diff options
| -rw-r--r-- | fs/ext4/ext4.h | 11 | ||||
| -rw-r--r-- | fs/ext4/extents.c | 9 | ||||
| -rw-r--r-- | fs/ext4/inline.c | 233 | ||||
| -rw-r--r-- | fs/ext4/inode.c | 103 | ||||
| -rw-r--r-- | fs/ext4/xattr.h | 26 |
5 files changed, 340 insertions, 42 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index c827e47d556c..9f4efc6c37ba 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -2018,8 +2018,19 @@ struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int, int *); struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int, int *); +int ext4_get_block_write(struct inode *inode, sector_t iblock, + struct buffer_head *bh_result, int create); int ext4_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create); +int ext4_walk_page_buffers(handle_t *handle, + struct buffer_head *head, + unsigned from, + unsigned to, + int *partial, + int (*fn)(handle_t *handle, + struct buffer_head *bh)); +int do_journal_get_write_access(handle_t *handle, + struct buffer_head *bh); extern struct inode *ext4_iget(struct super_block *, unsigned long); extern int ext4_write_inode(struct inode *, struct writeback_control *); diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 1dc19a7b449f..f2659f51b23d 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -42,6 +42,7 @@ #include <linux/fiemap.h> #include "ext4_jbd2.h" #include "ext4_extents.h" +#include "xattr.h" #include <trace/events/ext4.h> @@ -2310,7 +2311,13 @@ int ext4_ext_calc_credits_for_single_extent(struct inode *inode, int nrblocks, int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, int chunk) { int index; - int depth = ext_depth(inode); + int depth; + + /* If we are converting the inline data, only one is needed here. */ + if (ext4_has_inline_data(inode)) + return 1; + + depth = ext_depth(inode); if (chunk) index = depth * 2; diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c index e4a41d5d06db..320ff6fe5d8c 100644 --- a/fs/ext4/inline.c +++ b/fs/ext4/inline.c @@ -14,6 +14,7 @@ #include "ext4_jbd2.h" #include "ext4.h" #include "xattr.h" +#include "truncate.h" #define EXT4_XATTR_SYSTEM_DATA "data" #define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS)) @@ -515,6 +516,238 @@ int ext4_readpage_inline(struct inode *inode, struct page *page) return ret >= 0 ? 0 : ret; } +static int ext4_convert_inline_data_to_extent(struct address_space *mapping, + struct inode *inode, + unsigned flags) +{ + int ret, needed_blocks; + handle_t *handle = NULL; + int retries = 0, sem_held = 0; + struct page *page = NULL; + unsigned from, to; + struct ext4_iloc iloc; + + if (!ext4_has_inline_data(inode)) { + /* + * clear the flag so that no new write + * will trap here again. + */ + ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); + return 0; + } + + needed_blocks = ext4_writepage_trans_blocks(inode); + + ret = ext4_get_inode_loc(inode, &iloc); + if (ret) + return ret; + +retry: + handle = ext4_journal_start(inode, needed_blocks); + if (IS_ERR(handle)) { + ret = PTR_ERR(handle); + handle = NULL; + goto out; + } + + /* We cannot recurse into the filesystem as the transaction is already + * started */ + flags |= AOP_FLAG_NOFS; + + page = grab_cache_page_write_begin(mapping, 0, flags); + if (!page) { + ret = -ENOMEM; + goto out; + } + + down_write(&EXT4_I(inode)->xattr_sem); + sem_held = 1; + /* If some one has already done this for us, just exit. */ + if (!ext4_has_inline_data(inode)) { + ret = 0; + goto out; + } + + from = 0; + to = ext4_get_inline_size(inode); + if (!PageUptodate(page)) { + ret = ext4_read_inline_page(inode, page); + if (ret < 0) + goto out; + } + + ret = ext4_destroy_inline_data_nolock(handle, inode); + if (ret) + goto out; + + if (ext4_should_dioread_nolock(inode)) + ret = __block_write_begin(page, from, to, ext4_get_block_write); + else + ret = __block_write_begin(page, from, to, ext4_get_block); + + if (!ret && ext4_should_journal_data(inode)) { + ret = ext4_walk_page_buffers(handle, page_buffers(page), + from, to, NULL, + do_journal_get_write_access); + } + + if (ret) { + unlock_page(page); + page_cache_release(page); + ext4_orphan_add(handle, inode); + up_write(&EXT4_I(inode)->xattr_sem); + sem_held = 