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Wed, 16 Aug 2023 05:08:09 +0000 From: Gabriel Krisman Bertazi To: viro@zeniv.linux.org.uk, brauner@kernel.org, tytso@mit.edu, ebiggers@kernel.org, jaegeuk@kernel.org Date: Wed, 16 Aug 2023 01:07:55 -0400 Message-ID: <20230816050803.15660-2-krisman@suse.de> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230816050803.15660-1-krisman@suse.de> References: <20230816050803.15660-1-krisman@suse.de> MIME-Version: 1.0 X-Headers-End: 1qW8lV-006njE-Nz Subject: [f2fs-dev] [PATCH v6 1/9] ecryptfs: Reject casefold directory inodes X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-fsdevel@vger.kernel.org, Gabriel Krisman Bertazi , linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net Even though it seems to be able to resolve some names of case-insensitive directories, the lack of d_hash and d_compare means we end up with a broken state in the d_cache. Considering it was never a goal to support these two together, and we are preparing to use d_revalidate in case-insensitive filesystems, which would make the combination even more broken, reject any attempt to get a casefolded inode from ecryptfs. Signed-off-by: Gabriel Krisman Bertazi --- Changes since v5: - Check IS_CASEFOLDED directly (Eric) --- fs/ecryptfs/inode.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c index 83274915ba6d..01ec2250e40f 100644 --- a/fs/ecryptfs/inode.c +++ b/fs/ecryptfs/inode.c @@ -78,6 +78,14 @@ static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) return ERR_PTR(-EXDEV); + + /* Reject dealing with casefold directories. */ + if (IS_CASEFOLDED(lower_inode)) { + pr_err_ratelimited("%s: Can't handle casefolded directory.\n", + __func__); + return ERR_PTR(-EREMOTE); + } + if (!igrab(lower_inode)) return ERR_PTR(-ESTALE); inode = iget5_locked(sb, (unsigned long)lower_inode, From patchwork Wed Aug 16 05:07:56 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gabriel Krisman Bertazi X-Patchwork-Id: 13354566 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.sourceforge.net (lists.sourceforge.net [216.105.38.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DCD66C001E0 for ; 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Wed, 16 Aug 2023 05:08:10 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id zKPBNbpZ3GTcTgAAMHmgww (envelope-from ); Wed, 16 Aug 2023 05:08:10 +0000 From: Gabriel Krisman Bertazi To: viro@zeniv.linux.org.uk, brauner@kernel.org, tytso@mit.edu, ebiggers@kernel.org, jaegeuk@kernel.org Date: Wed, 16 Aug 2023 01:07:56 -0400 Message-ID: <20230816050803.15660-3-krisman@suse.de> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230816050803.15660-1-krisman@suse.de> References: <20230816050803.15660-1-krisman@suse.de> MIME-Version: 1.0 X-Headers-End: 1qW8lX-006njI-29 Subject: [f2fs-dev] [PATCH v6 2/9] 9p: Split ->weak_revalidate from ->revalidate X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-fsdevel@vger.kernel.org, Gabriel Krisman Bertazi , linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net In preparation to change the signature of dentry_ops->revalidate, avoid reusing the handler directly for d_weak_revalidate in 9p. Signed-off-by: Gabriel Krisman Bertazi --- fs/9p/vfs_dentry.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/fs/9p/vfs_dentry.c b/fs/9p/vfs_dentry.c index f16f73581634..0c6fa1f53530 100644 --- a/fs/9p/vfs_dentry.c +++ b/fs/9p/vfs_dentry.c @@ -94,9 +94,15 @@ static int v9fs_lookup_revalidate(struct dentry *dentry, unsigned int flags) return 1; } +static int v9fs_lookup_weak_revalidate(struct dentry *dentry, + unsigned int flags) +{ + return v9fs_lookup_revalidate(dentry, flags); +} + const struct dentry_operations v9fs_cached_dentry_operations = { .d_revalidate = v9fs_lookup_revalidate, - .d_weak_revalidate = v9fs_lookup_revalidate, + .d_weak_revalidate = v9fs_lookup_weak_revalidate, .d_delete = v9fs_cached_dentry_delete, .d_release = v9fs_dentry_release, }; From patchwork Wed Aug 16 05:07:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gabriel Krisman Bertazi X-Patchwork-Id: 13354570 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.sourceforge.net (lists.sourceforge.net [216.105.38.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id CFEABC04A6A for ; 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Wed, 16 Aug 2023 05:08:12 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id xGPfGbxZ3GTgTgAAMHmgww (envelope-from ); Wed, 16 Aug 2023 05:08:12 +0000 From: Gabriel Krisman Bertazi To: viro@zeniv.linux.org.uk, brauner@kernel.org, tytso@mit.edu, ebiggers@kernel.org, jaegeuk@kernel.org Date: Wed, 16 Aug 2023 01:07:57 -0400 Message-ID: <20230816050803.15660-4-krisman@suse.de> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230816050803.15660-1-krisman@suse.de> References: <20230816050803.15660-1-krisman@suse.de> MIME-Version: 1.0 X-Headers-End: 1qW8lb-0004zQ-My Subject: [f2fs-dev] [PATCH v6 3/9] fs: Expose name under lookup to d_revalidate hooks X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-fsdevel@vger.kernel.org, Gabriel Krisman Bertazi , linux-ext4@vger.kernel.org, Gabriel Krisman Bertazi , linux-f2fs-devel@lists.sourceforge.net Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net From: Gabriel Krisman Bertazi Negative dentries support on case-insensitive ext4/f2fs will require access to the name under lookup to ensure it matches the dentry. This adds the information on d_revalidate and updates its implementation. This was done through a Coccinelle hook and tested by building with allyesconfig. Signed-off-by: Gabriel Krisman Bertazi --- Changes since v5: - Fix which qstr can change from under d_revalidate in documentation (Eric) Changes since v3: - Merge d_revalidate_name with d_revalidate (Christian) - Drop Ted's r-b since patch changed quite a bit. (Me) Changes since v2: - Document d_revalidate_name hook. (Eric) --- Documentation/filesystems/locking.rst | 3 ++- Documentation/filesystems/vfs.rst | 11 ++++++++++- fs/9p/vfs_dentry.c | 5 +++-- fs/afs/dir.c | 6 ++++-- fs/afs/dynroot.c | 4 +++- fs/ceph/dir.c | 3 ++- fs/coda/dir.c | 3 ++- fs/crypto/fname.c | 3 ++- fs/ecryptfs/dentry.c | 5 +++-- fs/exfat/namei.c | 3 ++- fs/fat/namei_vfat.c | 6 ++++-- fs/fuse/dir.c | 3 ++- fs/gfs2/dentry.c | 3 ++- fs/hfs/sysdep.c | 3 ++- fs/jfs/namei.c | 3 ++- fs/kernfs/dir.c | 3 ++- fs/namei.c | 18 ++++++++++-------- fs/nfs/dir.c | 9 ++++++--- fs/ocfs2/dcache.c | 4 +++- fs/orangefs/dcache.c | 3 ++- fs/overlayfs/super.c | 20 ++++++++++++-------- fs/proc/base.c | 6 ++++-- fs/proc/fd.c | 3 ++- fs/proc/generic.c | 6 ++++-- fs/proc/proc_sysctl.c | 3 ++- fs/reiserfs/xattr.c | 3 ++- fs/smb/client/dir.c | 3 ++- fs/vboxsf/dir.c | 4 +++- include/linux/dcache.h | 2 +- include/linux/fscrypt.h | 4 +++- 30 files changed, 103 insertions(+), 52 deletions(-) diff --git a/Documentation/filesystems/locking.rst b/Documentation/filesystems/locking.rst index ed148919e11a..1603c53a1688 100644 --- a/Documentation/filesystems/locking.rst +++ b/Documentation/filesystems/locking.rst @@ -17,7 +17,8 @@ dentry_operations prototypes:: - int (*d_revalidate)(struct dentry *, unsigned int); + int (*d_revalidate)(struct dentry *, const struct qstr *, + unsigned int); int (*d_weak_revalidate)(struct dentry *, unsigned int); int (*d_hash)(const struct dentry *, struct qstr *); int (*d_compare)(const struct dentry *, diff --git a/Documentation/filesystems/vfs.rst b/Documentation/filesystems/vfs.rst index cb2a97e49872..0727bb338182 100644 --- a/Documentation/filesystems/vfs.rst +++ b/Documentation/filesystems/vfs.rst @@ -1251,7 +1251,8 @@ defined: .. code-block:: c struct dentry_operations { - int (*d_revalidate)(struct dentry *, unsigned int); + int (*d_revalidate)(struct dentry *, const struct qstr *, + unsigned int); int (*d_weak_revalidate)(struct dentry *, unsigned int); int (*d_hash)(const struct dentry *, struct qstr *); int (*d_compare)(const struct dentry *, @@ -1284,6 +1285,14 @@ defined: they can change and, in d_inode case, even become NULL under us). + d_revalidate also provides the name-under-lookup for cases where + there are particular filename encoding semantics to be handled + during revalidation. Note that, if comparing with + dentry->d_name, the later can change from under d_revalidate, so + it must be protected with ->d_lock before accessing. The + exception is when revalidating negative dentries for creation, + in which case the parent inode prevents it from changing. + If a situation is encountered that rcu-walk cannot handle, return -ECHILD and it will be called again in ref-walk mode. diff --git a/fs/9p/vfs_dentry.c b/fs/9p/vfs_dentry.c index 0c6fa1f53530..de679d9505db 100644 --- a/fs/9p/vfs_dentry.c +++ b/fs/9p/vfs_dentry.c @@ -56,7 +56,8 @@ static void v9fs_dentry_release(struct dentry *dentry) dentry->d_fsdata = NULL; } -static int v9fs_lookup_revalidate(struct dentry *dentry, unsigned int flags) +static int v9fs_lookup_revalidate(struct dentry *dentry, + const struct qstr *name, unsigned int flags) { struct p9_fid *fid; struct inode *inode; @@ -97,7 +98,7 @@ static int v9fs_lookup_revalidate(struct dentry *dentry, unsigned int flags) static int v9fs_lookup_weak_revalidate(struct dentry *dentry, unsigned int flags) { - return v9fs_lookup_revalidate(dentry, flags); + return v9fs_lookup_revalidate(dentry, NULL, flags); } const struct dentry_operations v9fs_cached_dentry_operations = { diff --git a/fs/afs/dir.c b/fs/afs/dir.c index 5219182e52e1..e3ba14512715 100644 --- a/fs/afs/dir.c +++ b/fs/afs/dir.c @@ -21,7 +21,8 @@ static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags); static int afs_dir_open(struct inode *inode, struct file *file); static int afs_readdir(struct file *file, struct dir_context *ctx); -static int afs_d_revalidate(struct dentry *dentry, unsigned int flags); +static int afs_d_revalidate(struct dentry *dentry, const struct qstr *name, + unsigned int flags); static int afs_d_delete(const struct dentry *dentry); static void afs_d_iput(struct dentry *dentry, struct inode *inode); static bool afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen, @@ -1084,7 +1085,8 @@ static int afs_d_revalidate_rcu(struct dentry *dentry) * - NOTE! the hit can be a negative hit too, so we can't assume we have an * inode */ -static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) +static int afs_d_revalidate(struct dentry *dentry, const struct qstr *name, + unsigned int flags) { struct afs_vnode *vnode, *dir; struct afs_fid fid; diff --git a/fs/afs/dynroot.c b/fs/afs/dynroot.c index d7d9402ff718..44a8f736eaf8 100644 --- a/fs/afs/dynroot.c +++ b/fs/afs/dynroot.c @@ -247,7 +247,9 @@ const struct inode_operations afs_dynroot_inode_operations = { /* * Dirs in the dynamic root don't need revalidation. */ -static int afs_dynroot_d_revalidate(struct dentry *dentry, unsigned int flags) +static int afs_dynroot_d_revalidate(struct dentry *dentry, + const struct qstr *name, + unsigned int flags) { return 1; } diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c index 4a2b39d9a61a..dffc115adae0 100644 --- a/fs/ceph/dir.c +++ b/fs/ceph/dir.c @@ -1758,7 +1758,8 @@ static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry, /* * Check if cached dentry can be trusted. */ -static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags) +static int ceph_d_revalidate(struct dentry *dentry, const struct qstr *name, + unsigned int flags) { int valid = 0; struct dentry *parent; diff --git a/fs/coda/dir.c b/fs/coda/dir.c index 8450b1bd354b..bb2ecac4a7e7 100644 --- a/fs/coda/dir.c +++ b/fs/coda/dir.c @@ -452,7 +452,8 @@ static int coda_readdir(struct file *coda_file, struct dir_context *ctx) } /* called when a cache lookup succeeds */ -static int coda_dentry_revalidate(struct dentry *de, unsigned int flags) +static int coda_dentry_revalidate(struct dentry *de, const struct qstr *name, + unsigned int flags) { struct inode *inode; struct coda_inode_info *cii; diff --git a/fs/crypto/fname.c b/fs/crypto/fname.c index 6eae3f12ad50..d543e4648a0f 100644 --- a/fs/crypto/fname.c +++ b/fs/crypto/fname.c @@ -580,7 +580,8 @@ EXPORT_SYMBOL_GPL(fscrypt_fname_siphash); * Validate dentries in encrypted directories to make sure we aren't potentially * caching stale dentries after a