#include "trans.h"
#include "util.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(-ENOBUFS);
-
- 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_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 == sb->s_root->d_inode)) {
- 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, 0);
- if (error)
- goto out;
- }
-
- inode = gfs2_dir_search(dir, name);
- 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,
- unsigned int mode)
-{
- int error;
-
- error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, 0);
- if (error)
- return error;
-
- /* Don't create entries in an unlinked directory */
- if (!dip->i_inode.i_nlink)
- return -ENOENT;
-
- error = gfs2_dir_check(&dip->i_inode, name, NULL);
- switch (error) {
- case -ENOENT:
- error = 0;
- break;
- case 0:
- return -EEXIST;
- default:
- return error;
- }
-
- 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(struct gfs2_inode *dip, unsigned int *mode,
- unsigned int *uid, unsigned int *gid)
-{
- if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
- (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
- if (S_ISDIR(*mode))
- *mode |= S_ISUID;
- else if (dip->i_inode.i_uid != current_fsuid())
- *mode &= ~07111;
- *uid = dip->i_inode.i_uid;
- } else
- *uid = current_fsuid();
-
- if (dip->i_inode.i_mode & S_ISGID) {
- if (S_ISDIR(*mode))
- *mode |= S_ISGID;
- *gid = dip->i_inode.i_gid;
- } else
- *gid = current_fsgid();
-}
-
-static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
-{
- struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
- int error;
-
- if (gfs2_alloc_get(dip) == NULL)
- return -ENOMEM;
-
- dip->i_alloc->al_requested = RES_DINODE;
- error = gfs2_inplace_reserve(dip);
- if (error)
- goto out;
-
- error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
- if (error)
- goto out_ipreserv;
-
- error = gfs2_alloc_di(dip, no_addr, generation);
-
- gfs2_trans_end(sdp);
-
-out_ipreserv:
- gfs2_inplace_release(dip);
-out:
- gfs2_alloc_put(dip);
- return error;
-}
-
-/**
- * init_dinode - Fill in a new dinode structure
- * @dip: the directory this inode is being created in
- * @gl: The glock covering the new inode
- * @inum: the inode number
- * @mode: the file permissions
- * @uid:
- * @gid:
- *
- */
-
-static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
- const struct gfs2_inum_host *inum, unsigned int mode,
- unsigned int uid, unsigned int gid,
- const u64 *generation, dev_t dev, struct buffer_head **bhp)
-{
- struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
- struct gfs2_dinode *di;
- struct buffer_head *dibh;
- struct timespec tv = CURRENT_TIME;
-
- dibh = gfs2_meta_new(gl, inum->no_addr);
- gfs2_trans_add_bh(gl, dibh, 1);
- gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
- gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
- di = (struct gfs2_dinode *)dibh->b_data;
-
- di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
- di->di_num.no_addr = cpu_to_be64(inum->no_addr);
- di->di_mode = cpu_to_be32(mode);
- di->di_uid = cpu_to_be32(uid);
- di->di_gid = cpu_to_be32(gid);
- di->di_nlink = 0;
- di->di_size = 0;
- di->di_blocks = cpu_to_be64(1);
- di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec);
- di->di_major = cpu_to_be32(MAJOR(dev));
- di->di_minor = cpu_to_be32(MINOR(dev));
- di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
- di->di_generation = cpu_to_be64(*generation);
- di->di_flags = 0;
-
- if (S_ISREG(mode)) {
- if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
- gfs2_tune_get(sdp, gt_new_files_jdata))
- di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
- } else if (S_ISDIR(mode)) {
- di->di_flags |= cpu_to_be32(dip->i_diskflags &
- GFS2_DIF_INHERIT_JDATA);
- }
-
- di->__pad1 = 0;
- di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0);
- di->di_height = 0;
- di->__pad2 = 0;
- di->__pad3 = 0;
- di->di_depth = 0;
- di->di_entries = 0;
- memset(&di->__pad4, 0, sizeof(di->__pad4));
- di->di_eattr = 0;
- di->di_atime_nsec = cpu_to_be32(tv.tv_nsec);
- di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec);
- di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec);
- memset(&di->di_reserved, 0, sizeof(di->di_reserved));
-
- set_buffer_uptodate(dibh);
-
- *bhp = dibh;
-}
-
-static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
- unsigned int mode, const struct gfs2_inum_host *inum,
- const u64 *generation, dev_t dev, struct buffer_head **bhp)
-{
- struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
- unsigned int uid, gid;
- int error;
-
- munge_mode_uid_gid(dip, &mode, &uid, &gid);
- if (!gfs2_alloc_get(dip))
- return -ENOMEM;
-
- error = gfs2_quota_lock(dip, uid, gid);
- if (error)
- goto out;
-
- error = gfs2_quota_check(dip, uid, gid);
- if (error)
- goto out_quota;
-
- error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
- if (error)
- goto out_quota;
-
- init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, bhp);
- gfs2_quota_change(dip, +1, uid, gid);
- gfs2_trans_end(sdp);
-
-out_quota:
- gfs2_quota_unlock(dip);
-out:
- gfs2_alloc_put(dip);
- return error;
-}
-
-static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
- struct gfs2_inode *ip)