0; + ext4_journal_stop(handle); + handle = NULL; + ext4_truncate_failed_write(inode); + /* + * If truncate failed early the inode might + * still be on the orphan list; we need to + * make sure the inode is removed from the + * orphan list in that case. + */ + if (inode->i_nlink) + ext4_orphan_del(NULL, inode); + } + + if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) + goto retry; + + block_commit_write(page, from, to); +out: + if (page) { + unlock_page(page); + page_cache_release(page); + } + if (sem_held) + up_write(&EXT4_I(inode)->xattr_sem); + if (handle) + ext4_journal_stop(handle); + brelse(iloc.bh); + return ret; +} + +/* + * Try to write data in the inode. + * If the inode has inline data, check whether the new write can be + * in the inode also. If not, create the page the handle, move the data + * to the page make it update and let the later codes create extent for it. + */ +int ext4_try_to_write_inline_data(struct address_space *mapping, + struct inode *inode, + loff_t pos, unsigned len, + unsigned flags, + struct page **pagep) +{ + int ret; + handle_t *handle; + struct page *page; + struct ext4_iloc iloc; + + if (pos + len > ext4_get_max_inline_size(inode)) + goto convert; + + ret = ext4_get_inode_loc(inode, &iloc); + if (ret) + return ret; + + /* + * The possible write could happen in the inode, + * so try to reserve the space in inode first. + */ + handle = ext4_journal_start(inode, 1); + if (IS_ERR(handle)) { + ret = PTR_ERR(handle); + handle = NULL; + goto out; + } + + ret = ext4_prepare_inline_data(handle, inode, pos + len); + if (ret && ret != -ENOSPC) + goto out; + + /* We don't have space in inline inode, so convert it to extent. */ + if (ret == -ENOSPC) { + ext4_journal_stop(handle); + brelse(iloc.bh); + goto convert; + } + + flags |= AOP_FLAG_NOFS; + + page = grab_cache_page_write_begin(mapping, 0, flags); + if (!page) { + ret = -ENOMEM; + goto out; + } + + *pagep = page; + down_read(&EXT4_I(inode)->xattr_sem); + if (!ext4_has_inline_data(inode)) { + ret = 0; + unlock_page(page); + page_cache_release(page); + goto out_up_read; + } + + if (!PageUptodate(page)) { + ret = ext4_read_inline_page(inode, page); + if (ret < 0) + goto out_up_read; + } + + ret = 1; + handle = NULL; +out_up_read: + up_read(&EXT4_I(inode)->xattr_sem); +out: + if (handle) + ext4_journal_stop(handle); + brelse(iloc.bh); + return ret; +convert: + return ext4_convert_inline_data_to_extent(mapping, + inode, flags); +} + +int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len, + unsigned copied, struct page *page) +{ + int ret; + void *kaddr; + struct ext4_iloc iloc; + + if (unlikely(copied < len)) { + if (!PageUptodate(page)) { + copied = 0; + goto out; + } + } + + ret = ext4_get_inode_loc(inode, &iloc); + if (ret) { + ext4_std_error(inode->i_sb, ret); + copied = 0; + goto out; + } + + down_write(&EXT4_I(inode)->xattr_sem); + BUG_ON(!ext4_has_inline_data(inode)); + + kaddr = kmap_atomic(page); + ext4_write_inline_data(inode, &iloc, kaddr, pos, len); + kunmap_atomic(kaddr); + SetPageUptodate(page); + /* clear page dirty so that writepages wouldn't work for us. */ + ClearPageDirty(page); + + up_write(&EXT4_I(inode)->xattr_sem); + brelse(iloc.bh); +out: + return copied; +} + + int ext4_destroy_inline_data(handle_t *handle, struct inode *inode) { int ret; diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 1668abf80549..70c8d5f323f0 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -770,13 +770,13 @@ struct buffer_head *ext4_bread(handle_t *handle, struct inode *inode, return NULL; } -static int walk_page_buffers(handle_t *handle, - struct buffer_head *head, - unsigned from, - unsigned to, - int *partial, - int (*fn)(handle_t *handle, - struct buffer_head *bh)) +int ext4_walk_page_buffers(handle_t *handle, + struct buffer_head *head, + unsigned from, + unsigned to, + int *partial, + int (*fn)(handle_t *handle, + struct buffer_head *bh)) { struct buffer_head *bh; unsigned block_start, block_end; @@ -826,8 +826,8 @@ static int walk_page_buffers(handle_t *handle, * is elevated. We'll still have enough credits for the tiny quotafile * write. */ -static int do_journal_get_write_access(handle_t *handle, - struct buffer_head *bh) +int