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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/exofs.h
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/exofs.h')
-rw-r--r--fs/exofs/exofs.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/exofs/exofs.h b/fs/exofs/exofs.h
index 2dc925fa1010..99fcb9126a97 100644
--- a/fs/exofs/exofs.h
+++ b/fs/exofs/exofs.h
@@ -256,6 +256,8 @@ static inline int exofs_oi_read(struct exofs_i_info *oi,
}
/* inode.c */
+unsigned exofs_max_io_pages(struct exofs_layout *layout,
+ unsigned expected_pages);
int exofs_setattr(struct dentry *, struct iattr *);
int exofs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,