diff options
| -rw-r--r-- | fs/Makefile | 2 | ||||
| -rw-r--r-- | fs/configfs/dir.c | 137 | ||||
| -rw-r--r-- | fs/ocfs2/aops.c | 46 | ||||
| -rw-r--r-- | fs/ocfs2/aops.h | 4 | ||||
| -rw-r--r-- | fs/ocfs2/extent_map.c | 6 | ||||
| -rw-r--r-- | fs/ocfs2/file.c | 86 | ||||
| -rw-r--r-- | fs/ocfs2/journal.c | 8 | ||||
| -rw-r--r-- | fs/ocfs2/uptodate.c | 4 | ||||
| -rw-r--r-- | fs/ocfs2/vote.c | 6 |
9 files changed, 213 insertions, 86 deletions
diff --git a/fs/Makefile b/fs/Makefile index 83bf478e786..078d3d1191a 100644 --- a/fs/Makefile +++ b/fs/Makefile @@ -45,6 +45,7 @@ obj-$(CONFIG_DNOTIFY) += dnotify.o obj-$(CONFIG_PROC_FS) += proc/ obj-y += partitions/ obj-$(CONFIG_SYSFS) += sysfs/ +obj-$(CONFIG_CONFIGFS_FS) += configfs/ obj-y += devpts/ obj-$(CONFIG_PROFILING) += dcookies.o @@ -100,5 +101,4 @@ obj-$(CONFIG_BEFS_FS) += befs/ obj-$(CONFIG_HOSTFS) += hostfs/ obj-$(CONFIG_HPPFS) += hppfs/ obj-$(CONFIG_DEBUG_FS) += debugfs/ -obj-$(CONFIG_CONFIGFS_FS) += configfs/ obj-$(CONFIG_OCFS2_FS) += ocfs2/ diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c index 5638c8f9362..5f952187fc5 100644 --- a/fs/configfs/dir.c +++ b/fs/configfs/dir.c @@ -505,13 +505,15 @@ static int populate_groups(struct config_group *group) int i; if (group->default_groups) { - /* FYI, we're faking mkdir here + /* + * FYI, we're faking mkdir here * I'm not sure we need this semaphore, as we're called * from our parent's mkdir. That holds our parent's * i_mutex, so afaik lookup cannot continue through our * parent to find us, let alone mess with our tree. * That said, taking our i_mutex is closer to mkdir - * emulation, and shouldn't hurt. */ + * emulation, and shouldn't hurt. + */ mutex_lock(&dentry->d_inode->i_mutex); for (i = 0; group->default_groups[i]; i++) { @@ -546,20 +548,34 @@ static void unlink_obj(struct config_item *item) item->ci_group = NULL; item->ci_parent = NULL; + + /* Drop the reference for ci_entry */ config_item_put(item); + /* Drop the reference for ci_parent */ config_group_put(group); } } static void link_obj(struct config_item *parent_item, struct config_item *item) { - /* Parent seems redundant with group, but it makes certain - * traversals much nicer. */ + /* + * Parent seems redundant with group, but it makes certain + * traversals much nicer. + */ item->ci_parent = parent_item; + + /* + * We hold a reference on the parent for the child's ci_parent + * link. + */ item->ci_group = config_group_get(to_config_group(parent_item)); list_add_tail(&item->ci_entry, &item->ci_group->cg_children); + /* + * We hold a reference on the child for ci_entry on the parent's + * cg_children + */ config_item_get(item); } @@ -684,6 +700,10 @@ static void client_drop_item(struct config_item *parent_item, type = parent_item->ci_type; BUG_ON(!type); + /* + * If ->drop_item() exists, it is responsible for the + * config_item_put(). + */ if (type->ct_group_ops && type->ct_group_ops->drop_item) type->ct_group_ops->drop_item(to_config_group(parent_item), item); @@ -694,23 +714,28 @@ static void client_drop_item(struct config_item *parent_item, static int configfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) { - int ret; + int ret, module_got = 0; struct config_group *group; struct config_item *item; struct config_item *parent_item; struct configfs_subsystem *subsys; struct configfs_dirent *sd; struct config_item_type *type; - struct module *owner; + struct module *owner = NULL; char *name; - if (dentry->d_parent == configfs_sb->s_root) - return -EPERM; + if (dentry->d_parent == configfs_sb->s_root) { + ret = -EPERM; + goto out; + } sd = dentry->d_parent->d_fsdata; - if (!