do_journal_get_write_access(handle_t *handle, + struct buffer_head *bh) { int dirty = buffer_dirty(bh); int ret; @@ -850,8 +850,6 @@ static int do_journal_get_write_access(handle_t *handle, return ret; } -static int ext4_get_block_write(struct inode *inode, sector_t iblock, - struct buffer_head *bh_result, int create); static int ext4_get_block_write_nolock(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create); static int ext4_write_begin(struct file *file, struct address_space *mapping, @@ -876,6 +874,17 @@ static int ext4_write_begin(struct file *file, struct address_space *mapping, from = pos & (PAGE_CACHE_SIZE - 1); to = from + len; + if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) { + ret = ext4_try_to_write_inline_data(mapping, inode, pos, len, + flags, pagep); + if (ret < 0) + goto out; + if (ret == 1) { + ret = 0; + goto out; + } + } + retry: handle = ext4_journal_start(inode, needed_blocks); if (IS_ERR(handle)) { @@ -893,6 +902,7 @@ retry: ret = -ENOMEM; goto out; } + *pagep = page; if (ext4_should_dioread_nolock(inode)) @@ -901,8 +911,9 @@ retry: ret = __block_write_begin(page, pos, len, ext4_get_block); if (!ret && ext4_should_journal_data(inode)) { - ret = walk_page_buffers(handle, page_buffers(page), - from, to, NULL, do_journal_get_write_access); + ret = ext4_walk_page_buffers(handle, page_buffers(page), + from, to, NULL, + do_journal_get_write_access); } if (ret) { @@ -957,7 +968,12 @@ static int ext4_generic_write_end(struct file *file, struct inode *inode = mapping->host; handle_t *handle = ext4_journal_current_handle(); - copied = block_write_end(file, mapping, pos, len, copied, page, fsdata); + if (ext4_has_inline_data(inode)) + copied = ext4_write_inline_data_end(inode, pos, len, + copied, page); + else + copied = block_write_end(file, mapping, pos, + len, copied, page, fsdata); /* * No need to use i_size_read() here, the i_size @@ -1114,8 +1130,8 @@ static int ext4_journalled_write_end(struct file *file, page_zero_new_buffers(page, from+copied, to); } - ret = walk_page_buffers(handle, page_buffers(page), from, - to, &partial, write_end_fn); + ret = ext4_walk_page_buffers(handle, page_buffers(page), from, + to, &partial, write_end_fn); if (!partial) SetPageUptodate(page); new_i_size = pos + copied; @@ -1903,7 +1919,7 @@ static int __ext4_journalled_writepage(struct page *page, ClearPageChecked(page); page_bufs = page_buffers(page); BUG_ON(!page_bufs); - walk_page_buffers(handle, page_bufs, 0, len, NULL, bget_one); + ext4_walk_page_buffers(handle, page_bufs, 0, len, NULL, bget_one); /* As soon as we unlock the page, it can go away, but we have * references to buffers so we are safe */ unlock_page(page); @@ -1916,11 +1932,11 @@ static int __ext4_journalled_writepage(struct page *page, BUG_ON(!ext4_handle_valid(handle)); - ret = walk_page_buffers(handle, page_bufs, 0, len, NULL, - do_journal_get_write_access); + ret = ext4_walk_page_buffers(handle, page_bufs, 0, len, NULL, + do_journal_get_write_access); - err = walk_page_buffers(handle, page_bufs, 0, len, NULL, - write_end_fn); + err = ext4_walk_page_buffers(handle, page_bufs, 0, len, NULL, + write_end_fn); if (ret == 0) ret = err; EXT4_I(inode)->i_datasync_tid = handle->h_transaction->t_tid; @@ -1928,7 +1944,7 @@ static int __ext4_journalled_writepage(struct page *page, if (!ret) ret = err; - walk_page_buffers(handle, page_bufs, 0, len, NULL, bput_one); + ext4_walk_page_buffers(handle, page_bufs, 0, len, NULL, bput_one); ext4_set_inode_state(inode, EXT4_STATE_JDATA); out: return ret; @@ -2007,8 +2023,8 @@ static int ext4_writepage(struct page *page, commit_write = 1; } page_bufs = page_buffers(page); - if (walk_page_buffers(NULL, page_bufs, 0, len, NULL, - ext4_bh_delay_or_unwritten)) { + if (ext4_walk_page_buffers(NULL, page_bufs, 0, len, NULL, + ext4_bh_delay_or_unwritten)) { /* * We don't want to do block allocation, so redirty * the page and return. We may reach here when we do @@ -2831,7 +2847,7 @@ static int ext4_releasepage(struct page *page, gfp_t wait) * We allocate an uinitialized extent if blocks haven't been allocated. * The extent will be converted to initialized after the IO is complete. */ -static int