From d8926bb3badd36670fecf2de4a062c78bc37430b Mon Sep 17 00:00:00 2001 From: Mark Fasheh Date: Wed, 13 Jul 2011 10:38:47 -0700 Subject: btrfs: don't BUG_ON btrfs_alloc_path() errors This patch fixes many callers of btrfs_alloc_path() which BUG_ON allocation failure. All the sites that are fixed in this patch were checked by me to be fairly trivial to fix because of at least one of two criteria: - Callers of the function catch errors from it already so bubbling the error up will be handled. - Callers of the function might BUG_ON any nonzero return code in which case there is no behavior changed (but we still got to remove a BUG_ON) The following functions were updated: btrfs_lookup_extent, alloc_reserved_tree_block, btrfs_remove_block_group, btrfs_lookup_csums_range, btrfs_csum_file_blocks, btrfs_mark_extent_written, btrfs_inode_by_name, btrfs_new_inode, btrfs_symlink, insert_reserved_file_extent, and run_delalloc_nocow Signed-off-by: Mark Fasheh --- fs/btrfs/inode.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) (limited to 'fs/btrfs/inode.c') diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 3601f0aebddf..8be7d7a759ce 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -1070,7 +1070,8 @@ static noinline int run_delalloc_nocow(struct inode *inode, u64 ino = btrfs_ino(inode); path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) + return -ENOMEM; nolock = is_free_space_inode(root, inode); @@ -1644,7 +1645,8 @@ static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, int ret; path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) + return -ENOMEM; path->leave_spinning = 1; @@ -3713,7 +3715,8 @@ static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, int ret = 0; path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) + return -ENOMEM; di = btrfs_lookup_dir_item(NULL, root, path, btrfs_ino(dir), name, namelen, 0); @@ -4438,7 +4441,8 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, int owner; path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) + return ERR_PTR(-ENOMEM); inode = new_inode(root->fs_info->sb); if (!inode) { @@ -7194,7 +7198,11 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry, goto out_unlock; path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) { + err = -ENOMEM; + drop_inode = 1; + goto out_unlock; + } key.objectid = btrfs_ino(inode); key.offset = 0; btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); -- cgit v1.2.3 From 0eb0e19cde6f01397ef8c0e094e44beb75c62a1e Mon Sep 17 00:00:00 2001 From: Mark Fasheh Date: Tue, 12 Jul 2011 16:44:10 -0700 Subject: btrfs: Don't BUG_ON alloc_path errors in btrfs_truncate_inode_items I moved the path allocation up a few lines to the top of the function so that we couldn't get into the state where we've dropped delayed items and the extent cache but fail due to -ENOMEM. Signed-off-by: Mark Fasheh --- fs/btrfs/inode.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) (limited to 'fs/btrfs/inode.c') diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 8be7d7a759ce..a0faf7d7f0e0 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -3172,6 +3172,11 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, BUG_ON(new_size > 0 && min_type != BTRFS_EXTENT_DATA_KEY); + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + path->reada = -1; + if (root->ref_cows || root == root->fs_info->tree_root) btrfs_drop_extent_cache(inode, new_size & (~mask), (u64)-1, 0); @@ -3184,10 +3189,6 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, if (min_type == 0 && root == BTRFS_I(inode)->root) btrfs_kill_delayed_inode_items(inode); - path = btrfs_alloc_path(); - BUG_ON(!path); - path->reada = -1; - key.objectid = ino; key.offset = (u64)-1; key.type = (u8)-1; -- cgit v1.2.3 From 1748f843a0190ef4332d03a64263f383af72682b Mon Sep 17 00:00:00 2001 From: Mark Fasheh Date: Tue, 12 Jul 2011 11:25:31 -0700 Subject: btrfs: Don't BUG_ON alloc_path errors in btrfs_read_locked_inode btrfs_iget() also needed an update so that errors from btrfs_locked_inode() are caught and bubbled back up. Signed-off-by: Mark Fasheh --- fs/btrfs/inode.c | 22 +++++++++++++++++----- 1 file changed, 17 insertions(+), 5 deletions(-) (limited to 'fs/btrfs/inode.c') diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index a0faf7d7f0e0..88829993db6c 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -2518,7 +2518,9 @@ static void