diff options
| author | bharrosh@panasas.com <bharrosh@panasas.com> | 2010-10-07 14:28:18 -0400 |
|---|---|---|
| committer | Boaz Harrosh <bharrosh@panasas.com> | 2011-03-15 15:02:50 +0200 |
| commit | 66cd6cad4919f980dd21307d0150ff251762a264 (patch) | |
| tree | 4f2d9dc0f9070ce829d03097542e7968e02df41a /fs/exofs/inode.c | |
| parent | 97178b7b6c84bd14660b89474d27931a1ea65c66 (diff) | |
| download | linux-66cd6cad4919f980dd21307d0150ff251762a264.tar.bz2 | |
exofs: Override read-ahead to align on stripe_size
* Set all inode->i_mapping->backing_dev_info to point to
the per super-block sb->s_bdi.
* Calculating a read_ahead that is:
- preferable 2 stripes long
(Future patch will add a mount option to override this)
- Minimum 128K aligned up to stripe-size
- Caped to maximum-IO-sizes round down to stripe_size.
(Max sizes are governed by max bio-size that fits in a page
times number-of-devices)
CC: Marc Dionne <marc.c.dionne@gmail.com>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Diffstat (limited to 'fs/exofs/inode.c')
| -rw-r--r-- | fs/exofs/inode.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c index fb9d38056103..681b3cb9b4d8 100644 --- a/fs/exofs/inode.c +++ b/fs/exofs/inode.c @@ -43,6 +43,17 @@ enum { BIO_MAX_PAGES_KMALLOC = PAGE_SIZE / sizeof(struct page *), }; +unsigned exofs_max_io_pages(struct exofs_layout *layout, + unsigned expected_pages) +{ + unsigned pages = min_t(unsigned, expected_pages, MAX_PAGES_KMALLOC); + + /* TODO: easily support bio chaining */ + pages = min_t(unsigned, pages, + layout->group_width * BIO_MAX_PAGES_KMALLOC); + return pages; +} + struct page_collect { struct exofs_sb_info *sbi; struct inode *inode; @@ -97,8 +108,7 @@ static void _pcol_reset(struct page_collect *pcol) static int pcol_try_alloc(struct page_collect *pcol) { - unsigned pages = min_t(unsigned, pcol->expected_pages, - MAX_PAGES_KMALLOC); + unsigned pages; if (!pcol->ios) { /* First time allocate io_state */ int ret = exofs_get_io_state(&pcol->sbi->layout, &pcol->ios); @@ -108,8 +118,7 @@ static int pcol_try_alloc(struct page_collect *pcol) } /* TODO: easily support bio chaining */ - pages = min_t(unsigned, pages, - pcol->sbi->layout.group_width * BIO_MAX_PAGES_KMALLOC); + pages = exofs_max_io_pages(&pcol->sbi->layout, pcol->expected_pages); for (; pages; pages >>= 1) { pcol->pages = kmalloc(pages * sizeof(struct page *), @@ -1049,6 +1058,7 @@ struct inode *exofs_iget(struct super_block *sb, unsigned long ino) memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data)); } + inode->i_mapping->backing_dev_info = sb->s_bdi; if (S_ISREG(inode->i_mode)) { inode->i_op = &exofs_file_inode_operations; inode->i_fop = &exofs_file_operations; @@ -1149,6 +1159,7 @@ struct inode *exofs_new_inode(struct inode *dir, int mode) sbi = sb->s_fs_info; + inode->i_mapping->backing_dev_info = sb->s_bdi; sb->s_dirt = 1; inode_init_owner(inode, dir, mode); inode->i_ino = sbi->s_nextid++; |