From: Namjae Jeon <linkinjeon@gmail.com>
To: hirofumi@mail.parknet.co.jp, akpm@linux-foundation.org,
bfields@fieldses.org, viro@zeniv.linux.org.uk
Cc: linux-kernel@vger.kernel.org, Namjae Jeon <linkinjeon@gmail.com>,
Namjae Jeon <namjae.jeon@samsung.com>,
Ravishankar N <ravi.n1@samsung.com>,
Amit Sahrawat <a.sahrawat@samsung.com>
Subject: [PATCH v2 2/5] fat (exportfs): rebuild inode if ilookup() fails
Date: Wed, 5 Sep 2012 00:58:00 +0900 [thread overview]
Message-ID: <1346774280-8068-1-git-send-email-linkinjeon@gmail.com> (raw)
From: Namjae Jeon <namjae.jeon@samsung.com>
Since the previous patch in this patch-set uses i_pos as the inode
number, we can use it to find the directory entry of the inode and
subsequently rebuild the inode if the cache lookups fail.
Since this involves accessing the FAT media,it is better to do this
only if the 'nfs' mount option is enabled.
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Ravishankar N <ravi.n1@samsung.com>
Signed-off-by: Amit Sahrawat <a.sahrawat@samsung.com>
---
fs/fat/nfs.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/fs/fat/nfs.c b/fs/fat/nfs.c
index ef4b5fa..72e62f2 100644
--- a/fs/fat/nfs.c
+++ b/fs/fat/nfs.c
@@ -52,6 +52,31 @@ static struct inode *fat_nfs_get_inode(struct super_block *sb,
iput(inode);
inode = NULL;
}
+ if (inode == NULL && MSDOS_SB(sb)->options.nfs) {
+ struct buffer_head *bh = NULL;
+ struct msdos_dir_entry *de ;
+ loff_t i_pos = (loff_t)ino;
+ int bits = MSDOS_SB(sb)->dir_per_block_bits;
+ loff_t blocknr = i_pos >> bits;
+ bh = sb_bread(sb, blocknr);
+ if (!bh) {
+ fat_msg(sb, KERN_ERR,
+ "unable to read block(%llu) for building NFS inode",
+ (llu)blocknr);
+ return inode;
+ }
+ de = (struct msdos_dir_entry *)bh->b_data;
+ /* If a file is deleted on server and client is not updated
+ * yet, we must not build the inode upon a lookup call.
+ */
+ if (de[i_pos&((1<<bits)-1)].name[0] == DELETED_FLAG)
+
+ inode = NULL;
+ else
+ inode = fat_build_inode(sb, &de[i_pos&((1<<bits)-1)],
+ i_pos);
+ brelse(bh);
+ }
return inode;
}
--
1.7.9.5
reply other threads:[~2012-09-04 15:58 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1346774280-8068-1-git-send-email-linkinjeon@gmail.com \
--to=linkinjeon@gmail.com \
--cc=a.sahrawat@samsung.com \
--cc=akpm@linux-foundation.org \
--cc=bfields@fieldses.org \
--cc=hirofumi@mail.parknet.co.jp \
--cc=linux-kernel@vger.kernel.org \
--cc=namjae.jeon@samsung.com \
--cc=ravi.n1@samsung.com \
--cc=viro@zeniv.linux.org.uk \
--subject='Re: [PATCH v2 2/5] fat (exportfs): rebuild inode if ilookup() fails' \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).