key has been added. */ -int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags) +int fscrypt_d_revalidate(struct dentry *dentry, const struct qstr *name, + unsigned int flags) { struct dentry *dir; int err; diff --git a/fs/ecryptfs/dentry.c b/fs/ecryptfs/dentry.c index acaa0825e9bb..56093648d838 100644 --- a/fs/ecryptfs/dentry.c +++ b/fs/ecryptfs/dentry.c @@ -28,7 +28,8 @@ * Returns 1 if valid, 0 otherwise. * */ -static int ecryptfs_d_revalidate(struct dentry *dentry, unsigned int flags) +static int ecryptfs_d_revalidate(struct dentry *dentry, + const struct qstr *name, unsigned int flags) { struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); int rc = 1; @@ -37,7 +38,7 @@ static int ecryptfs_d_revalidate(struct dentry *dentry, unsigned int flags) return -ECHILD; if (lower_dentry->d_flags & DCACHE_OP_REVALIDATE) - rc = lower_dentry->d_op->d_revalidate(lower_dentry, flags); + rc = lower_dentry->d_op->d_revalidate(lower_dentry, name, flags); if (d_really_is_positive(dentry)) { struct inode *inode = d_inode(dentry); diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c index e0ff9d156f6f..6220046a687b 100644 --- a/fs/exfat/namei.c +++ b/fs/exfat/namei.c @@ -31,7 +31,8 @@ static inline void exfat_d_version_set(struct dentry *dentry, * If it happened, the negative dentry isn't actually negative anymore. So, * drop it. */ -static int exfat_d_revalidate(struct dentry *dentry, unsigned int flags) +static int exfat_d_revalidate(struct dentry *dentry, const struct qstr *name, + unsigned int flags) { int ret; diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c index c4d00999a433..73981b0e4ea7 100644 --- a/fs/fat/namei_vfat.c +++ b/fs/fat/namei_vfat.c @@ -53,7 +53,8 @@ static int vfat_revalidate_shortname(struct dentry *dentry) return ret; } -static int vfat_revalidate(struct dentry *dentry, unsigned int flags) +static int vfat_revalidate(struct dentry *dentry, const struct qstr *name, + unsigned int flags) { if (flags & LOOKUP_RCU) return -ECHILD; @@ -64,7 +65,8 @@ static int vfat_revalidate(struct dentry *dentry, unsigned int flags) return vfat_revalidate_shortname(dentry); } -static int vfat_revalidate_ci(struct dentry *dentry, unsigned int flags) +static int vfat_revalidate_ci(struct dentry *dentry, const struct qstr *name, + unsigned int flags) { if (flags & LOOKUP_RCU) return -ECHILD; diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index 35bc174f9ba2..948bbfc1aae4 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -202,7 +202,8 @@ static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_args *args, * the lookup once more. If the lookup results in the same inode, * then refresh the attributes, timeouts and mark the dentry valid. */ -static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags) +static int fuse_dentry_revalidate(struct dentry *entry, + const struct qstr *name, unsigned int flags) { struct inode *inode; struct dentry *parent; diff --git a/fs/gfs2/dentry.c b/fs/gfs2/dentry.c index 2e215e8c3c88..3dd93d36aaf2 100644 --- a/fs/gfs2/dentry.c +++ b/fs/gfs2/dentry.c @@ -30,7 +30,8 @@ * Returns: 1 if the dentry is ok, 0 if it isn't */ -static int gfs2_drevalidate(struct dentry *dentry, unsigned int flags) +static int gfs2_drevalidate(struct dentry *dentry, const struct qstr *name, + unsigned int flags) { struct dentry *parent; struct gfs2_sbd *sdp; diff --git a/fs/hfs/sysdep.c b/fs/hfs/sysdep.c index 2875961fdc10..68fb32f4fbb8 100644 --- a/fs/hfs/sysdep.c +++ b/fs/hfs/sysdep.c @@ -13,7 +13,8 @@ /* dentry case-handling: just lowercase everything */ -static int hfs_revalidate_dentry(struct dentry *dentry, unsigned int flags) +static int hfs_revalidate_dentry(struct dentry *dentry, + const struct qstr *name, unsigned int flags) { struct inode *inode; int diff; diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c index 9b030297aa64..0d2b5b54e2d8 100644 --- a/fs/jfs/namei.c +++ b/fs/jfs/namei.c @@ -1573,7 +1573,8 @@ static int jfs_ci_compare(const struct dentry *dentry, return result; } -static int jfs_ci_revalidate(struct dentry *dentry, unsigned int flags) +static int jfs_ci_revalidate(struct dentry *dentry, const struct qstr *name, + unsigned int flags) { /* * This is not negative dentry. Always valid. diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c index 5a1a4af9d3d2..820988710ce5 100644 --- a/fs/kernfs/dir.c +++ b/fs/kernfs/dir.c @@ -1084,7 +1084,8 @@ struct kernfs_node *kernfs_create_empty_dir(struct kernfs_node *parent, return ERR_PTR(rc); } -static int kernfs_dop_revalidate(struct dentry *dentry, unsigned int flags) +static int kernfs_dop_revalidate(struct dentry *dentry, + const struct qstr *name, unsigned int flags) { struct kernfs_node *kn; struct kernfs_root *root; diff --git a/fs/namei.c b/fs/namei.c index e56ff39a79bc..7631c762217a 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -853,10 +853,12 @@ static bool try_to_unlazy_next(struct nameidata *nd, struct dentry *dentry) return false; } -static inline int d_revalidate(struct dentry *dentry, unsigned int flags) +static inline int d_revalidate(struct dentry *dentry, + const struct qstr *name, + unsigned int flags) { if (unlikely(dentry->d_flags & DCACHE_OP_REVALIDATE)) - return dentry->d_op->d_revalidate(dentry, flags); + return dentry->d_op->d_revalidate(dentry, name, flags); else return 1; } @@ -1565,7 +1567,7 @@ static struct dentry *lookup_dcache(const struct qstr *name, { struct dentry *dentry = d_lookup(dir, name); if (dentry) { - int error = d_revalidate(dentry, flags); + int error = d_revalidate(dentry, name, flags); if (unlikely(error <= 0)) { if (!error) d_invalidate(dentry); @@ -1636,19 +1638,19 @@ static struct dentry *lookup_fast(struct nameidata *nd) if (read_seqcount_retry(&parent->d_seq, nd->seq)) return ERR_PTR(-ECHILD); - status = d_revalidate(dentry, nd->flags); + status = d_revalidate(dentry, &nd->last, nd->flags); if (likely(status > 0)) return dentry; if (!try_to_unlazy_next(nd, dentry)) return ERR_PTR(-ECHILD); if (status == -ECHILD) /* we'd been told to redo it in non-rcu mode */ - status = d_revalidate(dentry, nd->flags); + status = d_revalidate(dentry, &nd->last, nd->flags); } else { dentry = __d_lookup(parent, &nd->last); if (unlikely(!dentry)) return NULL; - status = d_revalidate(dentry, nd->flags); + status = d_revalidate(dentry, &nd->last, nd->flags); } if (unlikely(status <= 0)) { if (!status) @@ -1676,7 +1678,7 @@ static struct dentry *__lookup_slow(const struct qstr *name, if (IS_ERR(dentry)) return dentry; if (unlikely(!d_in_lookup(dentry))) { - int error = d_revalidate(dentry, flags); + int error = d_revalidate(dentry, name, flags); if (unlikely(error <= 0)) { if (!error) { d_invalidate(dentry); @@ -3421,7 +3423,7 @@ static struct dentry *lookup_open(struct nameidata *nd, struct file *file, if (d_in_lookup(dentry)) break; - error = d_revalidate(dentry, nd->flags); + error = d_revalidate(dentry, &nd->last, nd->flags); if (likely(error > 0)) break; if (error) diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index 8f3112e71a6a..be162ef6a24e 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -1805,7 +1805,8 @@ __nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags, return ret; } -static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags) +static int nfs_lookup_revalidate(struct dentry *dentry, + const struct qstr *name, unsigned int flags) { return __nfs_lookup_revalidate(dentry, flags, nfs_do_lookup_revalidate); } @@ -1993,7 +1994,8 @@ void nfs_d_prune_case_insensitive_aliases(struct inode *inode) EXPORT_SYMBOL_GPL(nfs_d_prune_case_insensitive_aliases); #if IS_ENABLED(CONFIG_NFS_V4) -static int nfs4_lookup_revalidate(struct dentry *, unsigned int); +static int nfs4_lookup_revalidate(struct dentry *, const struct qstr *name, + unsigned int); const struct dentry_operations nfs4_dentry_operations = { .d_revalidate = nfs4_lookup_revalidate, @@ -2226,7 +2228,8 @@ nfs4_do_lookup_revalidate(struct inode *dir, struct dentry *dentry, return nfs_do_lookup_revalidate(dir, dentry, flags); } -static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags) +static int nfs4_lookup_revalidate(struct dentry *dentry, + const struct qstr *name, unsigned int flags) { return __nfs_lookup_revalidate(dentry, flags, nfs4_do_lookup_revalidate); diff --git a/fs/ocfs2/dcache.c b/fs/ocfs2/dcache.c index 04fc8344063a..277757f4fd2d 100644 --- a/fs/ocfs2/dcache.c +++ b/fs/ocfs2/dcache.c @@ -32,7 +32,9 @@ void ocfs2_dentry_attach_gen(struct dentry *dentry) } -static int ocfs2_dentry_revalidate(struct dentry *dentry, unsigned int flags) +static int ocfs2_dentry_revalidate(struct dentry *dentry, + const struct qstr *name, + unsigned int flags) { struct inode *inode; int ret = 0; /* if all else fails, just return false */ diff --git a/fs/orangefs/dcache.c b/fs/orangefs/dcache.c index 8bbe9486e3a6..435b88007809 100644 --- a/fs/orangefs/dcache.c +++ b/fs/orangefs/dcache.c @@ -94,7 +94,8 @@ static int orangefs_revalidate_lookup(struct dentry *dentry) * * Should return 1 if dentry can still be trusted, else 0. */ -static int orangefs_d_revalidate(struct dentry *dentry, unsigned int flags) +static int orangefs_d_revalidate(struct dentry *dentry, + const struct qstr *name, unsigned int flags) { int ret; unsigned long time = (unsigned long) dentry->d_fsdata; diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index 5b069f1a1e44..1233e38d029d 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -77,7 +77,8 @@ static struct dentry *ovl_d_real(struct dentry *dentry, return dentry; } -static int ovl_revalidate_real(struct dentry *d, unsigned int flags, bool weak) +static int ovl_revalidate_real(struct dentry *d, const struct qstr *name, + unsigned int flags, bool weak) { int ret = 1; @@ -88,7 +89,7 @@ static int ovl_revalidate_real(struct dentry *d, unsigned int flags, bool weak) if (d->d_flags & DCACHE_OP_WEAK_REVALIDATE) ret = d->d_op->d_weak_revalidate(d, flags); } else if (d->d_flags & DCACHE_OP_REVALIDATE) { - ret = d->d_op->d_revalidate(d, flags); + ret = d->d_op->d_revalidate(d, name, flags); if (!ret) { if (!(flags & LOOKUP_RCU)) d_invalidate(d); @@ -99,6 +100,7 @@ static int ovl_revalidate_real(struct dentry *d, unsigned int flags, bool weak) } static int ovl_dentry_revalidate_common(struct dentry *dentry, + const struct qstr *name, unsigned int flags, bool weak) { struct ovl_entry *oe = OVL_E(dentry); @@ -114,22 +116,24 @@ static int ovl_dentry_revalidate_common(struct dentry *dentry, upper = ovl_i_dentry_upper(inode); if (upper) - ret = ovl_revalidate_real(upper, flags, weak); + ret = ovl_revalidate_real(upper, name, flags, weak); for (i = 0; ret > 0 && i < ovl_numlower(oe); i++) - ret = ovl_revalidate_real(lowerstack[i].dentry, flags, weak); + ret = ovl_revalidate_real(lowerstack[i].dentry, name, flags, weak); return ret; } -static int ovl_dentry_revalidate(struct dentry *dentry, unsigned int flags) +static int ovl_dentry_revalidate(struct dentry *dentry, + const struct qstr *name, unsigned int flags) { - return ovl_dentry_revalidate_common(dentry, flags, false); + return ovl_dentry_revalidate_common(dentry, name, flags, false); } -static int ovl_dentry_weak_revalidate(struct dentry *dentry, unsigned int flags) +static int ovl_dentry_weak_revalidate(struct dentry *dentry, + unsigned int flags) { - return ovl_dentry_revalidate_common(dentry, flags, true); + return ovl_dentry_revalidate_common(dentry, NULL, flags, true); } static const struct dentry_operations ovl_dentry_operations = { diff --git a/fs/proc/base.c b/fs/proc/base.c index 05452c3b9872..bdf212c52c8f 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -2005,7 +2005,8 @@ void pid_update_inode(struct task_struct *task, struct inode *inode) * performed a setuid(), etc. * */ -static int pid_revalidate(struct dentry *dentry, unsigned int flags) +static int pid_revalidate(struct dentry *dentry, const struct qstr *name, + unsigned int flags) { struct inode *inode; struct task_struct *task; @@ -2138,7 +2139,8 @@ static int dname_to_vma_addr(struct dentry *dentry, return 0; } -static int map_files_d_revalidate(struct dentry *dentry, unsigned int flags) +static int map_files_d_revalidate(struct dentry *dentry, + const struct qstr *name, unsigned int flags) { unsigned long vm_start, vm_end; bool