| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Steven Whitehouse | 3417 | 34.92% | 80 | 30.42% |
| David Teigland | 3176 | 32.46% | 1 | 0.38% |
| Andreas Gruenbacher | 878 | 8.97% | 40 | 15.21% |
| Benjamin Marzinski | 794 | 8.11% | 4 | 1.52% |
| Robert S Peterson | 452 | 4.62% | 32 | 12.17% |
| Al Viro | 223 | 2.28% | 28 | 10.65% |
| Christoph Hellwig | 180 | 1.84% | 4 | 1.52% |
| Christian Brauner | 90 | 0.92% | 16 | 6.08% |
| Abhijith Das | 70 | 0.72% | 6 | 2.28% |
| Miklos Szeredi | 70 | 0.72% | 5 | 1.90% |
| Eric W. Biedermann | 59 | 0.60% | 3 | 1.14% |
| S. Wendy Cheng | 54 | 0.55% | 4 | 1.52% |
| David Howells | 54 | 0.55% | 4 | 1.52% |
| Andrew Price | 48 | 0.49% | 2 | 0.76% |
| Mimi Zohar | 45 | 0.46% | 1 | 0.38% |
| Russell Cattelan | 42 | 0.43% | 2 | 0.76% |
| Jeff Layton | 17 | 0.17% | 4 | 1.52% |
| Cheng Renquan | 14 | 0.14% | 2 | 0.76% |
| J. Bruce Fields | 13 | 0.13% | 1 | 0.38% |
| Benjamin Coddington | 11 | 0.11% | 1 | 0.38% |
| Nicholas Piggin | 9 | 0.09% | 1 | 0.38% |
| Linus Torvalds (pre-git) | 7 | 0.07% | 2 | 0.76% |
| Josef Bacik | 7 | 0.07% | 2 | 0.76% |
| Gustavo A. R. Silva | 6 | 0.06% | 1 | 0.38% |
| Deepa Dinamani | 6 | 0.06% | 1 | 0.38% |
| Ryan O'Hara | 6 | 0.06% | 1 | 0.38% |
| Arjan van de Ven | 6 | 0.06% | 1 | 0.38% |
| Tiger Yang | 5 | 0.05% | 1 | 0.38% |
| Linus Torvalds | 5 | 0.05% | 2 | 0.76% |
| Lee Jones | 4 | 0.04% | 1 | 0.38% |
| Ingo Molnar | 3 | 0.03% | 1 | 0.38% |
| Mark Fasheh | 3 | 0.03% | 1 | 0.38% |
| Jan Kara | 2 | 0.02% | 1 | 0.38% |
| Thomas Gleixner | 2 | 0.02% | 1 | 0.38% |
| Andrew Morton | 2 | 0.02% | 1 | 0.38% |
| Fabian Frederick | 1 | 0.01% | 1 | 0.38% |
| Kefeng Wang | 1 | 0.01% | 1 | 0.38% |
| Eryu Guan | 1 | 0.01% | 1 | 0.38% |
| Fabio Massimo Di Nitto | 1 | 0.01% | 1 | 0.38% |
| H Hartley Sweeten | 1 | 0.01% | 1 | 0.38% |
| Total | 9785 | 263 |
// 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; /* * The only caller that sets @blktype to GFS2_BLKST_UNLINKED is * delete_work_func(). Make sure not to cancel the delete work * from within itself here. */ 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_set_atime(inode, 1LL << (8 * sizeof(inode_get_atime_sec(inode)) - 1), 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); if (ip->i_gl) { gfs2_glock_put(ip->i_gl); ip->i_gl = NULL; } 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); } /** * gfs2_lookup_meta - Look up an inode in a metadata directory * @dip: The directory * @name: The name of the inode */ struct inode *gfs2_lookup_meta(struct inode *dip, const char *name) { struct qstr qstr; struct inode *inode; gfs2_str2qstr(&qstr, name); inode = gfs2_lookupi(dip, &qstr, 1); if (IS_ERR_OR_NULL(inode)) return inode ? inode : ERR_PTR(-ENOENT); /* * Must not call back into the filesystem when allocating * pages in the metadata inode's address space. */ mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); 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(&nop_mnt_idmap, 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(&nop_mnt_idmap, &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); if (error) goto out_trans_end; ip->i_no_formal_ino = ip->i_generation; ip->i_inode.i_ino = ip->i_no_addr; ip->i_goal = ip->i_no_addr; if (*dblocks > 1) ip->i_eattr = ip->i_no_addr + 1; out_trans_end: 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 * * FIXME: Change to allocate the disk blocks and write them out in the same * transaction. That way, we can no longer end up in a situation in which an * inode is allocated, the node crashes, and the block looks like a valid * inode. (With atomic creates in place, we will also no longer need to zero * the link count and dirty the inode here on failure.) * * 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 d_gh, gh; 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; 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, &d_gh); if (error) goto fail; gfs2_holder_mark_uninitialized(&gh); 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(&d_gh); 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; ip = GFS2_I(inode); error = posix_acl_create(dir, &mode, &default_acl, &acl); if (error) goto fail_gunlock; 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; simple_inode_init_ts(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); retry: error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr); if (error == -EBUSY) goto retry; if (error) goto fail_gunlock2; 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, &gh); if (error) goto fail_gunlock3; error = gfs2_trans_begin(sdp, blocks, 0); if (error) goto fail_gunlock3; if (blocks > 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); 