From 8eb2d829ffea3677c21bd038f19e5d8ca6b43e36 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Tue, 9 Nov 2010 14:48:01 +0800 Subject: btrfs: Fix threshold calculation for block groups smaller than 1GB If a block group is smaller than 1GB, the extent entry threadhold calculation will always set the threshold to 0. So as free space gets fragmented, btrfs will switch to use bitmap to manage free space, but then will never switch back to extents due to this bug. Reviewed-by: Josef Bacik Signed-off-by: Li Zefan diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index 60d6842..42f4015 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -1016,14 +1016,18 @@ static void recalculate_thresholds(struct btrfs_block_group_cache *block_group) u64 max_bytes; u64 bitmap_bytes; u64 extent_bytes; + u64 size = block_group->key.offset; /* * The goal is to keep the total amount of memory used per 1gb of space * at or below 32k, so we need to adjust how much memory we allow to be * used by extent based free space tracking */ - max_bytes = MAX_CACHE_BYTES_PER_GIG * - (div64_u64(block_group->key.offset, 1024 * 1024 * 1024)); + if (size < 1024 * 1024 * 1024) + max_bytes = MAX_CACHE_BYTES_PER_GIG; + else + max_bytes = MAX_CACHE_BYTES_PER_GIG * + div64_u64(size, 1024 * 1024 * 1024); /* * we want to account for 1 more bitmap than what we have so we can make -- cgit v0.10.2 From edf6e2d1ddbac7f326b34a27adbca71ece53ccce Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Tue, 9 Nov 2010 14:50:07 +0800 Subject: btrfs: Add helper function free_bitmap() Remove some duplicated code. This prepares for the next patch. Reviewed-by: Josef Bacik Signed-off-by: Li Zefan diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index 42f4015..850104f 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -1175,6 +1175,16 @@ static void add_new_bitmap(struct btrfs_block_group_cache *block_group, recalculate_thresholds(block_group); } +static void free_bitmap(struct btrfs_block_group_cache *block_group, + struct btrfs_free_space *bitmap_info) +{ + unlink_free_space(block_group, bitmap_info); + kfree(bitmap_info->bitmap); + kfree(bitmap_info); + block_group->total_bitmaps--; + recalculate_thresholds(block_group); +} + static noinline int remove_from_bitmap(struct btrfs_block_group_cache *block_group, struct btrfs_free_space *bitmap_info, u64 *offset, u64 *bytes) @@ -1215,13 +1225,8 @@ again: if (*bytes) { struct rb_node *next = rb_next(&bitmap_info->offset_index); - if (!bitmap_info->bytes) { - unlink_free_space(block_group, bitmap_info); - kfree(bitmap_info->bitmap); - kfree(bitmap_info); - block_group->total_bitmaps--; - recalculate_thresholds(block_group); - } + if (!bitmap_info->bytes) + free_bitmap(block_group, bitmap_info); /* * no entry after this bitmap, but we still have bytes to @@ -1254,13 +1259,8 @@ again: return -EAGAIN; goto again; - } else if (!bitmap_info->bytes) { - unlink_free_space(block_group, bitmap_info); - kfree(bitmap_info->bitmap); - kfree(bitmap_info); - block_group->total_bitmaps--; - recalculate_thresholds(block_group); - } + } else if (!bitmap_info->bytes) + free_bitmap(block_group, bitmap_info); return 0; } @@ -1689,13 +1689,8 @@ u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group, ret = offset; if (entry->bitmap) { bitmap_clear_bits(block_group, entry, offset, bytes); - if (!entry->bytes) { - unlink_free_space(block_group, entry); - kfree(entry->bitmap); - kfree(entry); - block_group->total_bitmaps--; - recalculate_thresholds(block_group); - } + if (!entry->bytes) + free_bitmap(block_group, entry); } else { unlink_free_space(block_group, entry); entry->offset += bytes; -- cgit v0.10.2 From 70b7da304f9f9bbf1566085155895e32e775a745 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Tue, 9 Nov 2010 14:51:45 +0800 Subject: btrfs: Free fully occupied bitmap in cluster If there's no more free space in a bitmap, we should free it. Reviewed-by: Josef Bacik Signed-off-by: Li Zefan diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index 850104f..cb0137e 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -1788,6 +1788,8 @@ static u64 btrfs_alloc_from_bitmap(struct btrfs_block_group_cache *block_group, ret = search_start; bitmap_clear_bits(block_group, entry, ret, bytes); + if (entry->bytes == 0) + free_bitmap(block_group, entry); out: spin_unlock(&cluster->lock); spin_unlock(&block_group->tree_lock); -- cgit v0.10.2 From 5e71b5d5ec07e4b3fb4c78c4e4b108ff667f123f Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Tue, 9 Nov 2010 14:55:34 +0800 Subject: btrfs: Update stats when allocating from a cluster When allocating extent entry from a cluster, we should update the free_space and free_extents fields of the block group. Reviewed-by: Josef Bacik Signed-off-by: Li Zefan diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index cb0137e..2974c47 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -1843,15 +1843,26 @@ u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group, entry->offset += bytes; entry->bytes -= bytes; - if (entry->bytes == 0) { + if (entry->bytes == 0) rb_erase(&entry->offset_index, &cluster->root); - kfree(entry); - } break; } out: spin_unlock(&cluster->lock); + if (!ret) + return 0; + + spin_lock(&block_group->tree_lock); + + block_group->free_space -= bytes; + if (entry->bytes == 0) { + block_group->free_extents--; + kfree(entry); + } + + spin_unlock(&block_group->tree_lock); + return ret; } -- cgit v0.10.2 From 120d66eec0dcb966fbd03f743598b2ff2513436b Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Tue, 9 Nov 2010 14:56:50 +0800 Subject: btrfs: Add a helper try_merge_free_space() When adding a new extent, we'll firstly see if we can merge this extent to the left or/and right extent. Extract this as a helper try_merge_free_space(). As a side effect, we fix a small bug that if the new extent has non-bitmap left entry but is unmergeble, we'll directly link the extent without trying to drop it into bitmap. This also prepares for the next patch. Reviewed-by: Josef Bacik Signed-off-by: Li Zefan diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index 2974c47..cf67dc3 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -1363,22 +1363,14 @@ out: return ret; } -int btrfs_add_free_space(struct btrfs_block_group_cache *block_group, - u64 offset, u64 bytes) +bool try_merge_free_space(struct btrfs_block_group_cache *block_group, + struct btrfs_free_space *info) { - struct btrfs_free_space *right_info = NULL; - struct btrfs_free_space *left_info = NULL; - struct btrfs_free_space *info = NULL; - int ret = 0; - - info = kzalloc(sizeof(struct btrfs_free_space), GFP_NOFS); - if (!info) - return -ENOMEM; - - info->offset = offset; - info->bytes = bytes; - - spin_lock(&block_group->tree_lock); + struct btrfs_free_space *left_info; + struct btrfs_free_space *right_info; + bool merged = false; + u64 offset = info->offset; + u64 bytes = info->bytes; /* * first we want to see if there is free space adjacent to the range we @@ -1392,27 +1384,11 @@ int btrfs_add_free_space(struct btrfs_block_group_cache *block_group, else left_info = tree_search_offset(block_group, offset - 1, 0, 0); - /* - * If there was no extent directly to the left or right of this new - * extent then we know we're going to have to allocate a new extent, so - * before we do that see if we need to drop this into a bitmap - */ - if ((!left_info || left_info->bitmap) && - (!right_info || right_info->bitmap)) { - ret = insert_into_bitmap(block_group, info); - - if (ret < 0) { - goto out; - } else if (ret) { - ret = 0; - goto out; - } - } - if (right_info && !right_info->bitmap) { unlink_free_space(block_group, right_info); info->bytes += right_info->bytes; kfree(right_info); + merged = true; } if (left_info && !left_info->bitmap && @@ -1421,8 +1397,43 @@ int btrfs_add_free_space(struct btrfs_block_group_cache *block_group, info->offset = left_info->offset; info->bytes += left_info->bytes; kfree(left_info); + merged = true; } + return merged; +} + +int btrfs_add_free_space(struct btrfs_block_group_cache *block_group, + u64 offset, u64 bytes) +{ + struct btrfs_free_space *info; + int ret = 0; + + info = kzalloc(sizeof(struct btrfs_free_space), GFP_NOFS); + if (!info) + return -ENOMEM; + + info->offset = offset; + info->bytes = bytes; + + spin_lock(&block_group->tree_lock); + + if (try_merge_free_space(block_group, info)) + goto link; + + /* + * There was no extent directly to the left or right of this new + * extent then we know we're going to have to allocate a new extent, so + * before we do that see if we need to drop this into a bitmap + */ + ret = insert_into_bitmap(block_group, info); + if (ret < 0) { + goto out; + } else if (ret) { + ret = 0; + goto out; + } +link: ret = link_free_space(block_group, info); if (ret) kfree(info); -- cgit v0.10.2 From f333adb5d64bc1c4d6099072fc341c3c8f84e0cf Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Tue, 9 Nov 2010 14:57:39 +0800 Subject: btrfs: Check mergeable free space when removing a cluster After returing extents from a cluster to the block group, some extents in the block group may be mergeable. Reviewed-by: Josef Bacik Signed-off-by: Li Zefan diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index cf67dc3..a5501ed 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -987,11 +987,18 @@ tree_search_offset(struct btrfs_block_group_cache *block_group, return entry; } -static void unlink_free_space(struct btrfs_block_group_cache *block_group, - struct btrfs_free_space *info) +static inline void +__unlink_free_space(struct btrfs_block_group_cache *block_group, + struct btrfs_free_space *info) { rb_erase(&info->offset_index, &block_group->free_space_offset); block_group->free_extents--; +} + +static void unlink_free_space(struct btrfs_block_group_cache *block_group, + struct btrfs_free_space *info) +{ + __unlink_free_space(block_group, info); block_group->free_space -= info->bytes; } @@ -1364,7 +1371,7 @@ out: } bool try_merge_free_space(struct btrfs_block_group_cache *block_group, - struct btrfs_free_space *info) + struct btrfs_free_space *info, bool update_stat) { struct btrfs_free_space *left_info; struct btrfs_free_space *right_info; @@ -1385,7 +1392,10 @@ bool try_merge_free_space(struct btrfs_block_group_cache *block_group, left_info = tree_search_offset(block_group, offset - 1, 0, 0); if (right_info && !right_info->bitmap) { - unlink_free_space(block_group, right_info); + if (update_stat) + unlink_free_space(block_group, right_info); + else + __unlink_free_space(block_group, right_info); info->bytes += right_info->bytes; kfree(right_info); merged = true; @@ -1393,7 +1403,10 @@ bool try_merge_free_space(struct btrfs_block_group_cache *block_group, if (left_info && !left_info->bitmap && left_info->offset + left_info->bytes == offset) { - unlink_free_space(block_group, left_info); + if (update_stat) + unlink_free_space(block_group, left_info); + else + __unlink_free_space(block_group, left_info); info->offset = left_info->offset; info->bytes += left_info->bytes; kfree(left_info); @@ -1418,7 +1431,7 @@ int btrfs_add_free_space(struct btrfs_block_group_cache *block_group, spin_lock(&block_group->tree_lock); - if (try_merge_free_space(block_group, info)) + if (try_merge_free_space(block_group, info, true)) goto link; /* @@ -1636,6 +1649,7 @@ __btrfs_return_cluster_to_free_space( node = rb_next(&entry->offset_index); rb_erase(&entry->offset_index, &cluster->root); BUG_ON(entry->bitmap); + try_merge_free_space(block_group, entry, false); tree_insert_offset(&block_group->free_space_offset, entry->offset, &entry->offset_index, 0); } -- cgit v0.10.2 From 83a4d54840c88a4a45c49670f044b8c7ddeaa8c7 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Mon, 27 Dec 2010 16:19:53 +0800 Subject: Btrfs: Fix memory leak at umount fs_info, which is allocated in open_ctree(), should be freed in close_ctree(). Signed-off-by: Li Zefan diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index a5d2249..089871e 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -2513,6 +2513,8 @@ int close_ctree(struct btrfs_root *root) kfree(fs_info->chunk_root); kfree(fs_info->dev_root); kfree(fs_info->csum_root); + kfree(fs_info); + return 0; } -- cgit v0.10.2 From bdc924bb4cdac92b945945c3149ab8191c92d75d Mon Sep 17 00:00:00 2001 From: Ian Kent Date: Mon, 27 Dec 2010 16:33:15 +0800 Subject: Btrfs: Fix memory leak on finding existing super We missed a memory deallocation in commit 450ba0ea. If an existing super block is found at mount and there is no error condition then the pre-allocated tree_root and fs_info are no not used and are not freeded. Signed-off-by: Ian Kent Signed-off-by: Li Zefan diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 61bd79a..f50253c 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -654,6 +654,8 @@ static int btrfs_get_sb(struct file_system_type *fs_type, int flags, } btrfs_close_devices(fs_devices); + kfree(fs_info); + kfree(tree_root); } else { char b[BDEVNAME_SIZE]; -- cgit v0.10.2 From 3f3d0bc0df041236fad4ffa82188a6e4ef9af75e Mon Sep 17 00:00:00 2001 From: Tero Roponen Date: Mon, 27 Dec 2010 16:43:13 +0800 Subject: Btrfs: Free correct pointer after using strsep We must save and free the original kstrdup()'ed pointer because strsep() modifies its first argument. Signed-off-by: Tero Roponen Signed-off-by: Li Zefan diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index f50253c..78ee681 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -277,7 +277,7 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags, struct btrfs_fs_devices **fs_devices) { substring_t args[MAX_OPT_ARGS]; - char *opts, *p; + char *opts, *orig, *p; int error = 0; int intarg; @@ -291,6 +291,7 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags, opts = kstrdup(options, GFP_KERNEL); if (!opts) return -ENOMEM; + orig = opts; while ((p = strsep(&opts, ",")) != NULL) { int token; @@ -326,7 +327,7 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags, } out_free_opts: - kfree(opts); + kfree(orig); out: /* * If no subvolume name is specified we use the default one. Allocate -- cgit v0.10.2 From d0f69686c2ae775529aadc7a8acc6f13ad41de66 Mon Sep 17 00:00:00 2001 From: Miao Xie Date: Tue, 25 Jan 2011 15:46:17 +0800 Subject: Btrfs: Don't return acl info when mounting with noacl option Steps to reproduce: # mkfs.btrfs /dev/sda2 # mount /dev/sda2 /mnt # touch /mnt/file0 # setfacl -m 'u:root:x,g::x,o::x' /mnt/file0 # umount /mnt # mount /dev/sda2 -o noacl /mnt # getfacl /mnt/file0 ... user::rw- user:root:--x group::--x mask::--x other::--x The output should be: user::rw- group::--x other::--x Signed-off-by: Miao Xie Signed-off-by: Li Zefan diff --git a/fs/btrfs/acl.c b/fs/btrfs/acl.c index 2222d16..3c52fc8 100644 --- a/fs/btrfs/acl.c +++ b/fs/btrfs/acl.c @@ -37,6 +37,9 @@ static struct posix_acl *btrfs_get_acl(struct inode *inode, int type) char *value = NULL; struct posix_acl *acl; + if (!IS_POSIXACL(inode)) + return NULL; + acl = get_cached_acl(inode, type); if (acl != ACL_NOT_CACHED) return acl; @@ -82,6 +85,9 @@ static int btrfs_xattr_acl_get(struct dentry *dentry, const char *name, struct posix_acl *acl; int ret = 0; + if (!IS_POSIXACL(dentry->d_inode)) + return -EOPNOTSUPP; + acl = btrfs_get_acl(dentry->d_inode, type); if (IS_ERR(acl)) -- cgit v0.10.2 From b897abec032deb7cc3ce67392a1f544ac965ddea Mon Sep 17 00:00:00 2001 From: Miao Xie Date: Wed, 26 Jan 2011 16:19:22 +0800 Subject: Btrfs: Fix memory leak in writepage fixup