exact_vma_exists = false; diff --git a/fs/proc/fd.c b/fs/proc/fd.c index b3140deebbbf..efd604fe8d82 100644 --- a/fs/proc/fd.c +++ b/fs/proc/fd.c @@ -136,7 +136,8 @@ static void tid_fd_update_inode(struct task_struct *task, struct inode *inode, security_task_to_inode(task, inode); } -static int tid_fd_revalidate(struct dentry *dentry, unsigned int flags) +static int tid_fd_revalidate(struct dentry *dentry, const struct qstr *name, + unsigned int flags) { struct task_struct *task; struct inode *inode; diff --git a/fs/proc/generic.c b/fs/proc/generic.c index 42ae38ff6e7e..7cb15ab01a5a 100644 --- a/fs/proc/generic.c +++ b/fs/proc/generic.c @@ -216,7 +216,8 @@ void proc_free_inum(unsigned int inum) ida_simple_remove(&proc_inum_ida, inum - PROC_DYNAMIC_FIRST); } -static int proc_misc_d_revalidate(struct dentry *dentry, unsigned int flags) +static int proc_misc_d_revalidate(struct dentry *dentry, + const struct qstr *name, unsigned int flags) { if (flags & LOOKUP_RCU) return -ECHILD; @@ -343,7 +344,8 @@ static const struct file_operations proc_dir_operations = { .iterate_shared = proc_readdir, }; -static int proc_net_d_revalidate(struct dentry *dentry, unsigned int flags) +static int proc_net_d_revalidate(struct dentry *dentry, + const struct qstr *name, unsigned int flags) { return 0; } diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c index 5ea42653126e..d067ebff1c74 100644 --- a/fs/proc/proc_sysctl.c +++ b/fs/proc/proc_sysctl.c @@ -886,7 +886,8 @@ static const struct inode_operations proc_sys_dir_operations = { .getattr = proc_sys_getattr, }; -static int proc_sys_revalidate(struct dentry *dentry, unsigned int flags) +static int proc_sys_revalidate(struct dentry *dentry, const struct qstr *name, + unsigned int flags) { if (flags & LOOKUP_RCU) return -ECHILD; diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c index 651027967159..2d09e4cdedd1 100644 --- a/fs/reiserfs/xattr.c +++ b/fs/reiserfs/xattr.c @@ -957,7 +957,8 @@ int reiserfs_permission(struct mnt_idmap *idmap, struct inode *inode, return generic_permission(&nop_mnt_idmap, inode, mask); } -static int xattr_hide_revalidate(struct dentry *dentry, unsigned int flags) +static int xattr_hide_revalidate(struct dentry *dentry, + const struct qstr *name, unsigned int flags) { return -EPERM; } diff --git a/fs/smb/client/dir.c b/fs/smb/client/dir.c index 30b1e1bfd204..0ced1a98de9f 100644 --- a/fs/smb/client/dir.c +++ b/fs/smb/client/dir.c @@ -714,7 +714,8 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, } static int -cifs_d_revalidate(struct dentry *direntry, unsigned int flags) +cifs_d_revalidate(struct dentry *direntry, const struct qstr *name, + unsigned int flags) { struct inode *inode; int rc; diff --git a/fs/vboxsf/dir.c b/fs/vboxsf/dir.c index 075f15c43c78..81a03a7331a4 100644 --- a/fs/vboxsf/dir.c +++ b/fs/vboxsf/dir.c @@ -191,7 +191,9 @@ const struct file_operations vboxsf_dir_fops = { * This is called during name resolution/lookup to check if the @dentry in * the cache is still valid. the job is handled by vboxsf_inode_revalidate. */ -static int vboxsf_dentry_revalidate(struct dentry *dentry, unsigned int flags) +static int vboxsf_dentry_revalidate(struct dentry *dentry, + const struct qstr *name, + unsigned int flags) { if (flags & LOOKUP_RCU) return -ECHILD; diff --git a/include/linux/dcache.h b/include/linux/dcache.h index 6b351e009f59..9362e4ef0bad 100644 --- a/include/linux/dcache.h +++ b/include/linux/dcache.h @@ -126,7 +126,7 @@ enum dentry_d_lock_class }; struct dentry_operations { - int (*d_revalidate)(struct dentry *, unsigned int); + int (*d_revalidate)(struct dentry *, const struct qstr *, unsigned int); int (*d_weak_revalidate)(struct dentry *, unsigned int); int (*d_hash)(const struct dentry *, struct qstr *); int (*d_compare)(const struct dentry *, diff --git a/include/linux/fscrypt.h b/include/linux/fscrypt.h index c895b12737a1..d8c68a366a2b 100644 --- a/include/linux/fscrypt.h +++ b/include/linux/fscrypt.h @@ -353,7 +353,8 @@ int fscrypt_fname_disk_to_usr(const struct inode *inode, bool fscrypt_match_name(const struct fscrypt_name *fname, const u8 *de_name, u32 de_name_len); u64 fscrypt_fname_siphash(const struct inode *dir, const struct qstr *name); -int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags); +int fscrypt_d_revalidate(struct dentry *dentry, const struct qstr *name, + unsigned int flags); /* bio.c */ bool fscrypt_decrypt_bio(struct bio *bio); @@ -647,6 +648,7 @@ static inline u64 fscrypt_fname_siphash(const struct inode *dir, } static inline int fscrypt_d_revalidate(struct dentry *dentry, + const struct qstr *name, unsigned int flags) { return 1; From patchwork Wed Aug 16 05:07:58 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gabriel Krisman Bertazi X-Patchwork-Id: 13354567 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.sourceforge.net (lists.sourceforge.net [216.105.38.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id BA2ABC04A94 for ; Wed, 16 Aug 2023 05:08:26 +0000 (UTC) Received: from [127.0.0.1] (helo=sfs-ml-4.v29.lw.sourceforge.com) by sfs-ml-4.v29.lw.sourceforge.com with esmtp (Exim 4.95) (envelope-from ) id 1qW8ld-0004rG-HQ; 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Wed, 16 Aug 2023 05:08:14 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id hflUBL5Z3GTkTgAAMHmgww (envelope-from ); Wed, 16 Aug 2023 05:08:14 +0000 From: Gabriel Krisman Bertazi To: viro@zeniv.linux.org.uk, brauner@kernel.org, tytso@mit.edu, ebiggers@kernel.org, jaegeuk@kernel.org Date: Wed, 16 Aug 2023 01:07:58 -0400 Message-ID: <20230816050803.15660-5-krisman@suse.de> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230816050803.15660-1-krisman@suse.de> References: <20230816050803.15660-1-krisman@suse.de> MIME-Version: 1.0 X-Headers-End: 1qW8lY-006njN-Iz Subject: [f2fs-dev] [PATCH v6 4/9] fs: Add DCACHE_CASEFOLDED_NAME flag X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-fsdevel@vger.kernel.org, Gabriel Krisman Bertazi , linux-ext4@vger.kernel.org, Gabriel Krisman Bertazi , linux-f2fs-devel@lists.sourceforge.net Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net