(sd->s_type & CONFIGFS_USET_DIR)) - return -EPERM; + if (!(sd->s_type & CONFIGFS_USET_DIR)) { + ret = -EPERM; + goto out; + } + /* Get a working ref for the duration of this function */ parent_item = configfs_get_config_item(dentry->d_parent); type = parent_item->ci_type; subsys = to_config_group(parent_item)->cg_subsys; @@ -719,15 +744,16 @@ static int configfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) if (!type || !type->ct_group_ops || (!type->ct_group_ops->make_group && !type->ct_group_ops->make_item)) { - config_item_put(parent_item); - return -EPERM; /* What lack-of-mkdir returns */ + ret = -EPERM; /* Lack-of-mkdir returns -EPERM */ + goto out_put; } name = kmalloc(dentry->d_name.len + 1, GFP_KERNEL); if (!name) { - config_item_put(parent_item); - return -ENOMEM; + ret = -ENOMEM; + goto out_put; } + snprintf(name, dentry->d_name.len + 1, "%s", dentry->d_name.name); down(&subsys->su_sem); @@ -748,40 +774,67 @@ static int configfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) kfree(name); if (!item) { - config_item_put(parent_item); - return -ENOMEM; + /* + * If item == NULL, then link_obj() was never called. + * There are no extra references to clean up. + */ + ret = -ENOMEM; + goto out_put; } - ret = -EINVAL; + /* + * link_obj() has been called (via link_group() for groups). + * From here on out, errors must clean that up. + */ + type = item->ci_type; - if (type) { - owner = type->ct_owner; - if (try_module_get(owner)) { - if (group) { - ret = configfs_attach_group(parent_item, - item, - dentry); - } else { - ret = configfs_attach_item(parent_item, - item, - dentry); - } + if (!type) { + ret = -EINVAL; + goto out_unlink; + } - if (ret) { - down(&subsys->su_sem); - if (group) - unlink_group(group); - else - unlink_obj(item); - client_drop_item(parent_item, item); - up(&subsys->su_sem); + owner = type->ct_owner; + if (!try_module_get(owner)) { + ret = -EINVAL; + goto out_unlink; + } - config_item_put(parent_item); - module_put(owner); - } - } + /* + * I hate doing it this way, but if there is + * an error, module_put() probably should + * happen after any cleanup. + */ + module_got = 1; + + if (group) + ret = configfs_attach_group(parent_item, item, dentry); + else + ret = configfs_attach_item(parent_item, item, dentry); + +out_unlink: + if (ret) { + /* Tear down everything we built up */ + down(&subsys->su_sem); + if (group) + unlink_group(group); + else + unlink_obj(item); + client_drop_item(parent_item, item); + up(&subsys->su_sem); + + if (module_got) + module_put(owner); } +out_put: + /* + * link_obj()/link_group() took a reference from child->parent, + * so the parent is safely pinned. We can drop our working + * reference. + */ + config_item_put(parent_item); + +out: return ret; } @@ -801,6 +854,7 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry) if (sd->s_type & CONFIGFS_USET_DEFAULT) return -EPERM; + /* Get a working ref until we have the child */ parent_item = configfs_get_config_item(dentry->d_parent); subsys = to_config_group(parent_item)->cg_subsys; BUG_ON(!subsys); @@ -817,6 +871,7 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry) return ret; } + /* Get a working ref for the duration of this function */ item = configfs_get_config_item(dentry); /* Drop reference from above, item already holds one. */ diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c index 0d858d0b25b..47152bf9a7f 100644 --- a/fs/ocfs2/aops.c +++ b/fs/ocfs2/aops.c @@ -276,13 +276,29 @@ static int ocfs2_writepage(struct page *page, struct writeback_control *wbc) return ret; } +/* This can also be