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; int error; error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops, LM_ST_SHARED, LM_FLAG_ANY, &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); if (IS_ERR(inode)) goto fail; error = gfs2_inode_refresh(GFS2_I(inode)); if (error) goto fail_iput; /* Pick up the works we bypass in gfs2_inode_lookup */ if (inode->i_state & I_NEW) gfs2_set_iop(inode); /* 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_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_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_glock *io_gl = NULL; struct gfs2_holder i_gh; int error; gfs2_holder_mark_uninitialized(&i_gh); inode = gfs2_iget(sb, 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); 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; flush_delayed_work(&ip->i_gl->gl_work); error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl); if (unlikely(error)) goto fail_put; if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) { /* * The GL_SKIP flag indicates to skip reading the inode * block. We read the inode with gfs2_inode_refresh * 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_put; if (blktype != GFS2_BLKST_FREE) { error = gfs2_check_blk_type(sdp, no_addr, blktype); if (error) goto fail_put; } } glock_set_object(ip->i_gl, ip); 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_put; glock_set_object(ip->i_iopen_gh.gh_gl, 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); /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */ inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1); inode->i_atime.tv_nsec = 0; unlock_new_inode(inode); } if (gfs2_holder_initialized(&i_gh)) gfs2_glock_dq_uninit(&i_gh); return inode; fail_refresh: ip->i_iopen_gh.gh_flags |= GL_NOCACHE; glock_clear_object(ip->i_iopen_gh.gh_gl, ip); gfs2_glock_dq_uninit(&ip->i_iopen_gh); fail_put: if (io_gl) gfs2_glock_put(io_gl); glock_clear_object(ip->i_gl, ip); if (gfs2_holder_initialized(&i_gh)) gfs2_glock_dq_uninit(&i_gh); fail: iget_failed(inode); return ERR_PTR(error); }
static struct dentry *gfs2_get_dentry(struct super_block *sb, struct gfs2_inum_host *inum) { struct gfs2_sbd *sdp = sb->s_fs_info; struct gfs2_holder i_gh; struct inode *inode; struct dentry *dentry; int error; inode = gfs2_ilookup(sb, inum->no_addr); if (inode) { if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) { iput(inode); return ERR_PTR(-ESTALE); } goto out_inode; } error = gfs2_glock_nq_num(sdp, inum->no_addr, &gfs2_inode_glops, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); if (error) return ERR_PTR(error); error = gfs2_check_blk_type(sdp, inum->no_addr, GFS2_BLKST_DINODE); if (error) goto fail; inode = gfs2_inode_lookup(sb, DT_UNKNOWN, inum->no_addr, 0); if (IS_ERR(inode)) { error = PTR_ERR(inode); goto fail; } error = gfs2_inode_refresh(GFS2_I(inode)); if (error) { iput(inode); goto fail; } /* Pick up the works we bypass in gfs2_inode_lookup */ if (inode->i_state & I_NEW) gfs2_set_iop(inode); if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) { iput(inode); goto fail; } error = -EIO; if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) { iput(inode); goto fail; } gfs2_glock_dq_uninit(&i_gh); out_inode: dentry = d_obtain_alias(inode); if (!IS_ERR(dentry)) dentry->d_op = &gfs2_dops; return dentry; fail: gfs2_glock_dq_uninit(&i_gh); return ERR_PTR(error); }