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authorbharrosh@panasas.com <bharrosh@panasas.com>2010-10-07 14:28:18 -0400
committerBoaz Harrosh <bharrosh@panasas.com>2011-03-15 15:02:50 +0200
commit66cd6cad4919f980dd21307d0150ff251762a264 (patch)
tree4f2d9dc0f9070ce829d03097542e7968e02df41a /fs/exofs/inode.c
parent97178b7b6c84bd14660b89474d27931a1ea65c66 (diff)
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.c19
1 files changed, 15 insertions, 4 deletions
diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c
index fb9d3805610..681b3cb9b4d 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++;