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fuse: use iversion for readdir cache verification

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Use the internal iversion counter to make sure modifications of the
directory through this filesystem are not missed by the mtime check (due to
mtime granularity).

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi
2018-10-01 10:07:05 +02:00
parent 7118883b44
commit 261aaba72f
3 changed files with 21 additions and 8 deletions
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5
fs/fuse/readdir.c
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@@ -8,6 +8,7 @@
#include "fuse_i.h"
#include <linux/iversion.h>
#include <linux/posix_acl.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
@@ -447,6 +448,7 @@ retry_locked:
/* Starting cache? Set cache mtime. */
if (!ctx->pos && !fi->rdc.size) {
fi->rdc.mtime = inode->i_mtime;
fi->rdc.iversion = inode_query_iversion(inode);
}
spin_unlock(&fi->rdc.lock);
return UNCACHED;
@@ -457,7 +459,8 @@ retry_locked:
* changed, and reset the cache if so.
*/
if (!ctx->pos) {
if (!timespec64_equal(&fi->rdc.mtime, &inode->i_mtime)) {
if (inode_peek_iversion(inode) != fi->rdc.iversion ||
!timespec64_equal(&fi->rdc.mtime, &inode->i_mtime)) {
fuse_rdc_reset(inode);
goto retry_locked;
}