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(&d_gh); gfs2_qa_put(ip); gfs2_glock_dq_uninit(&gh); 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) { gfs2_glock_put(ip->i_gl); ip->i_gl = NULL; } 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(&d_gh); if (!IS_ERR_OR_NULL(inode)) { set_bit(GIF_ALLOC_FAILED, &ip->i_flags); clear_nlink(inode); if (ip->i_no_addr) mark_inode_dirty(inode); if (inode->i_state & I_NEW) iget_failed(inode); else iput(inode); } if (gfs2_holder_initialized(&gh)) gfs2_glock_dq_uninit(&gh); fail: gfs2_qa_put(dip); return error; } /** * gfs2_create - Create a file * @idmap: idmap 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 mnt_idmap *idmap, 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 d_gh, gh; 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, &d_gh); gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); error = gfs2_glock_nq(&d_gh); if (error) goto out_parent; error = gfs2_glock_nq(&gh); if (error) goto out_child; error = -ENOENT; if (inode->i_nlink == 0) goto out_gunlock; error = gfs2_permission(&nop_mnt_idmap, 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 = -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); inode_set_ctime_current(&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(&gh); out_child: gfs2_glock_dq(&d_gh); out_parent: gfs2_qa_put(dip); gfs2_holder_uninit(&d_gh); gfs2_holder_uninit(&gh); 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(&nop_mnt_idmap, &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_set_ctime_current(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 d_gh, r_gh, gh; 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, &d_gh); gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 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, &r_gh); error = gfs2_glock_nq(&d_gh); if (error) goto out_parent; error = gfs2_glock_nq(&gh); 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(&r_gh); /* 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(&r_gh); out_rgrp: gfs2_glock_dq(&gh); out_child: gfs2_glock_dq(&d_gh); out_parent: gfs2_holder_uninit(&r_gh); out_inodes: gfs2_holder_uninit(&gh); gfs2_holder_uninit(&d_gh); return error; } /** * gfs2_symlink - Create a symlink * @idmap: idmap 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 mnt_idmap *idmap, 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 * @idmap: idmap 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 mnt_idmap *idmap, 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 * @idmap: idmap 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 mnt_idmap *idmap, 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); inode_set_ctime_current(&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(&nop_mnt_idmap, 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(&nop_mnt_idmap, 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(&nop_mnt_idmap, odentry->d_inode, MAY_WRITE); if (error) goto out_gunlock; } if (S_ISDIR(new_mode)) { error = gfs2_permission(&nop_mnt_idmap, 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 mnt_idmap *idmap, 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 * @idmap: idmap 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 mnt_idmap *idmap, 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(&nop_mnt_idmap, 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(&nop_mnt_idmap, 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 * @idmap: idmap 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 mnt_idmap *idmap, 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(&nop_mnt_idmap, inode, attr->ia_valid); if (error) goto error; error = setattr_prepare(&nop_mnt_idmap, 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(&nop_mnt_idmap, dentry, 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 * @idmap: idmap 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 mnt_idmap *idmap, 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(&nop_mnt_idmap, request_mask, 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, 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 && gl->gl_state != LM_ST_EXCLUSIVE) { gfs2_glock_dq(gh); gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh); error = gfs2_glock_nq(gh); if (error) return error; } generic_update_time(inode, flags); return 0; } static const struct inode_operations gfs2_file_iops = { .permission = gfs2_permission, .setattr = gfs2_setattr, .getattr = gfs2_getattr, .listxattr = gfs2_listxattr, .fiemap = gfs2_fiemap, .get_inode_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_inode_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, };
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