diff options
| author | Pavel Shilovsky <piastry@etersoft.ru> | 2012-05-10 19:49:38 +0400 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@suse.cz> | 2012-05-14 17:06:42 +0200 |
| commit | 45c72cd73c788dd18c8113d4a404d6b4a01decf1 (patch) | |
| tree | 49e28ba927e9485b6feadad7b60ec05d9bb6cff7 /fs/fuse/inode.c | |
| parent | 519c6040ce04474bc893774f866fd8d907b20429 (diff) | |
| download | lwn-45c72cd73c788dd18c8113d4a404d6b4a01decf1.tar.gz lwn-45c72cd73c788dd18c8113d4a404d6b4a01decf1.zip | |
fuse: fix stat call on 32 bit platforms
Now we store attr->ino at inode->i_ino, return attr->ino at the
first time and then return inode->i_ino if the attribute timeout
isn't expired. That's wrong on 32 bit platforms because attr->ino
is 64 bit and inode->i_ino is 32 bit in this case.
Fix this by saving 64 bit ino in fuse_inode structure and returning
it every time we call getattr. Also squash attr->ino into inode->i_ino
explicitly.
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'fs/fuse/inode.c')
| -rw-r--r-- | fs/fuse/inode.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index 26783eb2b1fc..a59cf5e673d7 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -91,6 +91,7 @@ static struct inode *fuse_alloc_inode(struct super_block *sb) fi->nlookup = 0; fi->attr_version = 0; fi->writectr = 0; + fi->orig_ino = 0; INIT_LIST_HEAD(&fi->write_files); INIT_LIST_HEAD(&fi->queued_writes); INIT_LIST_HEAD(&fi->writepages); @@ -139,6 +140,18 @@ static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) return 0; } +/* + * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down + * so that it will fit. + */ +static ino_t fuse_squash_ino(u64 ino64) +{ + ino_t ino = (ino_t) ino64; + if (sizeof(ino_t) < sizeof(u64)) + ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8; + return ino; +} + void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, u64 attr_valid) { @@ -148,7 +161,7 @@ void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, fi->attr_version = ++fc->attr_version; fi->i_time = attr_valid; - inode->i_ino = attr->ino; + inode->i_ino = fuse_squash_ino(attr->ino); inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777); set_nlink(inode, attr->nlink); inode->i_uid = attr->uid; @@ -174,6 +187,8 @@ void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, fi->orig_i_mode = inode->i_mode; if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) inode->i_mode &= ~S_ISVTX; + + fi->orig_ino = attr->ino; } void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, |