btrfs_read_locked_inode(struct inode *inode) filled = true; path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) + goto make_bad; + path->leave_spinning = 1; memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); @@ -3973,6 +3975,7 @@ struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, struct btrfs_root *root, int *new) { struct inode *inode; + int bad_inode = 0; inode = btrfs_iget_locked(s, location->objectid, root); if (!inode) @@ -3982,10 +3985,19 @@ struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, BTRFS_I(inode)->root = root; memcpy(&BTRFS_I(inode)->location, location, sizeof(*location)); btrfs_read_locked_inode(inode); - inode_tree_add(inode); - unlock_new_inode(inode); - if (new) - *new = 1; + if (!is_bad_inode(inode)) { + inode_tree_add(inode); + unlock_new_inode(inode); + if (new) + *new = 1; + } else { + bad_inode = 1; + } + } + + if (bad_inode) { + iput(inode); + inode = ERR_PTR(-ESTALE); } return inode; -- cgit v1.2.3 From b532402e4d147e4f409c4e7f50d4413e8450101d Mon Sep 17 00:00:00 2001 From: Tsutomu Itoh Date: Tue, 19 Jul 2011 07:27:20 +0000 Subject: Btrfs: return error to caller when btrfs_unlink() failes When btrfs_unlink_inode() and btrfs_orphan_add() in btrfs_unlink() are error, the error code is returned to the caller instead of BUG_ON(). Signed-off-by: Tsutomu Itoh Signed-off-by: Chris Mason --- fs/btrfs/extent-tree.c | 3 ++- fs/btrfs/inode.c | 10 +++++++--- 2 files changed, 9 insertions(+), 4 deletions(-) (limited to 'fs/btrfs/inode.c') diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 55bddffede73..db2057f262ad 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -7201,7 +7201,8 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans, inode = lookup_free_space_inode(root, block_group, path); if (!IS_ERR(inode)) { - btrfs_orphan_add(trans, inode); + ret = btrfs_orphan_add(trans, inode); + BUG_ON(ret); clear_nlink(inode); /* One for the block groups ref */ spin_lock(&block_group->lock); diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 4360ccb191b1..5da43aea205f 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -2217,7 +2217,8 @@ int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode) if (!root->orphan_block_rsv) { block_rsv = btrfs_alloc_block_rsv(root); - BUG_ON(!block_rsv); + if (!block_rsv) + return -ENOMEM; } spin_lock(&root->orphan_lock); @@ -3002,13 +3003,16 @@ static int btrfs_unlink(struct inode *dir, struct dentry *dentry) ret = btrfs_unlink_inode(trans, root, dir, dentry->d_inode, dentry->d_name.name, dentry->d_name.len); - BUG_ON(ret); + if (ret) + goto out; if (inode->i_nlink == 0) { ret = btrfs_orphan_add(trans, inode); - BUG_ON(ret); + if (ret) + goto out; } +out: nr = trans->blocks_used; __unlink_end_trans(trans, root); btrfs_btree_balance_dirty(root, nr); -- cgit v1.2.3 From b6973aa62253f3791ef6fa5e9f9de099645fc2bd Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Wed, 20 Jul 2011 03:46:35 +0000 Subject: Btrfs: fix readahead in file defrag We passed the wrong value to btrfs_force_ra(). Fix this by changing the argument of btrfs_force_ra() from last_index to nr_page. Signed-off-by: Li Zefan Signed-off-by: Chris Mason --- fs/btrfs/ctree.h | 11 ++++++++--- fs/btrfs/inode.c | 13 ------------- 2 files changed, 8 insertions(+), 16 deletions(-) (limited to 'fs/btrfs/inode.c') diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 3be57c611040..7ac4d25fd4f8 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -2520,6 +2520,14 @@ int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end, #define PageChecked PageFsMisc #endif +/* This forces readahead on a given range of bytes in an inode */ +static inline void btrfs_force_ra(struct address_space *mapping, + struct file_ra_state *ra, struct file *file, + pgoff_t offset, unsigned long req_size) +{ + page_cache_sync_readahead(mapping, ra, file, offset, req_size); +} + struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry); int btrfs_set_inode_index(struct inode *dir, u64 *index); int btrfs_unlink_inode(struct btrfs_trans_handle *trans, @@ -2548,9 +2556,6 @@ int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, int btrfs_merge_bio_hook(struct page *page, unsigned long offset, size_t size, struct bio *bio, unsigned long bio_flags); -unsigned long btrfs_force_ra(struct address_space *mapping, - struct file_ra_state *ra, struct file *file, - pgoff_t offset, pgoff_t