From: Gabriel Krisman Bertazi This flag marks a negative or positive dentry as being created after a case-insensitive lookup operation. It is useful to differentiate dentries this way to detect whether the negative dentry can be trusted during a case-insensitive lookup. Reviewed-by: Theodore Ts'o Signed-off-by: Gabriel Krisman Bertazi --- Changes since v5: - Fix EXPORT_SYMBOL (Eric, kernel test bot) Changes since v4: - Fixup names of functions to reflect flag name change (Eric) Changes since v2: - Rename DCACHE_CASEFOLD_LOOKUP -> DCACHE_CASEFOLDED_NAME (Eric) --- fs/dcache.c | 8 ++++++++ include/linux/dcache.h | 8 ++++++++ 2 files changed, 16 insertions(+) diff --git a/fs/dcache.c b/fs/dcache.c index 52e6d5fdab6b..91e5cd4c4237 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -1958,6 +1958,14 @@ void d_set_fallthru(struct dentry *dentry) } EXPORT_SYMBOL(d_set_fallthru); +void d_set_casefolded_name(struct dentry *dentry) +{ + spin_lock(&dentry->d_lock); + dentry->d_flags |= DCACHE_CASEFOLDED_NAME; + spin_unlock(&dentry->d_lock); +} +EXPORT_SYMBOL(d_set_casefolded_name); + static unsigned d_flags_for_inode(struct inode *inode) { unsigned add_flags = DCACHE_REGULAR_TYPE; diff --git a/include/linux/dcache.h b/include/linux/dcache.h index 9362e4ef0bad..ccbb5c4db7ce 100644 --- a/include/linux/dcache.h +++ b/include/linux/dcache.h @@ -208,6 +208,7 @@ struct dentry_operations { #define DCACHE_FALLTHRU 0x01000000 /* Fall through to lower layer */ #define DCACHE_NOKEY_NAME 0x02000000 /* Encrypted name encoded without key */ #define DCACHE_OP_REAL 0x04000000 +#define DCACHE_CASEFOLDED_NAME 0x08000000 /* Dentry comes from a casefold directory */ #define DCACHE_PAR_LOOKUP 0x10000000 /* being looked up (with parent locked shared) */ #define DCACHE_DENTRY_CURSOR 0x20000000 @@ -496,6 +497,13 @@ static inline bool d_is_fallthru(const struct dentry *dentry) return dentry->d_flags & DCACHE_FALLTHRU; } +extern void d_set_casefolded_name(struct dentry *dentry); + +static inline bool d_is_casefolded_name(const struct dentry *dentry) +{ + return dentry->d_flags & DCACHE_CASEFOLDED_NAME; +} + extern int sysctl_vfs_cache_pressure; From patchwork Wed Aug 16 05:07:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gabriel Krisman Bertazi X-Patchwork-Id: 13354568 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.sourceforge.net (lists.sourceforge.net [216.105.38.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 34BB0C001E0 for ; Wed, 16 Aug 2023 05:08:28 +0000 (UTC) Received: from [127.0.0.1] (helo=sfs-ml-2.v29.lw.sourceforge.com) by sfs-ml-2.v29.lw.sourceforge.com with esmtp (Exim 4.95) (envelope-from ) id 1qW8lg-0007m3-Bc; Wed, 16 Aug 2023 05:08:27 +0000 Received: from [172.30.20.202] (helo=mx.sourceforge.net) by sfs-ml-2.v29.lw.sourceforge.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1qW8lf-0007ls-4k for linux-f2fs-devel@lists.sourceforge.net; 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Wed, 16 Aug 2023 05:08:15 +0000 From: Gabriel Krisman Bertazi To: viro@zeniv.linux.org.uk, brauner@kernel.org, tytso@mit.edu, ebiggers@kernel.org, jaegeuk@kernel.org Date: Wed, 16 Aug 2023 01:07:59 -0400 Message-ID: <20230816050803.15660-6-krisman@suse.de> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230816050803.15660-1-krisman@suse.de> References: <20230816050803.15660-1-krisman@suse.de> MIME-Version: 1.0 X-Headers-End: 1qW8la-006njO-2b Subject: [f2fs-dev] [PATCH v6 5/9] libfs: Validate negative dentries in case-insensitive directories X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-fsdevel@vger.kernel.org, Gabriel Krisman Bertazi , linux-ext4@vger.kernel.org, Gabriel Krisman Bertazi , linux-f2fs-devel@lists.sourceforge.net Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net From: Gabriel Krisman Bertazi Introduce a dentry revalidation helper to check the negative dentries of case-insensitive filesystems. This helper is based on the fact that a negative dentry might safe to be reused on a casefolded directory if it was created during a case-insensitive lookup, because that kind of lookup verifies not only the exact name doesn't exist in a directory, but also that *any* case-equivalent name also doesn't exist. The sole exception is during file creation, in which case we also need to make sure the name matches case-sensitively, in order to assure the disk name-preserving semantics. We cover most creations by checking LOOKUP_CREATE|LOOKUP_RENAME_TARGET flags. But, while most creations use those flags, there are filesystem helpers that call lookup for creation with flags==0. Since we can't know whether those are for creation, just reject the negative dentries if there are no flags to check. Note that we avoid taking the ->d_lock while accessing ->d_name, because it isn't really necessary for the LOOKUP_CREATE/LOOKUP_RENAME_TARGET case. That is because in every creation path with these flags, we know the parent inode lock is acquired, at least for reading, thus stabilizing the d_name, since it prevents the dentry from being instantiated and negative dentries cannot be moved. See also the comment in the code. * Discussion on the ->d_name stability d_revalidate can only be reached from 4 code paths: lookup_dcache, __lookup_slow, lookup_open and lookup_fast: - lookup_dcache only reaches d_revalidate with creation flags when coming from __lookup_hash, which needs the parent locked already. - In __lookup_slow, either the parent inode is read-locked by the caller (lookup_slow), or it is called with no flags (lookup_one*). A read lock suffices to prevent concurrent ->d_name modifications, with the exception of a modification inside __d_unalias, which is not a problem because negative dentries are not allowed to be moved with __d_move. In addition, d_instantiate shouldn't race with this case because its callers also acquire the parent inode lock, preventing it from racing with lookup creation. - lookup_open also requires the parent to be locked in the creation case, which is done in open_last_lookups. - lookup_fast will indeed be called with the parent unlocked, but it