-{
- struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
- struct gfs2_alloc *al;
- int alloc_required;
- struct buffer_head *dibh;
- int error;
-
- al = gfs2_alloc_get(dip);
- if (!al)
- return -ENOMEM;
-
- error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
- if (error)
- goto fail;
-
- error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
- if (alloc_required < 0)
- goto fail_quota_locks;
- if (alloc_required) {
- error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
- if (error)
- goto fail_quota_locks;
-
- al->al_requested = sdp->sd_max_dirres;
-
- error = gfs2_inplace_reserve(dip);
- if (error)
- goto fail_quota_locks;
-
- error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
- al->al_rgd->rd_length +
- 2 * RES_DINODE +
- RES_STATFS + RES_QUOTA, 0);
- if (error)
- goto fail_ipreserv;
- } else {
- error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
- if (error)
- goto fail_quota_locks;
- }
-
- error = gfs2_dir_add(&dip->i_inode, name, ip);
- if (error)
- goto fail_end_trans;
-
- error = gfs2_meta_inode_buffer(ip, &dibh);
- if (error)
- goto fail_end_trans;
- ip->i_inode.i_nlink = 1;
- gfs2_trans_add_bh(ip->i_gl, dibh, 1);
- gfs2_dinode_out(ip, dibh->b_data);
- brelse(dibh);
- return 0;
-
-fail_end_trans:
- gfs2_trans_end(sdp);
-
-fail_ipreserv:
- if (dip->i_alloc->al_rgd)
- gfs2_inplace_release(dip);
-
-fail_quota_locks:
- gfs2_quota_unlock(dip);
-
-fail:
- gfs2_alloc_put(dip);
- return error;
-}
-
-static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
- const struct qstr *qstr)
-{
- int err;
- size_t len;
- void *value;
- char *name;
-
- err = security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
- &name, &value, &len);
-
- if (err) {
- if (err == -EOPNOTSUPP)
- return 0;
- return err;
- }
-
- err = __gfs2_xattr_set(&ip->i_inode, name, value, len, 0,
- GFS2_EATYPE_SECURITY);
- kfree(value);
- kfree(name);
-
- return err;
-}
-
-/**
- * gfs2_createi - Create a new inode
- * @ghs: An array of two holders
- * @name: The name of the new file
- * @mode: the permissions on the new inode
- *
- * @ghs[0] is an initialized holder for the directory
- * @ghs[1] is the holder for the inode lock
- *
- * If the return value is not NULL, the glocks on both the directory and the new
- * file are held. A transaction has been started and an inplace reservation
- * is held, as well.
- *
- * Returns: An inode
- */
-
-struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
- unsigned int mode, dev_t dev)
-{
- struct inode *inode = NULL;
- struct gfs2_inode *dip = ghs->gh_gl->gl_object;
- struct inode *dir = &dip->i_inode;
- struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
- struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
- int error;
- u64 generation;
- struct buffer_head *bh = NULL;
-
- if (!name->len || name->len > GFS2_FNAMESIZE)
- return ERR_PTR(-ENAMETOOLONG);
-
- gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
- error = gfs2_glock_nq(ghs);
- if (error)
- goto fail;
-
- error = create_ok(dip, name, mode);
- if (error)
- goto fail_gunlock;
-
- error = alloc_dinode(dip, &inum.no_addr, &generation);
- if (error)
- goto fail_gunlock;
- inum.no_formal_ino = generation;
-
- error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
- LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
- if (error)
- goto fail_gunlock;
-
- error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, &bh);
- if (error)
- goto fail_gunlock2;
-
- inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr,
- inum.no_formal_ino, 0);
- if (IS_ERR(inode))
- goto fail_gunlock2;
-
- error = gfs2_inode_refresh(GFS2_I(inode));
- if (error)
- goto fail_gunlock2;
-
- error = gfs2_acl_create(dip, inode);
- if (error)
- goto fail_gunlock2;
-
- error = gfs2_security_init(dip, GFS2_I(inode), name);
- if (error)
- goto fail_gunlock2;
-
- error = link_dinode(dip, name, GFS2_I(inode));
- if (error)
- goto fail_gunlock2;
-
- if (bh)
- brelse(bh);
- return inode;
-
-fail_gunlock2:
- gfs2_glock_dq_uninit(ghs + 1);
- if (inode && !IS_ERR(inode))
- iput(inode);
-fail_gunlock:
- gfs2_glock_dq(ghs);
-fail:
- if (bh)
- brelse(bh);
- return ERR_PTR(error);
-}
-
-static int __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
-{
- struct inode *inode = &ip->i_inode;
- struct buffer_head *dibh;
- int error;
-
- error = gfs2_meta_inode_buffer(ip, &dibh);
- if (error)
- return error;
-
- setattr_copy(inode, attr);
- mark_inode_dirty(inode);
- gfs2_trans_add_bh(ip->i_gl, dibh, 1);
- gfs2_dinode_out(ip, dibh->b_data);
- brelse(dibh);
- return 0;
-}
-
-/**
- * gfs2_setattr_simple -
- * @ip:
- * @attr:
- *
- * Called with a reference on the vnode.
- *
- * Returns: errno
- */
-
-int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
-{
- int error;
-
- if (current->journal_info)
- return __gfs2_setattr_simple(ip, attr);
-
- error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
- if (error)
- return error;
-
- error = __gfs2_setattr_simple(ip, attr);
- gfs2_trans_end(GFS2_SB(&ip->i_inode));
- return error;
-}
void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
{
git.openpandora.org / pandora-kernel.git / blobdiff