last_index); int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); int btrfs_readpage(struct file *file, struct page *page); void btrfs_evict_inode(struct inode *inode); diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 5da43aea205f..69e448eddf09 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -6697,19 +6697,6 @@ int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, return 0; } -/* helper function for file defrag and space balancing. This - * forces readahead on a given range of bytes in an inode - */ -unsigned long btrfs_force_ra(struct address_space *mapping, - struct file_ra_state *ra, struct file *file, - pgoff_t offset, pgoff_t last_index) -{ - pgoff_t req_size = last_index - offset + 1; - - page_cache_sync_readahead(mapping, ra, file, offset, req_size); - return offset + req_size; -} - struct inode *btrfs_alloc_inode(struct super_block *sb) { struct btrfs_inode *ei; -- cgit v1.2.3 From 1bf85046e493c88be1c1bad9084428373089f618 Mon Sep 17 00:00:00 2001 From: Jeff Mahoney Date: Thu, 21 Jul 2011 16:56:09 +0000 Subject: btrfs: Make extent-io callbacks that never fail return void The set/clear bit and the extent split/merge hooks only ever return 0. Changing them to return void simplifies the error handling cases later. This patch changes the hook prototypes, the single implementation of each, and the functions that call them to return void instead. Since all four of these hooks execute under a spinlock, they're necessarily simple. Signed-off-by: Jeff Mahoney Signed-off-by: Chris Mason --- fs/btrfs/extent_io.c | 52 ++++++++++++++-------------------------------------- fs/btrfs/extent_io.h | 18 +++++++++--------- fs/btrfs/inode.c | 26 +++++++++++--------------- 3 files changed, 34 insertions(+), 62 deletions(-) (limited to 'fs/btrfs/inode.c') diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 5bbdb243bb6f..789d0b23048f 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -254,14 +254,14 @@ static void merge_cb(struct extent_io_tree *tree, struct extent_state *new, * * This should be called with the tree lock held. */ -static int merge_state(struct extent_io_tree *tree, - struct extent_state *state) +static void merge_state(struct extent_io_tree *tree, + struct extent_state *state) { struct extent_state *other; struct rb_node *other_node; if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) - return 0; + return; other_node = rb_prev(&state->rb_node); if (other_node) { @@ -287,19 +287,13 @@ static int merge_state(struct extent_io_tree *tree, free_extent_state(other); } } - - return 0; } -static int set_state_cb(struct extent_io_tree *tree, +static void set_state_cb(struct extent_io_tree *tree, struct extent_state *state, int *bits) { - if (tree->ops && tree->ops->set_bit_hook) { - return tree->ops->set_bit_hook(tree->mapping->host, - state, bits); - } - - return 0; + if (tree->ops && tree->ops->set_bit_hook) + tree->ops->set_bit_hook(tree->mapping->host, state, bits); } static void clear_state_cb(struct extent_io_tree *tree, @@ -325,7 +319,6 @@ static int insert_state(struct extent_io_tree *tree, { struct rb_node *node; int bits_to_set = *bits & ~EXTENT_CTLBITS; - int ret; if (end < start) { printk(KERN_ERR "btrfs end < start %llu %llu\n", @@ -335,9 +328,7 @@ static int insert_state(struct extent_io_tree *tree, } state->start = start; state->end = end; - ret = set_state_cb(tree, state, bits); - if (ret) - return ret; + set_state_cb(tree, state, bits); if (bits_to_set & EXTENT_DIRTY) tree->dirty_bytes += end - start + 1; @@ -357,13 +348,11 @@ static int insert_state(struct extent_io_tree *tree, return 0; } -static int split_cb(struct extent_io_tree *tree, struct extent_state *orig, +static void split_cb(struct extent_io_tree *tree, struct extent_state *orig, u64 split) { if (tree->ops && tree->ops->split_extent_hook) - return tree->ops->split_extent_hook(tree->mapping->host, - orig, split); - return 0; + tree->ops->split_extent_hook(tree->mapping->host, orig, split); } /* @@ -670,23 +659,18 @@ out: return 0; } -static int set_state_bits(struct extent_io_tree *tree, +static void set_state_bits(struct extent_io_tree *tree, struct extent_state *state, int *bits) { - int ret; int bits_to_set = *bits & ~EXTENT_CTLBITS; - ret = set_state_cb(tree, state, bits); - if (ret) - return ret; + set_state_cb(tree, state, bits); if ((bits_to_set & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) { u64 