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author | Abhishek Kulkarni <adkulkar@umail.iu.edu> | 2009-09-23 20:00:27 +0200 |
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committer | Eric Van Hensbergen <ericvh@strongmad.austin.ibm.com> | 2009-09-23 20:03:46 +0200 |
commit | 60e78d2c993e58d890596d951fff77d5965adcd6 (patch) | |
tree | 3d53ed7254c613ef8d8de36fdceda25bc493f4f7 /fs/9p/vfs_file.c | |
parent | 9p: Fix the incorrect update of inode size in v9fs_file_write() (diff) | |
download | linux-60e78d2c993e58d890596d951fff77d5965adcd6.tar.xz linux-60e78d2c993e58d890596d951fff77d5965adcd6.zip |
9p: Add fscache support to 9p
This patch adds a persistent, read-only caching facility for
9p clients using the FS-Cache caching backend.
When the fscache facility is enabled, each inode is associated
with a corresponding vcookie which is an index into the FS-Cache
indexing tree. The FS-Cache indexing tree is indexed at 3 levels:
- session object associated with each mount.
- inode/vcookie
- actual data (pages)
A cache tag is chosen randomly for each session. These tags can
be read off /sys/fs/9p/caches and can be passed as a mount-time
parameter to re-attach to the specified caching session.
Signed-off-by: Abhishek Kulkarni <adkulkar@umail.iu.edu>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'fs/9p/vfs_file.c')
-rw-r--r-- | fs/9p/vfs_file.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c index cafaa46434ba..3902bf43a088 100644 --- a/fs/9p/vfs_file.c +++ b/fs/9p/vfs_file.c @@ -41,6 +41,7 @@ #include "v9fs.h" #include "v9fs_vfs.h" #include "fid.h" +#include "cache.h" static const struct file_operations v9fs_cached_file_operations; @@ -86,6 +87,10 @@ int v9fs_file_open(struct inode *inode, struct file *file) /* enable cached file options */ if(file->f_op == &v9fs_file_operations) file->f_op = &v9fs_cached_file_operations; + +#ifdef CONFIG_9P_FSCACHE + v9fs_cache_inode_set_cookie(inode, file); +#endif } return 0; @@ -238,8 +243,9 @@ v9fs_file_write(struct file *filp, const char __user * data, if (total > 0) { pg_start = origin >> PAGE_CACHE_SHIFT; pg_end = (origin + total - 1) >> PAGE_CACHE_SHIFT; - invalidate_inode_pages2_range(inode->i_mapping, pg_start, - pg_end); + if (inode->i_mapping && inode->i_mapping->nrpages) + invalidate_inode_pages2_range(inode->i_mapping, + pg_start, pg_end); *offset += total; i_size_write(inode, i_size_read(inode) + total); inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; |