called from ocfs2_write_zero_page() which has done + * it's own cluster locking. */ +int ocfs2_prepare_write_nolock(struct inode *inode, struct page *page, + unsigned from, unsigned to) +{ + int ret; + + down_read(&OCFS2_I(inode)->ip_alloc_sem); + + ret = block_prepare_write(page, from, to, ocfs2_get_block); + + up_read(&OCFS2_I(inode)->ip_alloc_sem); + + return ret; +} + /* * ocfs2_prepare_write() can be an outer-most ocfs2 call when it is called * from loopback. It must be able to perform its own locking around * ocfs2_get_block(). */ -int ocfs2_prepare_write(struct file *file, struct page *page, - unsigned from, unsigned to) +static int ocfs2_prepare_write(struct file *file, struct page *page, + unsigned from, unsigned to) { struct inode *inode = page->mapping->host; int ret; @@ -295,11 +311,7 @@ int ocfs2_prepare_write(struct file *file, struct page *page, goto out; } - down_read(&OCFS2_I(inode)->ip_alloc_sem); - - ret = block_prepare_write(page, from, to, ocfs2_get_block); - - up_read(&OCFS2_I(inode)->ip_alloc_sem); + ret = ocfs2_prepare_write_nolock(inode, page, from, to); ocfs2_meta_unlock(inode, 0); out: @@ -625,11 +637,31 @@ static ssize_t ocfs2_direct_IO(int rw, int ret; mlog_entry_void(); + + /* + * We get PR data locks even for O_DIRECT. This allows + * concurrent O_DIRECT I/O but doesn't let O_DIRECT with + * extending and buffered zeroing writes race. If they did + * race then the buffered zeroing could be written back after + * the O_DIRECT I/O. It's one thing to tell people not to mix + * buffered and O_DIRECT writes, but expecting them to + * understand that file extension is also an implicit buffered + * write is too much. By getting the PR we force writeback of + * the buffered zeroing before proceeding. + */ + ret = ocfs2_data_lock(inode, 0); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + ocfs2_data_unlock(inode, 0); + ret = blockdev_direct_IO_no_locking(rw, iocb, inode, inode->i_sb->s_bdev, iov, offset, nr_segs, ocfs2_direct_IO_get_blocks, ocfs2_dio_end_io); +out: mlog_exit(ret); return ret; } diff --git a/fs/ocfs2/aops.h b/fs/ocfs2/aops.h index d40456d509a..e88c3f0b8fa 100644 --- a/fs/ocfs2/aops.h +++ b/fs/ocfs2/aops.h @@ -22,8 +22,8 @@ #ifndef OCFS2_AOPS_H #define OCFS2_AOPS_H -int ocfs2_prepare_write(struct file *file, struct page *page, - unsigned from, unsigned to); +int ocfs2_prepare_write_nolock(struct inode *inode, struct page *page, + unsigned from, unsigned to); struct ocfs2_journal_handle *ocfs2_start_walk_page_trans(struct inode *inode, struct page *page, diff --git a/fs/ocfs2/extent_map.c b/fs/ocfs2/extent_map.c index 4601fc256f1..1a5c69071df 100644 --- a/fs/ocfs2/extent_map.c +++ b/fs/ocfs2/extent_map.c @@ -569,7 +569,7 @@ static int ocfs2_extent_map_insert(struct inode *inode, ret = -ENOMEM; ctxt.new_ent = kmem_cache_alloc(ocfs2_em_ent_cachep, - GFP_KERNEL); + GFP_NOFS); if (!ctxt.new_ent) { mlog_errno(ret); return ret; @@ -583,14 +583,14 @@ static int ocfs2_extent_map_insert(struct inode *inode, if (ctxt.need_left && !ctxt.left_ent) { ctxt.left_ent = kmem_cache_alloc(ocfs2_em_ent_cachep, - GFP_KERNEL); + GFP_NOFS); if (!ctxt.left_ent) break; } if (ctxt.need_right && !ctxt.right_ent) { ctxt.right_ent = kmem_cache_alloc(ocfs2_em_ent_cachep, - GFP_KERNEL); + GFP_NOFS); if (!ctxt.right_ent) break; } diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c index 581eb451a41..a9559c87453 100644 --- a/fs/ocfs2/file.c +++ b/fs/ocfs2/file.c @@ -613,7 +613,8 @@ leave: /* Some parts of this taken from generic_cont_expand, which turned out * to be too fragile to do exactly what we need without us having to - * worry about recursive locking in ->commit_write(). */ + * worry about recursive locking in ->prepare_write() and + * ->commit_write(). */ static int ocfs2_write_zero_page(struct inode *inode, u64 size) { @@ -641,7 +642,7 @@ static int ocfs2_write_zero_page(struct inode *inode, goto out; } - ret = ocfs2_prepare_write(NULL, page, offset, offset); + ret = ocfs2_prepare_write_nolock(inode, page, offset, offset); if (ret < 0) { mlog_errno(ret); goto out_unlock; @@ -695,13 +696,26 @@ out: return ret; } +/* + * A tail_to_skip value > 0 indicates that we're being called from + * ocfs2_file_aio_write(). This has the following implications: + * + * - we don't want to update i_size + * - di_bh will be NULL, which is fine because it's only used in the + * case where we want to update i_size. + * - ocfs2_zero_extend() will then only be filling the hole created + * between i_size and the start of the write. + */ static int ocfs2_extend_file(struct inode *inode, struct buffer_head *di_bh, - u64 new_i_size) + u64 new_i_size, + size_t tail_to_skip) { int ret = 0; u32 clusters_to_add; + BUG_ON(!tail_to_skip && !di_bh); + /* setattr sometimes calls us like this. */ if (new_i_size == 0) goto out; @@ -714,27 +728,44 @@ static int ocfs2_extend_file(struct inode *inode, OCFS2_I(inode)->ip_clusters; if (clusters_to_add) { - ret = ocfs2_extend_allocation(inode, clusters_to_add); + /* + * protect the pages that ocfs2_zero_extend is going to + * be pulling into the page cache.. we do this before the + * metadata extend so that we don't get into the situation + * where we've extended the metadata but can't get the data + * lock to zero. + */ + ret = ocfs2_data_lock(inode, 1); if (ret < 0) { mlog_errno(ret); goto out; } - ret = ocfs2_zero_extend(inode, new_i_size); + ret = ocfs2_extend_allocation(inode, clusters_to_add); if (ret < 0) { mlog_errno(ret); - goto out; + goto out_unlock; } - } - /* No allocation required, we just use this helper to - * do a trivial update of i_size. */ - ret = ocfs2_simple_size_update(inode, di_bh, new_i_size); - if (ret < 0) { - mlog_errno(ret); - goto out; + ret = ocfs2_zero_extend(inode, (u64)new_i_size - tail_to_skip); + if (ret < 0) { + mlog_errno(ret); + goto out_unlock; + } + } + + if (!tail_to_skip) { + /* We're being called from ocfs2_setattr() which wants + * us to update i_size */ + ret = ocfs2_simple_size_update(inode, di_bh, new_i_size); + if (ret < 0) + mlog_errno(ret); } +out_unlock: + if (clusters_to_add) /* this is the only case in which we lock */ + ocfs2_data_unlock(inode, 1); + out: return ret; } @@ -793,7 +824,7 @@ int ocfs2_setattr(struct dentry *dentry, struct iattr *attr) if (i_size_read(inode) > attr->ia_size) status = ocfs2_truncate_file(inode, bh, attr->ia_size); else - status = ocfs2_extend_file(inode, bh, attr->ia_size); + status = ocfs2_extend_file(inode, bh, attr->ia_size, 0); if (status < 0) { if (status != -ENOSPC) mlog_errno(status); @@ -1049,21 +1080,12 @@ static ssize_t ocfs2_file_aio_write(struct kiocb *iocb, if (!clusters) break; - ret = ocfs2_extend_allocation(inode, clusters); + ret = ocfs2_extend_file(inode, NULL, newsize, count); if (ret < 0) { if (ret != -ENOSPC) mlog_errno(ret); goto out; } - - /* Fill any holes which would've been created by this - * write. If we're O_APPEND, this will wind up - * (correctly) being a noop. */ - ret = ocfs2_zero_extend(inode, (u64) newsize - count); - if (ret < 0) { - mlog_errno(ret); - goto out; - } break; } @@ -1146,6 +1168,22 @@ static ssize_t ocfs2_file_aio_read(struct kiocb *iocb, ocfs2_iocb_set_rw_locked(iocb); } + /* + * We're fine letting folks race