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ceph: fix ceph_dir_llseek()

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Comparing offset with inode->i_sb->s_maxbytes doesn't make sense for
directory. For a fragmented directory, offset (frag_t, off) can be
larger than inode->i_sb->s_maxbytes.

At the very beginning of ceph_dir_llseek(), local variable old_offset
is initialized to parameter offset. This doesn't make sense neither.
Old_offset should be ceph_make_fpos(fi->frag, fi->next_offset).

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Alex Elder <elder@linaro.org>
This commit is contained in:
Yan, Zheng 2014-02-27 16:26:24 +08:00
parent 0ccd592669
commit f049420607
2 changed files with 7 additions and 7 deletions
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12
fs/ceph/dir.c
View File

@ -190,7 +190,7 @@ more:
if (last) {
/* remember our position */
fi->dentry = last;
fi->next_offset = di->offset;
fi->next_offset = fpos_off(di->offset);
}
dput(dentry);
return 0;
@ -369,9 +369,9 @@ more:
fi->next_offset = 0;
off = fi->next_offset;
}
fi->frag = frag;
fi->offset = fi->next_offset;
fi->last_readdir = req;
fi->frag = frag;
if (req->r_reply_info.dir_end) {
kfree(fi->last_name);
@ -474,7 +474,7 @@ static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
{
struct ceph_file_info *fi = file->private_data;
struct inode *inode = file->f_mapping->host;
loff_t old_offset = offset;
loff_t old_offset = ceph_make_fpos(fi->frag, fi->next_offset);
loff_t retval;
mutex_lock(&inode->i_mutex);
@ -491,7 +491,7 @@ static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
goto out;
}
if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) {
if (offset >= 0) {
if (offset != file->f_pos) {
file->f_pos = offset;
file->f_version = 0;
@ -504,14 +504,14 @@ static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
* seek to new frag, or seek prior to current chunk.
*/
if (offset == 0 ||
fpos_frag(offset) != fpos_frag(old_offset) ||
fpos_frag(offset) != fi->frag ||
fpos_off(offset) < fi->offset) {
dout("dir_llseek dropping %p content\n", file);
reset_readdir(fi);
}
/* bump dir_release_count if we did a forward seek */
if (offset > old_offset)
if (fpos_cmp(offset, old_offset) > 0)
fi->dir_release_count--;
}
out:

2
fs/ceph/super.h
View File

@ -577,7 +577,7 @@ struct ceph_file_info {
/* readdir: position within a frag */
unsigned offset; /* offset of last chunk, adjusted for . and .. */
u64 next_offset; /* offset of next chunk (last_name's + 1) */
unsigned next_offset; /* offset of next chunk (last_name's + 1) */
char *last_name; /* last entry in previous chunk */
struct dentry *dentry; /* next dentry (for dcache readdir) */
int dir_release_count;