work fixup, which is allocated when starting page write to fix up the extent without ORDERED bit set, should be freed after this work is done. Signed-off-by: Miao Xie Signed-off-by: Li Zefan diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 5f91944..3a6edc4 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -1544,6 +1544,7 @@ out: out_page: unlock_page(page); page_cache_release(page); + kfree(fixup); } /* -- cgit v0.10.2 From 4d728ec7aefdca5419d2ebfb28c147e81a4b59f4 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Wed, 26 Jan 2011 14:10:43 +0800 Subject: Btrfs: Fix file clone when source offset is not 0 Suppose: - the source extent is: [0, 100] - the src offset is 10 - the clone length is 90 - the dest offset is 0 This statement: new_key.offset = key.offset + destoff - off will produce such an extent for the dest file: [ino, BTRFS_EXTENT_DATA_KEY, -10] , which is obviously wrong. Signed-off-by: Li Zefan diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index f87552a..1b61dab 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -1788,7 +1788,10 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, memcpy(&new_key, &key, sizeof(new_key)); new_key.objectid = inode->i_ino; - new_key.offset = key.offset + destoff - off; + if (off <= key.offset) + new_key.offset = key.offset + destoff - off; + else + new_key.offset = destoff; trans = btrfs_start_transaction(root, 1); if (IS_ERR(trans)) { -- cgit v0.10.2 From 6b82ce8d824bd46053e46a895876cde39d9026e4 Mon Sep 17 00:00:00 2001 From: liubo Date: Wed, 26 Jan 2011 06:21:39 +0000 Subject: btrfs: fix uncheck memory allocation in btrfs_submit_compressed_read btrfs_submit_compressed_read() is lack of memory allocation checks and corresponding error route. After this fix, if it comes to "no memory" case, errno will be returned to userland step by step, and tell users this operation cannot go on. Signed-off-by: Liu Bo Signed-off-by: Chris Mason diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c index f745287..3a932f1 100644 --- a/fs/btrfs/compression.c +++ b/fs/btrfs/compression.c @@ -562,7 +562,7 @@ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, u64 em_len; u64 em_start; struct extent_map *em; - int ret; + int ret = -ENOMEM; u32 *sums; tree = &BTRFS_I(inode)->io_tree; @@ -577,6 +577,9 @@ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, compressed_len = em->block_len; cb = kmalloc(compressed_bio_size(root, compressed_len), GFP_NOFS); + if (!cb) + goto out; + atomic_set(&cb->pending_bios, 0); cb->errors = 0; cb->inode = inode; @@ -597,13 +600,18 @@ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, nr_pages = (compressed_len + PAGE_CACHE_SIZE - 1) / PAGE_CACHE_SIZE; - cb->compressed_pages = kmalloc(sizeof(struct page *) * nr_pages, + cb->compressed_pages = kzalloc(sizeof(struct page *) * nr_pages, GFP_NOFS); + if (!cb->compressed_pages) + goto fail1; + bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; for (page_index = 0; page_index < nr_pages; page_index++) { cb->compressed_pages[page_index] = alloc_page(GFP_NOFS | __GFP_HIGHMEM); + if (!cb->compressed_pages[page_index]) + goto fail2; } cb->nr_pages = nr_pages; @@ -614,6 +622,8 @@ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, cb->len = uncompressed_len; comp_bio = compressed_bio_alloc(bdev, cur_disk_byte, GFP_NOFS); + if (!comp_bio) + goto fail2; comp_bio->bi_private = cb; comp_bio->bi_end_io = end_compressed_bio_read; atomic_inc(&cb->pending_bios); @@ -681,6 +691,17 @@ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, bio_put(comp_bio); return 0; + +fail2: + for (page_index = 0; page_index < nr_pages; page_index++) + free_page((unsigned long)cb->compressed_pages[page_index]); + + kfree(cb->compressed_pages); +fail1: + kfree(cb); +out: + free_extent_map(em); + return ret; } static struct list_head comp_idle_workspace[BTRFS_COMPRESS_TYPES]; diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 8b8d3d9..6411ed6 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -1865,7 +1865,7 @@ static int submit_one_bio(int rw, struct bio *bio, int mirror_num, bio_get(bio); if (tree->ops && tree->ops->submit_bio_hook) - tree->ops->submit_bio_hook(page->mapping->host, rw, bio, + ret = tree->ops->submit_bio_hook(page->mapping->host, rw, bio, mirror_num, bio_flags, start); else submit_bio(rw, bio); @@ -2126,7 +2126,7 @@ int extent_read_full_page(struct extent_io_tree *tree, struct page *page, ret = __extent_read_full_page(tree, page, get_extent, &bio, 0, &bio_flags); if (bio) - submit_one_bio(READ, bio, 0, bio_flags); + ret = submit_one_bio(READ, bio, 0, bio_flags); return ret; } -- cgit v0.10.2 From 2a29edc6b60a5248ccab588e7ba7dad38cef0235 Mon Sep 17 00:00:00 2001 From: liubo Date: Wed, 26 Jan 2011 06:22:08 +0000 Subject: btrfs: fix several uncheck memory allocations To make btrfs more stable, add several missing necessary memory allocation checks, and when no memory, return proper errno. We've checked that some of those -ENOMEM errors will be returned to userspace, and some will be catched by BUG_ON() in the upper callers, and none will be ignored silently. Signed-off-by: Liu Bo Signed-off-by: Chris Mason diff --git a/fs/btrfs/export.c b/fs/btrfs/export.c index 6f04444..3220ad1 100644 --- a/fs/btrfs/export.c +++ b/fs/btrfs/export.c @@ -176,6 +176,8 @@ static struct dentry *btrfs_get_parent(struct dentry *child) int ret; path = btrfs_alloc_path(); + if (!path) + return ERR_PTR(-ENOMEM); if (dir->i_ino == BTRFS_FIRST_FREE_OBJECTID) { key.objectid = root->root_key.objectid; diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c index a562a25..d0bc726 100644 --- a/fs/btrfs/file-item.c +++ b/fs/btrfs/file-item.c @@ -536,6 +536,8 @@ int btrfs_del_csums(struct btrfs_trans_handle *trans, root = root->fs_info->csum_root; path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; while (1) { key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index f903433..65b2424 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -945,6 +945,10 @@ static ssize_t btrfs_file_aio_write(struct kiocb *iocb, PAGE_CACHE_SIZE, PAGE_CACHE_SIZE / (sizeof(struct page *))); pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL); + if (!pages) { + ret = -ENOMEM; + goto out; + } /* generic_write_checks can change our pos */ start_pos = pos; diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c index 054744a..c25a41d 100644 --- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -338,6 +338,12 @@ static noinline int overwrite_item(struct btrfs_trans_handle *trans, } dst_copy = kmalloc(item_size, GFP_NOFS); src_copy = kmalloc(item_size, GFP_NOFS); + if (!dst_copy || !src_copy) { + btrfs_release_path(root, path); + kfree(dst_copy); + kfree(src_copy); + return -ENOMEM; + } read_extent_buffer(eb, src_copy, src_ptr, item_size); @@ -665,6 +671,9 @@ static noinline int drop_one_dir_item(struct btrfs_trans_handle *trans, btrfs_dir_item_key_to_cpu(leaf, di, &location); name_len = btrfs_dir_name_len(leaf, di); name = kmalloc(name_len, GFP_NOFS); + if (!name) + return -ENOMEM; + read_extent_buffer(leaf, name, (unsigned long)(di + 1), name_len); btrfs_release_path(root, path); @@ -744,6 +753,9 @@ static noinline int backref_in_log(struct btrfs_root *log, int match = 0; path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + ret = btrfs_search_slot(NULL, log, key, path, 0, 0); if (ret != 0) goto out; @@ -967,6 +979,8 @@ static noinline int fixup_inode_link_count(struct btrfs_trans_handle *trans, key.offset = (u64)-1; path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; while (1) { ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); @@ -1178,6 +1192,9 @@ static noinline int replay_one_name(struct btrfs_trans_handle *trans, name_len = btrfs_dir_name_len(eb, di); name = kmalloc(name_len, GFP_NOFS); + if (!name) + return -ENOMEM; + log_type = btrfs_dir_type(eb, di); read_extent_buffer(eb, name, (unsigned long)(di + 1), name_len); @@ -1692,6 +1709,8 @@ static noinline int walk_down_log_tree(struct btrfs_trans_handle *trans, root_owner = btrfs_header_owner(parent); next = btrfs_find_create_tree_block(root, bytenr, blocksize); + if (!next) + return -ENOMEM; if (*level == 1) { wc->process_func(root, next, wc, ptr_gen); @@ -2194,6 +2213,9 @@ int btrfs_del_dir_entries_in_log(struct btrfs_trans_handle *trans, log = root->log_root; path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + di = btrfs_lookup_dir_item(trans, log, path, dir->i_ino, name, name_len, -1); if (IS_ERR(di)) { @@ -2594,6 +2616,9 @@ static noinline int copy_items(struct btrfs_trans_handle *trans, ins_data = kmalloc(nr * sizeof(struct btrfs_key) + nr * sizeof(u32), GFP_NOFS); + if (!ins_data) + return -ENOMEM; + ins_sizes = (u32 *)ins_data; ins_keys = (struct btrfs_key *)(ins_data + nr * sizeof(u32)); -- cgit v0.10.2 From 333e8105445d4f51101fc3d23199a919d66730b3 Mon Sep 17 00:00:00 2001 From: liubo Date: Wed, 26 Jan 2011 06:22:33 +0000 Subject: btrfs: fix missing break in switch phrase There is a missing break in switch, fix it. Signed-off-by: Liu Bo Signed-off-by: Chris Mason diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c index 0d126be..fb2605d 100644 --- a/fs/btrfs/print-tree.c +++ b/fs/btrfs/print-tree.c @@ -260,6 +260,7 @@ void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l) #else BUG(); #endif + break; case BTRFS_BLOCK_GROUP_ITEM_KEY: bi = btrfs_item_ptr(l, i, struct btrfs_block_group_item); -- cgit v0.10.2 From 34d19bada00f4825588b338a8ee193820f9ceeb0 Mon Sep 17 00:00:00 2001 From: Julia Lawall Date: Mon, 24 Jan 2011 19:55:19 +0000 Subject: fs/btrfs/inode.c: Add missing IS_ERR test After the conditional that precedes the following code, inode may be an ERR_PTR value. This can eg result from a memory allocation failure via the call to btrfs_iget, and thus does not imply that root is different than sub_root. Thus, an IS_ERR check is added to ensure that there is no dereference of inode in this case. The semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // @r@ identifier f; @@ f(...) { ... return ERR_PTR(...); } @@ identifier r.f, fld; expression x; statement S1,S2; @@ x = f(...) ... when != IS_ERR(x) ( if (IS_ERR(x) ||...) S1 else S2 | *x->fld ) // Signed-off-by: Julia Lawall Signed-off-by: Chris Mason diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 2c9a2f7..2b7d251 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -4137,7 +4137,7 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry) } srcu_read_unlock(&root->fs_info->subvol_srcu, index); - if (root != sub_root) { + if (!IS_ERR(inode) && root != sub_root) { down_read(&root->fs_info->cleanup_work_sem); if (!(inode->i_sb->s_flags & MS_RDONLY)) btrfs_orphan_cleanup(sub_root); -- cgit v0.10.2 From 3612b49598c303cfb22a4b609427f829828e2427 Mon Sep 17 00:00:00 2001 From: Tsutomu Itoh Date: Tue, 25 Jan 2011 02:51:38 +0000 Subject: btrfs: fix return value check of btrfs_join_transaction() The error check of btrfs_join_transaction()/btrfs_join_transaction_nolock() is added, and the mistake of the error check in several places is corrected. For more stable Btrfs, I think that we should reduce BUG_ON(). But, I think that long time is necessary for this. So, I propose this patch as a short-term solution. With this patch: - To more stable Btrfs, the part that should be corrected is clarified. - The panic isn't done by the NULL pointer reference etc. (even if BUG_ON() is increased temporarily) - The error code is returned in the place where the error can be easily returned. As a long-term plan: - BUG_ON() is reduced by using the forced-readonly framework, etc. Signed-off-by: Tsutomu Itoh Signed-off-by: Chris Mason diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 2887b8b..b36eeef 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -1550,6 +1550,7 @@ static int transaction_kthread(void *arg) spin_unlock(&root->fs_info->new_trans_lock); trans = btrfs_join_transaction(root, 1); + BUG_ON(IS_ERR(trans)); if (transid == trans->transid) { ret = btrfs_commit_transaction(trans, root); BUG_ON(ret); @@ -2464,10 +2465,14 @@ int btrfs_commit_super(struct btrfs_root *root) up_write(&root->fs_info->cleanup_work_sem); trans = btrfs_join_transaction(root, 1); + if (IS_ERR(trans)) + return PTR_ERR(trans); ret = btrfs_commit_transaction(trans, root); BUG_ON(ret); /* run commit again to drop the original snapshot */ trans = btrfs_join_transaction(root, 1); + if (IS_ERR(trans)) + return PTR_ERR(trans); btrfs_commit_transaction(trans, root); ret = btrfs_write_and_wait_transaction(NULL, root); BUG_ON(ret); diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index bcf3032..98ee139 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -7478,7 +7478,7 @@ int btrfs_drop_dead_reloc_roots(struct btrfs_root *root) BUG_ON(reloc_root->commit_root != NULL); while (1) { trans = btrfs_join_transaction(root, 1); - BUG_ON(!trans); + BUG_ON(IS_ERR(trans)); mutex_lock(&root->fs_info->drop_mutex); ret = btrfs_drop_snapshot(trans, reloc_root); diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 2b7d251..40fee13 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -416,7 +416,7 @@ again: } if (start == 0) { trans = btrfs_join_transaction(root, 1); - BUG_ON(!trans); + BUG_ON(IS_ERR(trans)); btrfs_set_trans_block_group(trans, inode); trans->block_rsv = &root->fs_info->delalloc_block_rsv; @@ -612,6 +612,7 @@ retry: GFP_NOFS); trans = btrfs_join_transaction(root, 1); + BUG_ON(IS_ERR(trans)); ret = btrfs_reserve_extent(trans, root, async_extent->compressed_size, async_extent->compressed_size, @@ -771,7 +772,7 @@ static noinline int cow_file_range(struct inode *inode, BUG_ON(root == root->fs_info->tree_root); trans = btrfs_join_transaction(root, 1); - BUG_ON(!trans); + BUG_ON(IS_ERR(trans)); btrfs_set_trans_block_group(trans, inode); trans->block_rsv = &root->fs_info->delalloc_block_rsv; @@ -1049,7 +1050,7 @@ static noinline int run_delalloc_nocow(struct inode *inode, } else { trans = btrfs_join_transaction(root, 1); } - BUG_ON(!trans); + BUG_ON(IS_ERR(trans)); cow_start = (u64)-1; cur_offset = start; @@ -1704,7 +1705,7 @@ static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end) trans = btrfs_join_transaction_nolock(root, 1); else trans = btrfs_join_transaction(root, 1); - BUG_ON(!trans); + BUG_ON(IS_ERR(trans)); btrfs_set_trans_block_group(trans, inode); trans->block_rsv = &root->fs_info->delalloc_block_rsv; ret = btrfs_update_inode(trans, root, inode); @@ -1721,6 +1722,7 @@ static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end) trans = btrfs_join_transaction_nolock(root, 1); else trans = btrfs_join_transaction(root, 1); + BUG_ON(IS_ERR(trans)); btrfs_set_trans_block_group(trans, inode); trans->block_rsv = &root->fs_info->delalloc_block_rsv; @@ -2382,6 +2384,7 @@ void btrfs_orphan_cleanup(struct btrfs_root *root) if (root->orphan_block_rsv || root->orphan_item_inserted) { trans = btrfs_join_transaction(root, 1); + BUG_ON(IS_ERR(trans)); btrfs_end_transaction(trans, root); } @@ -4350,6 +4353,8 @@ int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc) trans = btrfs_join_transaction_nolock(root, 1); else trans = btrfs_join_transaction(root, 1); + if (IS_ERR(trans)) + return PTR_ERR(trans); btrfs_set_trans_block_group(trans, inode); if (nolock) ret = btrfs_end_transaction_nolock(trans, root); @@ -4375,6 +4380,7 @@ void btrfs_dirty_inode(struct inode *inode) return; trans = btrfs_join_transaction(root, 1); + BUG_ON(IS_ERR(trans)); btrfs_set_trans_block_group(trans, inode); ret = btrfs_update_inode(trans, root, inode); @@ -5179,6 +5185,8 @@ again: em = NULL; btrfs_release_path(root, path); trans = btrfs_join_transaction(root, 1); + if (IS_ERR(trans)) + return ERR_CAST(trans); goto again; } map = kmap(page); @@ -5283,8 +5291,8 @@ static struct extent_map *btrfs_new_extent_direct(struct inode *inode, btrfs_drop_extent_cache(inode, start, start + len - 1, 0); trans = btrfs_join_transaction(root, 0); - if (!trans) - return ERR_PTR(-ENOMEM); + if (IS_ERR(trans)) + return ERR_CAST(trans); trans->block_rsv = &root->fs_info->delalloc_block_rsv; @@ -5508,7 +5516,7 @@ static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock, * while we look for nocow cross refs */ trans = btrfs_join_transaction(root, 0); - if (!trans) + if (IS_ERR(trans)) goto must_cow; if (can_nocow_odirect(trans, inode, start, len) == 1) { @@ -5643,7 +5651,7 @@ again: BUG_ON(!ordered); trans = btrfs_join_transaction(root, 1); - if (!trans) { + if (IS_ERR(trans)) { err = -ENOMEM; goto out; } diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index edd82be..04b4fb9 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -203,7 +203,7 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg) trans = btrfs_join_transaction(root, 1); - BUG_ON(!trans); + BUG_ON(IS_ERR(trans)); ret = btrfs_update_inode(trans, root, inode); BUG_ON(ret); diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c index 045c9c2..ea99654 100644 --- a/fs/btrfs/relocation.c +++ b/fs/btrfs/relocation.c @@ -2147,6 +2147,12 @@ again: } trans = btrfs_join_transaction(rc->extent_root, 1); + if (IS_ERR(trans)) { + if (!err) + btrfs_block_rsv_release(rc->extent_root, + rc->block_rsv, num_bytes); + return PTR_ERR(trans); + } if (!err) { if (num_bytes != rc->merging_rsv_size) { @@ -3222,6 +3228,7 @@ truncate: trans = btrfs_join_transaction(root, 0); if (IS_ERR(trans)) { btrfs_free_path(path); + ret = PTR_ERR(trans); goto out; } @@ -3628,6 +3635,7 @@ int prepare_to_relocate(struct reloc_control *rc) set_reloc_control(rc); trans = btrfs_join_transaction(rc->extent_root, 1); + BUG_ON(IS_ERR(trans)); btrfs_commit_transaction(trans, rc->extent_root); return 0; } @@ -3804,7 +3812,10 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc) /* get rid of pinned extents */ trans = btrfs_join_transaction(rc->extent_root, 1); - btrfs_commit_transaction(trans, rc->extent_root); + if (IS_ERR(trans)) + err = PTR_ERR(trans); + else + btrfs_commit_transaction(trans, rc->extent_root); out_free: btrfs_free_block_rsv(rc->extent_root, rc->block_rsv); btrfs_free_path(path); @@ -4125,6 +4136,11 @@ int btrfs_recover_relocation(struct btrfs_root *root) set_reloc_control(rc); trans = btrfs_join_transaction(rc->extent_root, 1); + if (IS_ERR(trans)) { + unset_reloc_control(rc); + err = PTR_ERR(trans); + goto out_free; + } rc->merge_reloc_tree = 1; @@ -4154,9 +4170,13 @@ int btrfs_recover_relocation(struct btrfs_root *root) unset_reloc_control(rc); trans = btrfs_join_transaction(rc->extent_root, 1); - btrfs_commit_transaction(trans, rc->extent_root); -out: + if (IS_ERR(trans)) + err = PTR_ERR(trans); + else + btrfs_commit_transaction(trans, rc->extent_root); +out_free: kfree(rc); +out: while (!list_empty(&reloc_roots)) { reloc_root = list_entry(reloc_roots.next, struct btrfs_root, root_list); diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index bae5c7b..3d73c8d 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -1161,6 +1161,11 @@ int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans, INIT_DELAYED_WORK(&ac->work, do_async_commit); ac->root = root; ac->newtrans = btrfs_join_transaction(root, 0); + if (IS_ERR(ac->newtrans)) { + int err = PTR_ERR(ac->newtrans); + kfree(ac); + return err; + } /* take transaction reference */ mutex_lock(&root->fs_info->trans_mutex); -- cgit v0.10.2 From abd30bb0af9d4671506502278e8631bed9e3c35c Mon Sep 17 00:00:00 2001 From: Tsutomu Itoh Date: Mon, 24 Jan 2011 00:57:10 +0000 Subject: btrfs: check return value of btrfs_start_ioctl_transaction() properly btrfs_start_ioctl_transaction() returns ERR_PTR(), not NULL. So, it is necessary to use IS_ERR() to check the return value. Signed-off-by: Tsutomu Itoh Signed-off-by: Chris Mason diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 04b4fb9..12dabe2 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -2085,7 +2085,7 @@ static long btrfs_ioctl_trans_start(struct file *file) ret = -ENOMEM; trans = btrfs_start_ioctl_transaction(root, 0); - if (!trans) + if (IS_ERR(trans)) goto out_drop; file->private_data = trans; -- cgit v0.10.2 From dedefd7215d3ec451291ca393e5c8e4c1882c8c6 Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Mon, 24 Jan 2011 21:43:18 +0000 Subject: Btrfs: fix check_path_shared so it returns the right value When running xfstests 224 I kept getting ENOSPC when trying to remove the files, and this is because we were returning ret from check_path_shared while it was uninitalized, which isn't right. Fix this to return 0 properly, and now xfstests 224 doesn't freak out when it tries to clean itself up. Thanks, Signed-off-by: Josef Bacik Signed-off-by: Chris Mason diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 40fee13..5621818 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -2718,9 +2718,10 @@ static int check_path_shared(struct btrfs_root *root, struct extent_buffer *eb; int level; u64 refs = 1; - int uninitialized_var(ret); for (level = 0; level < BTRFS_MAX_LEVEL; level++) { + int ret; + if (!path->nodes[level]) break; eb = path->nodes[level]; @@ -2731,7 +2732,7 @@ static int check_path_shared(struct btrfs_root *root, if (refs > 1) return 1; } - return ret; /* XXX callers? */ + return 0; } /* -- cgit v0.10.2 From e9e22899de661af94cb9995885fd04e4c738838b Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Mon, 24 Jan 2011 21:43:19 +0000 Subject: Btrfs: do not release more reserved bytes to the global_block_rsv than we need When we do btrfs_block_rsv_release, if global_block_rsv is not full we will release all the extra bytes to global_block_rsv, even if it's only a little short of the amount of space that we need to reserve. This causes us to starve ourselves of reservable space during the transaction which will force us to shrink delalloc bytes and commit the transaction more often than we should. So instead just add the amount of bytes we need to add to the global reserve so reserved == size, and then add the rest back into the space_info for general use. Thanks, Signed-off-by: Josef Bacik Signed-off-by: Chris Mason diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 98ee139..7af618d 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -3589,8 +3589,20 @@ void block_rsv_release_bytes(struct btrfs_block_rsv *block_rsv, if (num_bytes > 0) { if (dest) { - block_rsv_add_bytes(dest, num_bytes, 0); - } else { + spin_lock(&dest->lock); + if (!dest->full) { + u64 bytes_to_add; + + bytes_to_add = dest->size - dest->reserved; + bytes_to_add = min(num_bytes, bytes_to_add); + dest->reserved += bytes_to_add; + if (dest->reserved >= dest->size) + dest->full = 1; + num_bytes -= bytes_to_add; + } + spin_unlock(&dest->lock); + } + if (num_bytes) { spin_lock(&space_info->lock); space_info->bytes_reserved -= num_bytes; spin_unlock(&space_info->lock); -- cgit v0.10.2 From 68a82277b8619e6d0f2738b1d9b160b627e81e92 Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Mon, 24 Jan 2011 21:43:20 +0000 Subject: Btrfs: use the global block reserve if we cannot reserve space We call use_block_rsv right before we make an allocation in order to make sure we have enough space. Now normally people have called btrfs_start_transaction() with the appropriate amount of space that we need, so we just use some of that pre-reserved space and move along happily. The problem is where people use