truncates and extending + * writes with read across the cluster, just like they can + * locally. Hence no rw_lock during read. + * + * Take and drop the meta data lock to update inode fields + * like i_size. This allows the checks down below + * generic_file_aio_read() a chance of actually working. + */ + ret = ocfs2_meta_lock(inode, NULL, NULL, 0); + if (ret < 0) { + mlog_errno(ret); + goto bail; + } + ocfs2_meta_unlock(inode, 0); + ret = generic_file_aio_read(iocb, buf, count, iocb->ki_pos); if (ret == -EINVAL) mlog(ML_ERROR, "generic_file_aio_read returned -EINVAL\n"); diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c index 6a610ae5358..eebc3cfa6be 100644 --- a/fs/ocfs2/journal.c +++ b/fs/ocfs2/journal.c @@ -117,7 +117,7 @@ struct ocfs2_journal_handle *ocfs2_alloc_handle(struct ocfs2_super *osb) { struct ocfs2_journal_handle *retval = NULL; - retval = kcalloc(1, sizeof(*retval), GFP_KERNEL); + retval = kcalloc(1, sizeof(*retval), GFP_NOFS); if (!retval) { mlog(ML_ERROR, "Failed to allocate memory for journal " "handle!\n"); @@ -870,9 +870,11 @@ static int ocfs2_force_read_journal(struct inode *inode) if (p_blocks > CONCURRENT_JOURNAL_FILL) p_blocks = CONCURRENT_JOURNAL_FILL; + /* We are reading journal data which should not + * be put in the uptodate cache */ status = ocfs2_read_blocks(OCFS2_SB(inode->i_sb), p_blkno, p_blocks, bhs, 0, - inode); + NULL); if (status < 0) { mlog_errno(status); goto bail; @@ -982,7 +984,7 @@ static void ocfs2_queue_recovery_completion(struct ocfs2_journal *journal, { struct ocfs2_la_recovery_item *item; - item = kmalloc(sizeof(struct ocfs2_la_recovery_item), GFP_KERNEL); + item = kmalloc(sizeof(struct ocfs2_la_recovery_item), GFP_NOFS); if (!item) { /* Though we wish to avoid it, we are in fact safe in * skipping local alloc cleanup as fsck.ocfs2 is more diff --git a/fs/ocfs2/uptodate.c b/fs/ocfs2/uptodate.c index 04a684dfdd9..b8a00a79332 100644 --- a/fs/ocfs2/uptodate.c +++ b/fs/ocfs2/uptodate.c @@ -337,7 +337,7 @@ static void __ocfs2_set_buffer_uptodate(struct ocfs2_inode_info *oi, (unsigned long long)oi->ip_blkno, (unsigned long long)block, expand_tree); - new = kmem_cache_alloc(ocfs2_uptodate_cachep, GFP_KERNEL); + new = kmem_cache_alloc(ocfs2_uptodate_cachep, GFP_NOFS); if (!new) { mlog_errno(-ENOMEM); return; @@ -349,7 +349,7 @@ static void __ocfs2_set_buffer_uptodate(struct ocfs2_inode_info *oi, * has no way of tracking that. */ for(i = 0; i < OCFS2_INODE_MAX_CACHE_ARRAY; i++) { tree[i] = kmem_cache_alloc(ocfs2_uptodate_cachep, - GFP_KERNEL); + GFP_NOFS); if (!tree[i]) { mlog_errno(-ENOMEM); goto out_free; diff --git a/fs/ocfs2/vote.c b/fs/ocfs2/vote.c index 53049a20419..ee42765a855 100644 --- a/fs/ocfs2/vote.c +++ b/fs/ocfs2/vote.c @@ -586,7 +586,7 @@ static struct ocfs2_net_wait_ctxt *ocfs2_new_net_wait_ctxt(unsigned int response { struct ocfs2_net_wait_ctxt *w; - w = kcalloc(1, sizeof(*w), GFP_KERNEL); + w = kcalloc(1, sizeof(*w), GFP_NOFS); if (!w) { mlog_errno(-ENOMEM); goto bail; @@ -749,7 +749,7 @@ static struct ocfs2_vote_msg * ocfs2_new_vote_request(struct ocfs2_super *osb, BUG_ON(!ocfs2_is_valid_vote_request(type)); - request = kcalloc(1, sizeof(*request), GFP_KERNEL); + request = kcalloc(1, sizeof(*request), GFP_NOFS); if (!request) { mlog_errno(-ENOMEM); } else { @@ -1129,7 +1129,7 @@ static int ocfs2_handle_vote_message(struct o2net_msg *msg, struct ocfs2_super *osb = data; struct ocfs2_vote_work *work; - work = kmalloc(sizeof(struct ocfs2_vote_work), GFP_KERNEL); + work = kmalloc(sizeof(struct ocfs2_vote_work), GFP_NOFS); if (!work) { status = -ENOMEM; mlog_errno(status); |