shouldn never be called with LOOKUP_CREATE. Either it is called in the link_path_walk, where nd->flags doesn't have LOOKUP_CREATE yet or in open_last_lookups. But, in this case, it also never has LOOKUP_CREATE, because it is only called on the !O_CREAT case, which means op->intent doesn't have LOOKUP_CREAT (set in build_open_flags only if O_CREAT is set). In addition, for the LOOKUP_RENAME_TARGET, we are doing a rename, so the parents inodes are also locked. Reviewed-by: Theodore Ts'o Signed-off-by: Gabriel Krisman Bertazi --- Changes since v5: - Use IS_CASEFOLDED directly (Eric) - Reword commit message and comment in the code (Eric) Changes since v4: - Drop useless inline declaration (eric) - Refactor to drop extra identation (Christian) - Discuss d_instantiate Changes since v3: - Add comment regarding creation (Eric) - Reorder checks to clarify !flags meaning (Eric) - Add commit message explanaton of the inode read lock wrt. __d_move. (Eric) Changes since v2: - Add comments to all rejection cases (Eric) - safeguard against filesystem creating dentries without LOOKUP flags --- fs/libfs.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) diff --git a/fs/libfs.c b/fs/libfs.c index 5b851315eeed..26bf1b832b0a 100644 --- a/fs/libfs.c +++ b/fs/libfs.c @@ -1462,9 +1462,63 @@ static int generic_ci_d_hash(const struct dentry *dentry, struct qstr *str) return 0; } +static int generic_ci_d_revalidate(struct dentry *dentry, + const struct qstr *name, + unsigned int flags) +{ + const struct dentry *parent; + const struct inode *dir; + + if (!d_is_negative(dentry)) + return 1; + + parent = READ_ONCE(dentry->d_parent); + dir = READ_ONCE(parent->d_inode); + + if (!dir || !IS_CASEFOLDED(dir)) + return 1; + + /* + * Negative dentries created prior to turning the directory + * case-insensitive cannot be trusted, since they don't ensure + * any possible case version of the filename doesn't exist. + */ + if (!d_is_casefolded_name(dentry)) + return 0; + + /* + * If the lookup is for creation, then a negative dentry can only be + * reused if it's a case-sensitive match, not just a case-insensitive + * one. This is needed to make the new file be created with the name + * the user specified, preserving case. + * + * LOOKUP_CREATE or LOOKUP_RENAME_TARGET cover most creations. In these + * cases, ->d_name is stable and can be compared to 'name' without + * taking ->d_lock because the caller must hold dir->i_rwsem. (This + * is because the directory lock blocks the dentry from being + * concurrently instantiated, and negative dentries are never moved.) + * + * All other creations actually use flags==0. These come from the edge + * case of filesystems calling functions like lookup_one() that do a + * lookup without setting the lookup flags at all. Such lookups might + * or might not be for creation, and if not don't guarantee stable + * ->d_name. Therefore, invalidate all negative dentries when flags==0. + */ + if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) { + if (dentry->d_name.len != name->len || + memcmp(dentry->d_name.name, name->name, name->len)) + return 0; + } else if (!flags) { + return 0; + } + + return 1; +} + static const struct dentry_operations generic_ci_dentry_ops = { .d_hash = generic_ci_d_hash, .d_compare = generic_ci_d_compare, + .d_revalidate = generic_ci_d_revalidate, }; #endif From patchwork Wed Aug 16 05:08:00 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gabriel Krisman Bertazi X-Patchwork-Id: 13354572 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.sourceforge.net (lists.sourceforge.net [216.105.38.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EF620C001E0 for ; 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Wed, 16 Aug 2023 05:08:17 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id shOlBMFZ3GQBTwAAMHmgww (envelope-from ); Wed, 16 Aug 2023 05:08:17 +0000 From: Gabriel Krisman Bertazi To: viro@zeniv.linux.org.uk, brauner@kernel.org, tytso@mit.edu, ebiggers@kernel.org, jaegeuk@kernel.org Date: Wed, 16 Aug 2023 01:08:00 -0400 Message-ID: <20230816050803.15660-7-krisman@suse.de> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230816050803.15660-1-krisman@suse.de> References: <20230816050803.15660-1-krisman@suse.de> MIME-Version: 1.0 X-Headers-End: 1qW8lb-0004zd-Ml Subject: [f2fs-dev] [PATCH v6 6/9] libfs: Chain encryption checks after case-insensitive revalidation X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-fsdevel@vger.kernel.org, Gabriel Krisman Bertazi , linux-ext4@vger.kernel.org, Gabriel Krisman Bertazi , linux-f2fs-devel@lists.sourceforge.net Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net From: Gabriel Krisman Bertazi Support encrypted dentries in generic_ci_d_revalidate by chaining fscrypt_d_revalidate at the tail of the d_revalidate. This allows filesystem to just call generic_ci_d_revalidate and let it handle any case-insensitive dentry (encrypted or not). Signed-off-by: Gabriel Krisman Bertazi --- Changes since v2: - Enable negative dentries of encrypted filesystems (Eric) --- fs/libfs.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/fs/libfs.c b/fs/libfs.c index 26bf1b832b0a..994e4c98ec07 100644 --- a/fs/libfs.c +++ b/fs/libfs.c @@ -1462,9 +1462,8 @@ static int generic_ci_d_hash(const struct dentry *dentry, struct qstr *str) return 0; } -static int generic_ci_d_revalidate(struct dentry *dentry, - const struct qstr *name, - unsigned int flags) +static int ci_d_revalidate(struct dentry *dentry, const struct qstr *name, + unsigned int flags) { const struct dentry *parent; const struct inode *dir; @@ -1515,6 +1514,15 @@ static int generic_ci_d_revalidate(struct dentry *dentry, return 1; } +static int generic_ci_d_revalidate(struct dentry *dentry, + const struct qstr *name, + unsigned int flags) +{ + if (!ci_d_revalidate(dentry, name, flags)) + return 0; + return fscrypt_d_revalidate(dentry, name, flags); +} + static const struct dentry_operations generic_ci_dentry_ops = { .d_hash = generic_ci_d_hash, .d_compare = generic_ci_d_compare, @@ -1532,7 +1540,7 @@ static const struct dentry_operations generic_encrypted_dentry_ops = { static const struct dentry_operations generic_encrypted_ci_dentry_ops = { .d_hash = generic_ci_d_hash, .d_compare = generic_ci_d_compare, - .d_revalidate = fscrypt_d_revalidate, + .d_revalidate = generic_ci_d_revalidate, }; #endif From patchwork Wed Aug 16 05:08:01 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gabriel Krisman Bertazi X-Patchwork-Id: 13354569 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.sourceforge.net (lists.sourceforge.net [216.105.38.