btrfs_join_transaction(), which doesn't actually reserve any space. So we try and reserve space here, but we cannot flush delalloc, so this forces us to return -ENOSPC when in reality we have plenty of space. The most common symptom is seeing a bunch of "couldn't dirty inode" messages in syslog. With xfstests 224 we end up falling back to start_transaction and then doing all the flush delalloc stuff which causes to hang for a very long time. So instead steal from the global reserve, which is what this is meant for anyway. With this patch and the other 2 I have sent xfstests 224 now passes successfully. Thanks, Signed-off-by: Josef Bacik Signed-off-by: Chris Mason diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 7af618d..ff6bbfd 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -5646,6 +5646,7 @@ use_block_rsv(struct btrfs_trans_handle *trans, struct btrfs_root *root, u32 blocksize) { struct btrfs_block_rsv *block_rsv; + struct btrfs_block_rsv *global_rsv = &root->fs_info->global_block_rsv; int ret; block_rsv = get_block_rsv(trans, root); @@ -5653,14 +5654,39 @@ use_block_rsv(struct btrfs_trans_handle *trans, if (block_rsv->size == 0) { ret = reserve_metadata_bytes(trans, root, block_rsv, blocksize, 0); - if (ret) + /* + * If we couldn't reserve metadata bytes try and use some from + * the global reserve. + */ + if (ret && block_rsv != global_rsv) { + ret = block_rsv_use_bytes(global_rsv, blocksize); + if (!ret) + return global_rsv; + return ERR_PTR(ret); + } else if (ret) { return ERR_PTR(ret); + } return block_rsv; } ret = block_rsv_use_bytes(block_rsv, blocksize); if (!ret) return block_rsv; + if (ret) { + WARN_ON(1); + ret = reserve_metadata_bytes(trans, root, block_rsv, blocksize, + 0); + if (!ret) { + spin_lock(&block_rsv->lock); + block_rsv->size += blocksize; + spin_unlock(&block_rsv->lock); + return block_rsv; + } else if (ret && block_rsv != global_rsv) { + ret = block_rsv_use_bytes(global_rsv, blocksize); + if (!ret) + return global_rsv; + } + } return ERR_PTR(-ENOSPC); } -- cgit v0.10.2 From ad0397a7a97f55fd7f70998ec208c5d8b90310ff Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Fri, 28 Jan 2011 18:44:44 +0000 Subject: Btrfs: do error checking in btrfs_del_csums Got a report of a box panicing because we got a NULL eb in read_extent_buffer. His fs was borked and btrfs_search_path returned EIO, but we don't check for errors so the box paniced. Yes I know this will just make something higher up the stack panic, but that's a problem for future Josef. Thanks, Signed-off-by: Josef Bacik Signed-off-by: Chris Mason diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c index d0bc726..4f19a3e 100644 --- a/fs/btrfs/file-item.c +++ b/fs/btrfs/file-item.c @@ -550,7 +550,10 @@ int btrfs_del_csums(struct btrfs_trans_handle *trans, if (path->slots[0] == 0) goto out; path->slots[0]--; + } else if (ret < 0) { + goto out; } + leaf = path->nodes[0]; btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); -- cgit v0.10.2 From 7adf5dfbb3af65a00e20b3ead224c3a1b40e4ec4 Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Tue, 25 Jan 2011 22:11:54 +0000 Subject: Btrfs: handle no memory properly in prepare_pages Instead of doing a BUG_ON(1) in prepare_pages if grab_cache_page() fails, just loop through the pages we've already grabbed and unlock and release them, then return -ENOMEM like we should. Thanks, Signed-off-by: Josef Bacik Signed-off-by: Chris Mason diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 65b2424..9e097fb 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -792,8 +792,12 @@ again: for (i = 0; i < num_pages; i++) { pages[i] = grab_cache_page(inode->i_mapping, index + i); if (!pages[i]) { - err = -ENOMEM; - BUG_ON(1); + int c; + for (c = i - 1; c >= 0; c--) { + unlock_page(pages[c]); + page_cache_release(pages[c]); + } + return -ENOMEM; } wait_on_page_writeback(pages[i]); } -- cgit v0.10.2 From b1953bcec95c189b1eea690a08e89646d7750bda Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Fri, 21 Jan 2011 21:10:01 +0000 Subject: Btrfs: make shrink_delalloc a little friendlier Xfstests 224 will just sit there and spin for ever until eventually we give up flushing delalloc and exit. On my box this took several hours. I could not interrupt this process either, even though we use INTERRUPTIBLE. So do 2 things 1) Keep us from looping over and over again without reclaiming anything 2) If we get interrupted exit the loop I tested this and the test now exits in a reasonable amount of time, and can be interrupted with ctrl+c. Thanks, Signed-off-by: Josef Bacik Signed-off-by: Chris Mason diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index ff6bbfd..f96641a 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -3345,8 +3345,10 @@ static int shrink_delalloc(struct btrfs_trans_handle *trans, u64 reserved; u64 max_reclaim; u64 reclaimed = 0; + long time_left; int pause = 1; int nr_pages = (2 * 1024 * 1024) >> PAGE_CACHE_SHIFT; + int loops = 0; block_rsv = &root->fs_info->delalloc_block_rsv; space_info = block_rsv->space_info; @@ -3359,7 +3361,7 @@ static int shrink_delalloc(struct btrfs_trans_handle *trans, max_reclaim = min(reserved, to_reclaim); - while (1) { + while (loops < 1024) { /* have the flusher threads jump in and do some IO */ smp_mb(); nr_pages = min_t(unsigned long, nr_pages, @@ -3367,8 +3369,12 @@ static int shrink_delalloc(struct btrfs_trans_handle *trans, writeback_inodes_sb_nr_if_idle(root->fs_info->sb, nr_pages); spin_lock(&space_info->lock); - if (reserved > space_info->bytes_reserved) + if (reserved > space_info->bytes_reserved) { + loops = 0; reclaimed += reserved - space_info->bytes_reserved; + } else { + loops++; + } reserved = space_info->bytes_reserved; spin_unlock(&space_info->lock); @@ -3379,7 +3385,12 @@ static int shrink_delalloc(struct btrfs_trans_handle *trans, return -EAGAIN; __set_current_state(TASK_INTERRUPTIBLE); - schedule_timeout(pause); + time_left = schedule_timeout(pause); + + /* We were interrupted, exit */ + if (time_left) + break; + pause <<= 1; if (pause > HZ / 10) pause = HZ / 10; -- cgit v0.10.2 From b31eabd86eb68d3c217e6821078249bc045e698a Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Mon, 31 Jan 2011 16:48:24 -0500 Subject: Btrfs: catch errors from btrfs_sync_log btrfs_sync_log returns -EAGAIN when we need full transaction commits instead of small log commits, but sometimes we were dropping the return value. In practice, we check for this a few different ways, but this is still a bug that can leave off full log commits when we really need them. Signed-off-by: Chris Mason diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c index c25a41d..42dfc30 100644 --- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -2051,6 +2051,7 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans, wait_log_commit(trans, log_root_tree, log_root_tree->log_transid); mutex_unlock(&log_root_tree->log_mutex); + ret = 0; goto out; } atomic_set(&log_root_tree->log_commit[index2], 1); @@ -2115,7 +2116,7 @@ out: smp_mb(); if (waitqueue_active(&root->log_commit_wait[index1])) wake_up(&root->log_commit_wait[index1]); - return 0; + return ret; } static void free_log_tree(struct btrfs_trans_handle *trans, -- cgit v0.10.2 From c87fb6fdcaf7560940b31a0c78c3e6370e3433cf Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Mon, 31 Jan 2011 19:54:59 -0500 Subject: Btrfs: avoid uninit variable warnings in ordered-data.c This one isn't really an uninit variable, but for pretty obscure reasons. Let's make it clearly correct. Signed-off-by: Chris Mason diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c index 2b61e1d..083a554 100644 --- a/fs/btrfs/ordered-data.c +++ b/fs/btrfs/ordered-data.c @@ -141,7 +141,7 @@ static inline struct