range = state->end - state->start + 1; tree->dirty_bytes += range; } state->state |= bits_to_set; - - return 0; } static void cache_state(struct extent_state *state, @@ -779,9 +763,7 @@ hit_next: goto out; } - err = set_state_bits(tree, state, &bits); - if (err) - goto out; + set_state_bits(tree, state, &bits); cache_state(state, cached_state); merge_state(tree, state); @@ -830,9 +812,7 @@ hit_next: if (err) goto out; if (state->end <= end) { - err = set_state_bits(tree, state, &bits); - if (err) - goto out; + set_state_bits(tree, state, &bits); cache_state(state, cached_state); merge_state(tree, state); if (last_end == (u64)-1) @@ -893,11 +873,7 @@ hit_next: err = split_state(tree, state, prealloc, end + 1); BUG_ON(err == -EEXIST); - err = set_state_bits(tree, prealloc, &bits); - if (err) { - prealloc = NULL; - goto out; - } + set_state_bits(tree, prealloc, &bits); cache_state(prealloc, cached_state); merge_state(tree, prealloc); prealloc = NULL; diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index 21a7ca9e7282..d6871dc7524f 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -76,15 +76,15 @@ struct extent_io_ops { struct extent_state *state); int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end, struct extent_state *state, int uptodate); - int (*set_bit_hook)(struct inode *inode, struct extent_state *state, - int *bits); - int (*clear_bit_hook)(struct inode *inode, struct extent_state *state, - int *bits); - int (*merge_extent_hook)(struct inode *inode, - struct extent_state *new, - struct extent_state *other); - int (*split_extent_hook)(struct inode *inode, - struct extent_state *orig, u64 split); + void (*set_bit_hook)(struct inode *inode, struct extent_state *state, + int *bits); + void (*clear_bit_hook)(struct inode *inode, struct extent_state *state, + int *bits); + void (*merge_extent_hook)(struct inode *inode, + struct extent_state *new, + struct extent_state *other); + void (*split_extent_hook)(struct inode *inode, + struct extent_state *orig, u64 split); int (*write_cache_pages_lock_hook)(struct page *page); }; diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 69e448eddf09..34195f9fc6bb 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -1283,17 +1283,16 @@ static int run_delalloc_range(struct inode *inode, struct page *locked_page, return ret; } -static int btrfs_split_extent_hook(struct inode *inode, - struct extent_state *orig, u64 split) +static void btrfs_split_extent_hook(struct inode *inode, + struct extent_state *orig, u64 split) { /* not delalloc, ignore it */ if (!(orig->state & EXTENT_DELALLOC)) - return 0; + return; spin_lock(&BTRFS_I(inode)->lock); BTRFS_I(inode)->outstanding_extents++; spin_unlock(&BTRFS_I(inode)->lock); - return 0; } /* @@ -1302,18 +1301,17 @@ static int btrfs_split_extent_hook(struct inode *inode, * extents, such as when we are doing sequential writes, so we can properly * account for the metadata space we'll need. */ -static int btrfs_merge_extent_hook(struct inode *inode, - struct extent_state *new, - struct extent_state *other) +static void btrfs_merge_extent_hook(struct inode *inode, + struct extent_state *new, + struct extent_state *other) { /* not delalloc, ignore it */ if (!(other->state & EXTENT_DELALLOC)) - return 0; + return; spin_lock(&BTRFS_I(inode)->lock); BTRFS_I(inode)->outstanding_extents--; spin_unlock(&BTRFS_I(inode)->lock); - return 0; } /* @@ -1321,8 +1319,8 @@ static int btrfs_merge_extent_hook(struct inode *inode, * bytes in this file, and to maintain the list of inodes that * have pending delalloc work to be done. */ -static int btrfs_set_bit_hook(struct inode *inode, - struct extent_state *state, int *bits) +static void btrfs_set_bit_hook(struct inode *inode, + struct extent_state *state, int *bits) { /* @@ -1352,14 +1350,13 @@ static int btrfs_set_bit_hook(struct inode *inode, } spin_unlock(&root->fs_info->delalloc_lock); } - return 0; } /* * extent_io.c clear_bit_hook, see set_bit_hook for why */ -static int btrfs_clear_bit_hook(struct inode *inode, - struct extent_state *state, int *bits) +static void btrfs_clear_bit_hook(struct inode *inode, + struct extent_state *state, int *bits) { /* * set_bit and clear bit hooks normally require _irqsave/restore @@ -1396,7 +1393,6 @@ static int btrfs_clear_bit_hook(struct inode *inode, } spin_unlock(&root->fs_info->delalloc_lock); } - return 0; } /* -- cgit v1.2.3