diff options
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/ext4.h | 3 | ||||
| -rw-r--r-- | fs/ext4/extents.c | 16 | ||||
| -rw-r--r-- | fs/ext4/inode.c | 62 |
3 files changed, 35 insertions, 46 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 25e261da871f..2ebfcde5a156 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -2596,8 +2596,7 @@ struct ext4_extent; extern int ext4_ext_tree_init(handle_t *handle, struct inode *); extern int ext4_ext_writepage_trans_blocks(struct inode *, int); -extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, - int chunk); +extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents); extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, struct ext4_map_blocks *map, int flags); extern void ext4_ext_truncate(handle_t *, struct inode *); diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 299ee9df546f..94283d06cace 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -2328,17 +2328,15 @@ int ext4_ext_calc_credits_for_single_extent(struct inode *inode, int nrblocks, } /* - * How many index/leaf blocks need to change/allocate to modify nrblocks? + * How many index/leaf blocks need to change/allocate to add @extents extents? * - * if nrblocks are fit in a single extent (chunk flag is 1), then - * in the worse case, each tree level index/leaf need to be changed - * if the tree split due to insert a new extent, then the old tree - * index/leaf need to be updated too + * If we add a single extent, then in the worse case, each tree level + * index/leaf need to be changed in case of the tree split. * - * If the nrblocks are discontiguous, they could cause - * the whole tree split more than once, but this is really rare. + * If more extents are inserted, they could cause the whole tree split more + * than once, but this is really rare. */ -int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, int chunk) +int ext4_ext_index_trans_blocks(struct inode *inode, int extents) { int index; int depth; @@ -2349,7 +2347,7 @@ int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, int chunk) depth = ext_depth(inode); - if (chunk) + if (extents <= 1) index = depth * 2; else index = depth * 3; diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 23d9a44d721a..2b777e51b677 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -136,6 +136,8 @@ static void ext4_invalidatepage(struct page *page, unsigned int offset, unsigned int length); static int __ext4_journalled_writepage(struct page *page, unsigned int len); static int ext4_bh_delay_or_unwritten(handle_t *handle, struct buffer_head *bh); +static int ext4_meta_trans_blocks(struct inode *inode, int lblocks, + int pextents); /* * Test whether an inode is a fast symlink. @@ -2203,28 +2205,25 @@ static int ext4_writepage(struct page *page, } /* - * This is called via ext4_da_writepages() to - * calculate the total number of credits to reserve to fit - * a single extent allocation into a single transaction, - * ext4_da_writpeages() will loop calling this before - * the block allocation. + * mballoc gives us at most this number of blocks... + * XXX: That seems to be only a limitation of ext4_mb_normalize_request(). + * The rest of mballoc seems to handle chunks upto full group size. */ +#define MAX_WRITEPAGES_EXTENT_LEN 2048 +/* + * Calculate the total number of credits to reserve for one writepages + * iteration. This is called from ext4_da_writepages(). We map an extent of + * upto MAX_WRITEPAGES_EXTENT_LEN blocks and then we go on and finish mapping + * the last partial page. So in total we can map MAX_WRITEPAGES_EXTENT_LEN + + * bpp - 1 blocks in bpp different extents. + */ static int ext4_da_writepages_trans_blocks(struct inode *inode) { - int max_blocks = EXT4_I(inode)->i_reserved_data_blocks; - - /* - * With non-extent format the journal credit needed to - * insert nrblocks contiguous block is dependent on - * number of contiguous block. So we will limit - * number of contiguous block to a sane value - */ - if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) && - (max_blocks > EXT4_MAX_TRANS_DATA)) - max_blocks = EXT4_MAX_TRANS_DATA; + int bpp = ext4_journal_blocks_per_page(inode); - return ext4_chunk_trans_blocks(inode, max_blocks); + return ext4_meta_trans_blocks(inode, + MAX_WRITEPAGES_EXTENT_LEN + bpp - 1, bpp); } /* @@ -4650,11 +4649,12 @@ int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, return 0; } -static int ext4_index_trans_blocks(struct inode *inode, int nrblocks, int chunk) +static int ext4_index_trans_blocks(struct inode *inode, int lblocks, + int pextents) { if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) - return ext4_ind_trans_blocks(inode, nrblocks); - return ext4_ext_index_trans_blocks(inode, nrblocks, chunk); + return ext4_ind_trans_blocks(inode, lblocks); + return ext4_ext_index_trans_blocks(inode, pextents); } /* @@ -4668,7 +4668,8 @@ static int ext4_index_trans_blocks(struct inode *inode, int nrblocks, int chunk) * * Also account for superblock, inode, quota and xattr blocks */ -static int ext4_meta_trans_blocks(struct inode *inode, int nrblocks, int chunk) +static int ext4_meta_trans_blocks(struct inode *inode, int lblocks, + int pextents) { ext4_group_t groups, ngroups = ext4_get_groups_count(inode->i_sb); int gdpblocks; @@ -4676,14 +4677,10 @@ static int ext4_meta_trans_blocks(struct inode *inode, int nrblocks, int chunk) int ret = 0; /* - * How many index blocks need to touch to modify nrblocks? - * The "Chunk" flag indicating whether the nrblocks is - * physically contiguous on disk - * - * For Direct IO and fallocate, they calls get_block to allocate - * one single extent at a time, so they could set the "Chunk" flag + * How many index blocks need to touch to map @lblocks logical blocks + * to @pextents physical extents? */ - idxblocks = ext4_index_trans_blocks(inode, nrblocks, chunk); + idxblocks = ext4_index_trans_blocks(inode, lblocks, pextents); ret = idxblocks; @@ -4691,12 +4688,7 @@ static int ext4_meta_trans_blocks(struct inode *inode, int nrblocks, int chunk) * Now let's see how many group bitmaps and group descriptors need * to account */ - groups = idxblocks; - if (chunk) - groups += 1; - else - groups += nrblocks; - + groups = idxblocks + pextents; gdpblocks = groups; if (groups > ngroups) groups = ngroups; @@ -4727,7 +4719,7 @@ int ext4_writepage_trans_blocks(struct inode *inode) int bpp = ext4_journal_blocks_per_page(inode); int ret; - ret = ext4_meta_trans_blocks(inode, bpp, 0); + ret = ext4_meta_trans_blocks(inode, bpp, bpp); /* Account for data blocks for journalled mode */ if (ext4_should_journal_data(inode)) |