rb_node *tree_search(struct btrfs_ordered_inode_tree *tree, u64 file_offset) { struct rb_root *root = &tree->tree; - struct rb_node *prev; + struct rb_node *prev = NULL; struct rb_node *ret; struct btrfs_ordered_extent *entry; -- cgit v0.10.2 From 5df67083488ccbad925f583b698ab38f8629a016 Mon Sep 17 00:00:00 2001 From: Tsutomu Itoh Date: Tue, 1 Feb 2011 09:17:35 +0000 Subject: btrfs: checking NULL or not in some functions Because NULL is returned when the memory allocation fails, it is checked whether it is NULL. Signed-off-by: Tsutomu Itoh Signed-off-by: Chris Mason diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index f96641a..9de4ff0 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -6496,6 +6496,8 @@ static noinline int relocate_inode_pages(struct inode *inode, u64 start, int ret = 0; ra = kzalloc(sizeof(*ra), GFP_NOFS); + if (!ra) + return -ENOMEM; mutex_lock(&inode->i_mutex); first_index = start >> PAGE_CACHE_SHIFT; diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 6411ed6..8862dda 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -1920,6 +1920,8 @@ static int submit_extent_page(int rw, struct extent_io_tree *tree, nr = bio_get_nr_vecs(bdev); bio = btrfs_bio_alloc(bdev, sector, nr, GFP_NOFS | __GFP_HIGH); + if (!bio) + return -ENOMEM; bio_add_page(bio, page, page_size, offset); bio->bi_end_io = end_io_func; diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c index 42dfc30..6d66e5c 100644 --- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -2751,7 +2751,13 @@ static int btrfs_log_inode(struct btrfs_trans_handle *trans, log = root->log_root; path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; dst_path = btrfs_alloc_path(); + if (!dst_path) { + btrfs_free_path(path); + return -ENOMEM; + } min_key.objectid = inode->i_ino; min_key.type = BTRFS_INODE_ITEM_KEY; -- cgit v0.10.2 From 98d5dc13e7e74b77ca3b4c3cbded9f48d2dbbbb7 Mon Sep 17 00:00:00 2001 From: Tsutomu Itoh Date: Thu, 20 Jan 2011 06:19:37 +0000 Subject: btrfs: fix return value check of btrfs_start_transaction() The error check of btrfs_start_transaction() is added, and the mistake of the error check on several places is corrected. Signed-off-by: Tsutomu Itoh Signed-off-by: Chris Mason diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 9de4ff0..f07ba21 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -6271,6 +6271,8 @@ int btrfs_drop_snapshot(struct btrfs_root *root, BUG_ON(!wc); trans = btrfs_start_transaction(tree_root, 0); + BUG_ON(IS_ERR(trans)); + if (block_rsv) trans->block_rsv = block_rsv; @@ -6368,6 +6370,7 @@ int btrfs_drop_snapshot(struct btrfs_root *root, btrfs_end_transaction_throttle(trans, tree_root); trans = btrfs_start_transaction(tree_root, 0); + BUG_ON(IS_ERR(trans)); if (block_rsv) trans->block_rsv = block_rsv; } @@ -7587,7 +7590,7 @@ int btrfs_cleanup_reloc_trees(struct btrfs_root *root) if (found) { trans = btrfs_start_transaction(root, 1); - BUG_ON(!trans); + BUG_ON(IS_ERR(trans)); ret = btrfs_commit_transaction(trans, root); BUG_ON(ret); } @@ -7831,7 +7834,7 @@ static noinline int relocate_one_extent(struct btrfs_root *extent_root, trans = btrfs_start_transaction(extent_root, 1); - BUG_ON(!trans); + BUG_ON(IS_ERR(trans)); if (extent_key->objectid == 0) { ret = del_extent_zero(trans, extent_root, path, extent_key); diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 5621818..36bc3f4 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -2357,6 +2357,7 @@ void btrfs_orphan_cleanup(struct btrfs_root *root) */ if (is_bad_inode(inode)) { trans = btrfs_start_transaction(root, 0); + BUG_ON(IS_ERR(trans)); btrfs_orphan_del(trans, inode); btrfs_end_transaction(trans, root); iput(inode); diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 12dabe2..02d224e 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -907,6 +907,10 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root, if (new_size > old_size) { trans = btrfs_start_transaction(root, 0); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + goto out_unlock; + } ret = btrfs_grow_device(trans, device, new_size); btrfs_commit_transaction(trans, root); } else { @@ -2141,9 +2145,9 @@ static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) path->leave_spinning = 1; trans = btrfs_start_transaction(root, 1); - if (!trans) { + if (IS_ERR(trans)) { btrfs_free_path(path); - return -ENOMEM; + return PTR_ERR(trans); } dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); @@ -2337,6 +2341,8 @@ static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp u64 transid; trans = btrfs_start_transaction(root, 0); + if (IS_ERR(trans)) + return PTR_ERR(trans); transid = trans->transid; btrfs_commit_transaction_async(trans, root, 0); diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c index ea99654..1f5556a 100644 --- a/fs/btrfs/relocation.c +++ b/fs/btrfs/relocation.c @@ -2028,6 +2028,7 @@ static noinline_for_stack int merge_reloc_root(struct reloc_control *rc, while (1) { trans = btrfs_start_transaction(root, 0); + BUG_ON(IS_ERR(trans)); trans->block_rsv = rc->block_rsv; ret = btrfs_block_rsv_check(trans, root, rc->block_rsv, @@ -3665,6 +3666,7 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc) while (1) { trans = btrfs_start_transaction(rc->extent_root, 0); + BUG_ON(IS_ERR(trans)); if (update_backref_cache(trans, &rc->backref_cache)) { btrfs_end_transaction(trans, rc->extent_root); @@ -4033,6 +4035,7 @@ static noinline_for_stack int mark_garbage_root(struct btrfs_root *root) int ret; trans = btrfs_start_transaction(root->fs_info->tree_root, 0); + BUG_ON(IS_ERR(trans)); memset(&root->root_item.drop_progress, 0, sizeof(root->root_item.drop_progress)); diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index f4e45fd..0209b5f 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -623,6 +623,8 @@ int btrfs_sync_fs(struct super_block *sb, int wait) btrfs_wait_ordered_extents(root, 0, 0); trans = btrfs_start_transaction(root, 0); + if (IS_ERR(trans)) + return PTR_ERR(trans); ret = btrfs_commit_transaction(trans, root); return ret; } diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c index 6d66e5c..a4bbb85 100644 --- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -3112,6 +3112,7 @@ int btrfs_recover_log_trees(struct btrfs_root *log_root_tree) BUG_ON(!path); trans = btrfs_start_transaction(fs_info->tree_root, 0); + BUG_ON(IS_ERR(trans)); wc.trans = trans; wc.pin = 1; diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index f2d2f4c..7cad593 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -1212,6 +1212,10 @@ static int btrfs_rm_dev_item(struct btrfs_root *root, return -ENOMEM; trans = btrfs_start_transaction(root, 0); + if (IS_ERR(trans)) { + btrfs_free_path(path); + return PTR_ERR(trans); + } key.objectid = BTRFS_DEV_ITEMS_OBJECTID; key.type = BTRFS_DEV_ITEM_KEY; key.offset = device->devid; @@ -1604,6 +1608,12 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path) } trans = btrfs_start_transaction(root, 0); + if (IS_ERR(trans)) { + kfree(device); + ret = PTR_ERR(trans); + goto error; + } + lock_chunks(root); device->barriers = 1; @@ -1872,7 +1882,7 @@ static int btrfs_relocate_chunk(struct btrfs_root *root, return ret; trans = btrfs_start_transaction(root, 0); - BUG_ON(!trans); + BUG_ON(IS_ERR(trans)); lock_chunks(root); @@ -2046,7 +2056,7 @@ int btrfs_balance(struct btrfs_root *dev_root) BUG_ON(ret); trans = btrfs_start_transaction(dev_root, 0); - BUG_ON(!trans); + BUG_ON(IS_ERR(trans)); ret = btrfs_grow_device(trans, device, old_size); BUG_ON(ret); @@ -2212,6 +2222,11 @@ again: /* Shrinking succeeded, else we would be at "done". */ trans = btrfs_start_transaction(root, 0); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + goto done; + } + lock_chunks(root); device->disk_total_bytes = new_size; -- cgit v0.10.2 From 13dbc08987f25d9dba488a34b44b43e3844b027c Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Thu, 3 Feb 2011 02:39:52 +0000 Subject: Btrfs: make sure search_bitmap finds something in remove_from_bitmap When we're cleaning up the tree log we need to be able to remove free space from the block group. The problem is if that free space spans bitmaps we would not find the space since we're looking for too many bytes. So make sure the amount of bytes we search for is limited to either the number of bytes we want, or the number of bytes left in the bitmap. This was tested by a user who was hitting the BUG() after search_bitmap. With this patch he can now mount his fs. Thanks, Signed-off-by: Josef Bacik Signed-off-by: Chris Mason diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index a5501ed..a039065 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -1216,6 +1216,7 @@ again: */ search_start = *offset; search_bytes = *bytes; + search_bytes = min(search_bytes, end - search_start + 1); ret = search_bitmap(block_group, bitmap_info, &search_start, &search_bytes); BUG_ON(ret < 0 || search_start != *offset); -- cgit v0.10.2 From 3c14874acc71180553fb5aba528e3cf57c5b958b Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Wed, 2 Feb 2011 15:53:47 +0000 Subject: Btrfs: exclude super blocks when we read in block groups This has been resulting in a BUT_ON(ret) after btrfs_reserve_extent in btrfs_cow_file_range. The reason is we don't actually calculate the bytes_super for a block group until we go to cache it, which means that the space_info can hand out reservations for space that it doesn't actually have, and we can run out of data space. This is also a problem if you are using space caching since we don't ever calculate bytes_super for the block groups. So instead everytime we read a block group call exclude_super_stripes, which calculates the bytes_super for the block group so it can be left out of the space_info. Then whenever caching completes we just call free_excluded_extents so that the super excluded extents are freed up. Also if we are unmounting and we hit any block groups that haven't been cached we still need to call free_excluded_extents to make sure things are cleaned up properly. Thanks, Reported-by: Arne Jansen Signed-off-by: Josef Bacik Signed-off-by: Chris Mason diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index f07ba21..565e22d 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -320,11 +320,6 @@ static int caching_kthread(void *data) if (!path) return -ENOMEM; - exclude_super_stripes(extent_root, block_group); - spin_lock(&block_group->space_info->lock); - block_group->space_info->bytes_readonly += block_group->bytes_super; - spin_unlock(&block_group->space_info->lock); - last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); /* @@ -467,8 +462,10 @@ static int cache_block_group(struct btrfs_block_group_cache *cache, cache->cached = BTRFS_CACHE_NO; } spin_unlock(&cache->lock); - if (ret == 1) + if (ret == 1) { + free_excluded_extents(fs_info->extent_root, cache); return 0; + } } if (load_cache_only) @@ -4036,6 +4033,7 @@ void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes) num_bytes = ALIGN(num_bytes, root->sectorsize); atomic_dec(&BTRFS_I(inode)->outstanding_extents); + WARN_ON(atomic_read(&BTRFS_I(inode)->outstanding_extents) < 0); spin_lock(&BTRFS_I(inode)->accounting_lock); nr_extents = atomic_read(&BTRFS_I(inode)->outstanding_extents); @@ -8325,6 +8323,13 @@ int btrfs_free_block_groups(struct btrfs_fs_info *info) if (block_group->cached == BTRFS_CACHE_STARTED) wait_block_group_cache_done(block_group); + /* + * We haven't cached this block group, which means we could + * possibly have excluded extents on this block group. + */ + if (block_group->cached == BTRFS_CACHE_NO) + free_excluded_extents(info->extent_root, block_group); + btrfs_remove_free_space_cache(block_group); btrfs_put_block_group(block_group); @@ -8440,6 +8445,13 @@ int btrfs_read_block_groups(struct btrfs_root *root) cache->sectorsize = root->sectorsize; /* + * We need to exclude the super stripes now so that the space + * info has super bytes accounted for, otherwise we'll think + * we have more space than we actually do. + */ + exclude_super_stripes(root, cache); + + /* * check for two cases, either we are full, and therefore * don't need to bother with the caching work since we won't * find any space, or we are empty, and we can just add all @@ -8447,12 +8459,10 @@ int btrfs_read_block_groups(struct btrfs_root *root) * time, particularly in the full case. */ if (found_key.offset == btrfs_block_group_used(&cache->item)) { - exclude_super_stripes(root, cache); cache->last_byte_to_unpin = (u64)-1; cache->cached = BTRFS_CACHE_FINISHED; free_excluded_extents(root, cache); } else if (btrfs_block_group_used(&cache->item) == 0) { - exclude_super_stripes(root, cache); cache->last_byte_to_unpin = (u64)-1; cache->cached = BTRFS_CACHE_FINISHED; add_new_free_space(cache, root->fs_info, -- cgit v0.10.2 From 554233a6e0e8557e8e81e54cc70628d101291122 Mon Sep 17 00:00:00 2001 From: Tsutomu Itoh Date: Thu, 3 Feb 2011 03:16:25 +0000 Subject: btrfs: cleanup error handling in btrfs_unlink_inode() When btrfs_alloc_path() fails, btrfs_free_path() need not be called. Therefore, it changes the branch ahead. Signed-off-by: Tsutomu Itoh Signed-off-by: Chris Mason diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 36bc3f4..c9bc0af 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -2646,7 +2646,7 @@ int btrfs_unlink_inode(struct btrfs_trans_handle *trans, path = btrfs_alloc_path(); if (!path) { ret = -ENOMEM; - goto err; + goto out; } path->leave_spinning = 1; -- cgit v0.10.2 From 8e4eef7a60eeca0fe7503e5cbd3b24ff4941c732 Mon Sep 17 00:00:00 2001 From: Alexey Charkov Date: Wed, 2 Feb 2011 21:15:35 +0000 Subject: btrfs: Drop __exit attribute on btrfs_exit_compress As this function is called in some error paths while not removing the module, the __exit attribute prevents the kernel image from linking when btrfs is compiled in statically. Signed-off-by: Alexey Charkov Signed-off-by: Chris Mason diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c index 3a932f1..4d2110e 100644 --- a/fs/btrfs/compression.c +++ b/fs/btrfs/compression.c @@ -921,7 +921,7 @@ int btrfs_decompress(int type, unsigned char *data_in, struct page *dest_page, return ret; } -void __exit btrfs_exit_compress(void) +void btrfs_exit_compress(void) { free_workspaces(); } -- cgit v0.10.2 From 3a90983dbdcb2f4f48c0d771d8e5b4d88f27fae6 Mon Sep 17 00:00:00 2001 From: "Yan, Zheng" Date: Tue, 18 Jan 2011 13:34:40 +0800 Subject: Btrfs: Fix page count calculation take offset of start position into account when calculating page count. Signed-off-by: Yan, Zheng Signed-off-by: Chris Mason diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 9e097fb..b0ff34b 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -991,8 +991,8 @@ static ssize_t btrfs_file_aio_write(struct kiocb *iocb, size_t write_bytes = min(iov_iter_count(&i), nrptrs * (size_t)PAGE_CACHE_SIZE - offset); - size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >> - PAGE_CACHE_SHIFT; + size_t num_pages = (write_bytes + offset + + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; WARN_ON(num_pages > nrptrs); memset(pages, 0, sizeof(struct page *) * nrptrs); @@ -1022,8 +1022,8 @@ static ssize_t btrfs_file_aio_write(struct kiocb *iocb, copied = btrfs_copy_from_user(pos, num_pages, write_bytes, pages, &i); - dirty_pages = (copied + PAGE_CACHE_SIZE - 1) >> - PAGE_CACHE_SHIFT; + dirty_pages = (copied + offset + PAGE_CACHE_SIZE - 1) >> + PAGE_CACHE_SHIFT; if (num_pages > dirty_pages) { if (copied > 0) -- cgit v0.10.2