ext4_get_block_write(struct inode *inode, sector_t iblock, +int ext4_get_block_write(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create) { ext4_debug("ext4_get_block_write: inode %lu, create flag %d\n", @@ -3738,7 +3754,8 @@ static inline void ext4_iget_extra_inode(struct inode *inode, if (*magic == cpu_to_le32(EXT4_XATTR_MAGIC)) { ext4_set_inode_state(inode, EXT4_STATE_XATTR); ext4_find_inline_data_nolock(inode); - } + } else + EXT4_I(inode)->i_inline_off = 0; } struct inode *ext4_iget(struct super_block *sb, unsigned long ino) @@ -3907,17 +3924,19 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino) ei->i_file_acl); ret = -EIO; goto bad_inode; - } else if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { - if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || - (S_ISLNK(inode->i_mode) && - !ext4_inode_is_fast_symlink(inode))) - /* Validate extent which is part of inode */ - ret = ext4_ext_check_inode(inode); - } else if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || - (S_ISLNK(inode->i_mode) && - !ext4_inode_is_fast_symlink(inode))) { - /* Validate block references which are part of inode */ - ret = ext4_ind_check_inode(inode); + } else if (!ext4_has_inline_data(inode)) { + if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { + if ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || + (S_ISLNK(inode->i_mode) && + !ext4_inode_is_fast_symlink(inode)))) + /* Validate extent which is part of inode */ + ret = ext4_ext_check_inode(inode); + } else if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || + (S_ISLNK(inode->i_mode) && + !ext4_inode_is_fast_symlink(inode))) { + /* Validate block references which are part of inode */ + ret = ext4_ind_check_inode(inode); + } } if (ret) goto bad_inode; @@ -4104,9 +4123,10 @@ static int ext4_do_update_inode(handle_t *handle, cpu_to_le32(new_encode_dev(inode->i_rdev)); raw_inode->i_block[2] = 0; } - } else + } else if (!ext4_has_inline_data(inode)) { for (block = 0; block < EXT4_N_BLOCKS; block++) raw_inode->i_block[block] = ei->i_data[block]; + } raw_inode->i_disk_version = cpu_to_le32(inode->i_version); if (ei->i_extra_isize) { @@ -4793,8 +4813,9 @@ int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) * journal_start/journal_stop which can block and take a long time */ if (page_has_buffers(page)) { - if (!walk_page_buffers(NULL, page_buffers(page), 0, len, NULL, - ext4_bh_unmapped)) { + if (!ext4_walk_page_buffers(NULL, page_buffers(page), + 0, len, NULL, + ext4_bh_unmapped)) { /* Wait so that we don't change page under IO */ wait_on_page_writeback(page); ret = VM_FAULT_LOCKED; @@ -4815,7 +4836,7 @@ retry_alloc: } ret = __block_page_mkwrite(vma, vmf, get_block); if (!ret && ext4_should_journal_data(inode)) { - if (walk_page_buffers(handle, page_buffers(page), 0, + if (ext4_walk_page_buffers(handle, page_buffers(page), 0, PAGE_CACHE_SIZE, NULL, do_journal_get_write_access)) { unlock_page(page); ret = VM_FAULT_SIGBUS; diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h index 646c9b9be8ed..db5672206238 100644 --- a/fs/ext4/xattr.h +++ b/fs/ext4/xattr.h @@ -141,6 +141,15 @@ extern int ext4_init_inline_data(handle_t *handle, struct inode *inode, extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode); extern int ext4_readpage_inline(struct inode *inode, struct page *page); +extern int ext4_try_to_write_inline_data(struct address_space *mapping, + struct inode *inode, + loff_t pos, unsigned len, + unsigned flags, + struct page **pagep); +extern int ext4_write_inline_data_end(struct inode *inode, + loff_t pos, unsigned len, + unsigned copied, + struct page *page); # else /* CONFIG_EXT4_FS_XATTR */ static inline int @@ -262,6 +271,23 @@ static inline int ext4_readpage_inline(struct inode *inode, struct page *page) { return 0; } + +static inline int ext4_try_to_write_inline_data(struct address_space *mapping, + struct inode *inode, + loff_t pos, unsigned len, + unsigned flags, + struct page **pagep) +{ + return 0; +} + +static inline int ext4_write_inline_data_end(struct inode *inode, + loff_t pos, unsigned len, + unsigned copied, + struct page *page) +{ + return 0; +} # endif /* CONFIG_EXT4_FS_XATTR */ #ifdef CONFIG_EXT4_FS_SECURITY |