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Registered in England and Wales under Company Registration No. 3798903 From: David Howells Subject: [PATCH 29/31] IGET: Stop HOSTFS from using iget() and read_inode() [try #5] To: akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, dhowells@redhat.com Date: Thu, 25 Oct 2007 17:36:26 +0100 Message-ID: <20071025163626.5057.11837.stgit@warthog.procyon.org.uk> In-Reply-To: <20071025163352.5057.59344.stgit@warthog.procyon.org.uk> References: <20071025163352.5057.59344.stgit@warthog.procyon.org.uk> User-Agent: StGIT/0.13 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4194 Lines: 156 Stop the HOSTFS filesystem from using iget() and read_inode(). Provide hostfs_iget(), and call that instead of iget(). hostfs_iget() then uses iget_locked() directly and returns a proper error code instead of an inode in the event of an error. hostfs_fill_sb_common() returns any error incurred when getting the root inode instead of EINVAL. Note that the contents of hostfs_kern.c need to be examined: (*) hostfs_iget() should perhaps subsume init_inode() and hostfs_read_inode(). (*) It would appear that all hostfs inodes are the same inode because iget() was being called with inode number 0 - which forms the lookup key. Signed-off-by: David Howells --- fs/hostfs/hostfs_kern.c | 59 +++++++++++++++++++++++++++++++---------------- 1 files changed, 39 insertions(+), 20 deletions(-) diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c index 8966b05..8aafb53 100644 --- a/fs/hostfs/hostfs_kern.c +++ b/fs/hostfs/hostfs_kern.c @@ -202,7 +202,7 @@ static char *follow_link(char *link) return ERR_PTR(n); } -static int read_inode(struct inode *ino) +static int hostfs_read_inode(struct inode *ino) { char *name; int err = 0; @@ -233,6 +233,25 @@ static int read_inode(struct inode *ino) return err; } +static struct inode *hostfs_iget(struct super_block *sb) +{ + struct inode *inode; + long ret; + + inode = iget_locked(sb, 0); + if (!inode) + return ERR_PTR(-ENOMEM); + if (inode->i_state & I_NEW) { + ret = hostfs_read_inode(inode); + if (ret < 0) { + iget_failed(inode); + return ERR_PTR(ret); + } + unlock_new_inode(inode); + } + return inode; +} + int hostfs_statfs(struct dentry *dentry, struct kstatfs *sf) { /* @@ -303,17 +322,11 @@ static void hostfs_destroy_inode(struct inode *inode) kfree(HOSTFS_I(inode)); } -static void hostfs_read_inode(struct inode *inode) -{ - read_inode(inode); -} - static const struct super_operations hostfs_sbops = { .alloc_inode = hostfs_alloc_inode, .drop_inode = generic_delete_inode, .delete_inode = hostfs_delete_inode, .destroy_inode = hostfs_destroy_inode, - .read_inode = hostfs_read_inode, .statfs = hostfs_statfs, }; @@ -571,10 +584,11 @@ int hostfs_create(struct inode *dir, struct dentry *dentry, int mode, char *name; int error, fd; - error = -ENOMEM; - inode = iget(dir->i_sb, 0); - if (inode == NULL) + inode = hostfs_iget(dir->i_sb); + if (IS_ERR(inode)) { + error = PTR_ERR(inode); goto out; + } error = init_inode(inode, dentry); if (error) @@ -615,10 +629,11 @@ struct dentry *hostfs_lookup(struct inode *ino, struct dentry *dentry, char *name; int err; - err = -ENOMEM; - inode = iget(ino->i_sb, 0); - if (inode == NULL) + inode = hostfs_iget(ino->i_sb); + if (IS_ERR(inode)) { + err = PTR_ERR(inode); goto out; + } err = init_inode(inode, dentry); if (err) @@ -736,11 +751,13 @@ int hostfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) { struct inode *inode; char *name; - int err = -ENOMEM; + int err; - inode = iget(dir->i_sb, 0); - if (inode == NULL) + inode = hostfs_iget(dir->i_sb); + if (IS_ERR(inode)) { + err = PTR_ERR(inode); goto out; + } err = init_inode(inode, dentry); if (err) @@ -952,9 +969,11 @@ static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent) sprintf(host_root_path, "%s/%s", root_ino, req_root); - root_inode = iget(sb, 0); - if (root_inode == NULL) + root_inode = hostfs_iget(sb); + if (IS_ERR(root_inode)) { + err = PTR_ERR(root_inode); goto out_free; + } err = init_inode(root_inode, NULL); if (err) @@ -972,8 +991,8 @@ static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent) if (sb->s_root == NULL) goto out_put; - err = read_inode(root_inode); - if (err) { + err = hostfs_read_inode(root_inode); + if (err){ /* No iput in this case because the dput does that for us */ dput(sb->s_root); sb->s_root = NULL; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/