The patch titled
fuse: fix max i/o size calculation
has been added to the -mm tree. Its filename is
fuse-fix-max-i-o-size-calculation.patch
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The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: fuse: fix max i/o size calculation
From: Miklos Szeredi <mszeredi@xxxxxxx>
Fix a bug that Werner Baumann reported: fuse can send a bigger write request
than the maximum specified. This only affected direct_io operation.
In addition set a sane minimum for the max_read and max_write tunables, so I/O
always makes some progress.
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/fuse/file.c | 7 ++++---
fs/fuse/inode.c | 3 ++-
2 files changed, 6 insertions(+), 4 deletions(-)
diff -puN fs/fuse/file.c~fuse-fix-max-i-o-size-calculation fs/fuse/file.c
--- a/fs/fuse/file.c~fuse-fix-max-i-o-size-calculation
+++ a/fs/fuse/file.c
@@ -966,14 +966,15 @@ static ssize_t fuse_direct_io(struct fil
while (count) {
size_t nres;
- size_t nbytes = min(count, nmax);
- int err = fuse_get_user_pages(req, buf, nbytes, !write);
+ size_t nbytes_limit = min(count, nmax);
+ size_t nbytes;
+ int err = fuse_get_user_pages(req, buf, nbytes_limit, !write);
if (err) {
res = err;
break;
}
nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset;
- nbytes = min(count, nbytes);
+ nbytes = min(nbytes_limit, nbytes);
if (write)
nres = fuse_send_write(req, file, inode, pos, nbytes,
current->files);
diff -puN fs/fuse/inode.c~fuse-fix-max-i-o-size-calculation fs/fuse/inode.c
--- a/fs/fuse/inode.c~fuse-fix-max-i-o-size-calculation
+++ a/fs/fuse/inode.c
@@ -584,6 +584,7 @@ static void process_init_reply(struct fu
fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
fc->minor = arg->minor;
fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
+ fc->max_write = min_t(unsigned, 4096, fc->max_write);
fc->conn_init = 1;
}
fuse_put_request(fc, req);
@@ -658,7 +659,7 @@ static int fuse_fill_super(struct super_
fc->flags = d.flags;
fc->user_id = d.user_id;
fc->group_id = d.group_id;
- fc->max_read = d.max_read;
+ fc->max_read = min_t(unsigned, 4096, d.max_read);
/* Used by get_root_inode() */
sb->s_fs_info = fc;
_
Patches currently in -mm which might be from mszeredi@xxxxxxx are
origin.patch
git-nfsd.patch
mm-rotate_reclaimable_page-cleanup.patch
vfs-remove-lives_below_in_same_fs.patch
ecryptfs-add-missing-lock-around-notify_change.patch
mm-bdi-export-bdi-attributes-in-sysfs.patch
mm-bdi-export-bdi-attributes-in-sysfs-fix.patch
mm-bdi-export-bdi-attributes-in-sysfs-fix-2.patch
mm-bdi-export-bdi-attributes-in-sysfs-fix-3.patch
mm-bdi-export-bdi-attributes-in-sysfs-fix-4.patch
mm-bdi-export-bdi-attributes-in-sysfs-ia64-fix.patch
mm-bdi-expose-the-bdi-object-in-sysfs-for-nfs.patch
mm-bdi-expose-the-bdi-object-in-sysfs-for-nfs-fix.patch
mm-bdi-expose-the-bdi-object-in-sysfs-for-fuse.patch
mm-bdi-expose-the-bdi-object-in-sysfs-for-fuse-fix.patch
mm-bdi-allow-setting-a-minimum-for-the-bdi-dirty-limit.patch
mm-bdi-allow-setting-a-maximum-for-the-bdi-dirty-limit.patch
mm-bdi-allow-setting-a-maximum-for-the-bdi-dirty-limit-fix.patch
mm-bdi-move-statistics-to-debugfs.patch
mm-bdi-add-separate-writeback-accounting-capability.patch
mm-bdi-export-bdi_writeout_inc.patch
mm-bdi-export-bdi_writeout_inc-fix.patch
mm-add-nr_writeback_temp-counter.patch
mm-add-nr_writeback_temp-counter-fix.patch
mm-document-missing-fields-for-proc-meminfo.patch
fuse-support-writable-mmap.patch
fuse-support-writable-mmap-fix.patch
fuse-clean-up-setting-i_size-in-write.patch
fuse-implement-perform_write.patch
fuse-update-file-size-on-short-read.patch
fuse-update-file-size-on-short-read-fix.patch
fuse-fix-max-i-o-size-calculation.patch
fuse-fix-node-id-type.patch
fuse-fix-race-in-llseek.patch
fuse-fix-race-in-llseek-fix.patch
fuse-fix-sparse-warnings.patch
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