (error) |
| goto out; |
| |
| 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(inode, inode->i_mode); |
| } |
| |
| out: |
| if (!error) |
| mark_inode_dirty(inode); |
| gfs2_glock_dq_uninit(&i_gh); |
| 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 = d_inode(dentry); |
| 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 = d_inode(dentry); |
| 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 = gfs2_rs_alloc(ip); |
| 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 = d_inode(dentry); |
| struct gfs2_inode *ip = GFS2_I(inode); |
| struct gfs2_holder gh; |
| int ret; |
| |
| /* For selinux during lookup */ |
| if (gfs2_glock_is_locked_by_me(ip->i_gl)) |
| return generic_getxattr(dentry, name, data, size); |
| |
| 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 = d_inode(dentry); |
| 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 = gfs2_rs_alloc(ip); |
| 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, |
| .get_acl = gfs2_get_acl, |
| .set_acl = gfs2_set_acl, |
| }; |
| |
| 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_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, |
| .get_acl = gfs2_get_acl, |
| .set_acl = gfs2_set_acl, |
| .atomic_open = gfs2_atomic_open, |
| }; |
| |
| const struct inode_operations gfs2_symlink_iops = { |
| .readlink = generic_readlink, |
| .follow_link = gfs2_follow_link, |
| .put_link = kfree_put_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, |
| }; |
| |