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6AE97C04FDF for ; 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Wed, 16 Aug 2023 05:08:18 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id 6J9KI8JZ3GQFTwAAMHmgww (envelope-from ); Wed, 16 Aug 2023 05:08:18 +0000 From: Gabriel Krisman Bertazi To: viro@zeniv.linux.org.uk, brauner@kernel.org, tytso@mit.edu, ebiggers@kernel.org, jaegeuk@kernel.org Date: Wed, 16 Aug 2023 01:08:01 -0400 Message-ID: <20230816050803.15660-8-krisman@suse.de> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230816050803.15660-1-krisman@suse.de> References: <20230816050803.15660-1-krisman@suse.de> MIME-Version: 1.0 X-Headers-End: 1qW8ld-006njT-3L Subject: [f2fs-dev] [PATCH v6 7/9] libfs: Merge encrypted_ci_dentry_ops and ci_dentry_ops X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-fsdevel@vger.kernel.org, Gabriel Krisman Bertazi , linux-ext4@vger.kernel.org, Gabriel Krisman Bertazi , linux-f2fs-devel@lists.sourceforge.net Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net From: Gabriel Krisman Bertazi Now that casefold needs d_revalidate and calls fscrypt_d_revalidate itself, generic_encrypt_ci_dentry_ops and generic_ci_dentry_ops are now equivalent. Merge them together and simplify the setup code. Signed-off-by: Gabriel Krisman Bertazi --- changes since v2: - reword comment for clarity (Eric) --- fs/libfs.c | 45 +++++++++++++-------------------------------- 1 file changed, 13 insertions(+), 32 deletions(-) diff --git a/fs/libfs.c b/fs/libfs.c index 994e4c98ec07..e7a44a2be0ee 100644 --- a/fs/libfs.c +++ b/fs/libfs.c @@ -1523,7 +1523,7 @@ static int generic_ci_d_revalidate(struct dentry *dentry, return fscrypt_d_revalidate(dentry, name, flags); } -static const struct dentry_operations generic_ci_dentry_ops = { +static const struct dentry_operations generic_encrypted_ci_dentry_ops = { .d_hash = generic_ci_d_hash, .d_compare = generic_ci_d_compare, .d_revalidate = generic_ci_d_revalidate, @@ -1536,26 +1536,19 @@ static const struct dentry_operations generic_encrypted_dentry_ops = { }; #endif -#if defined(CONFIG_FS_ENCRYPTION) && IS_ENABLED(CONFIG_UNICODE) -static const struct dentry_operations generic_encrypted_ci_dentry_ops = { - .d_hash = generic_ci_d_hash, - .d_compare = generic_ci_d_compare, - .d_revalidate = generic_ci_d_revalidate, -}; -#endif - /** * generic_set_encrypted_ci_d_ops - helper for setting d_ops for given dentry * @dentry: dentry to set ops on * - * Casefolded directories need d_hash and d_compare set, so that the dentries - * contained in them are handled case-insensitively. Note that these operations - * are needed on the parent directory rather than on the dentries in it, and - * while the casefolding flag can be toggled on and off on an empty directory, - * dentry_operations can't be changed later. As a result, if the filesystem has - * casefolding support enabled at all, we have to give all dentries the - * casefolding operations even if their inode doesn't have the casefolding flag - * currently (and thus the casefolding ops would be no-ops for now). + * Casefolded directories need some dentry_operations set, so that the dentries + * contained in them are handled case-insensitively. Note that d_hash and + * d_compare are needed on the parent directory rather than on the dentries in + * it, and while the casefolding flag can be toggled on and off on an empty + * directory, dentry_operations can't be changed later. As a result, if the + * filesystem has casefolding support enabled at all, we have to give all + * dentries the casefolding operations even if their inode doesn't have the + * casefolding flag currently (and thus the casefolding ops would be no-ops for + * now). * * Encryption works differently in that the only dentry operation it needs is * d_revalidate, which it only needs on dentries that have the no-key name flag. @@ -1564,34 +1557,22 @@ static const struct dentry_operations generic_encrypted_ci_dentry_ops = { * Finally, to maximize compatibility with overlayfs (which isn't compatible * with certain dentry operations) and to avoid taking an unnecessary * performance hit, we use custom dentry_operations for each possible - * combination rather than always installing all operations. + * combination of operations rather than always installing them. */ void generic_set_encrypted_ci_d_ops(struct dentry *dentry) { -#ifdef CONFIG_FS_ENCRYPTION - bool needs_encrypt_ops = dentry->d_flags & DCACHE_NOKEY_NAME; -#endif #if IS_ENABLED(CONFIG_UNICODE) - bool needs_ci_ops = dentry->d_sb->s_encoding; -#endif -#if defined(CONFIG_FS_ENCRYPTION) && IS_ENABLED(CONFIG_UNICODE) - if (needs_encrypt_ops && needs_ci_ops) { + if (dentry->d_sb->s_encoding) { d_set_d_op(dentry, &generic_encrypted_ci_dentry_ops); return; } #endif #ifdef CONFIG_FS_ENCRYPTION - if (needs_encrypt_ops) { + if (dentry->d_flags & DCACHE_NOKEY_NAME) { d_set_d_op(dentry, &generic_encrypted_dentry_ops); return; } #endif -#if IS_ENABLED(CONFIG_UNICODE) - if (needs_ci_ops) { - d_set_d_op(dentry, &generic_ci_dentry_ops); - return; - } -#endif } EXPORT_SYMBOL(generic_set_encrypted_ci_d_ops); From patchwork Wed Aug 16 05:08:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gabriel Krisman Bertazi X-Patchwork-Id: 13354571 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.sourceforge.net (lists.sourceforge.net [216.105.38.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 78D27C04A94 for ; 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Wed, 16 Aug 2023 05:08:20 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id mgJWBsRZ3GQNTwAAMHmgww (envelope-from ); Wed, 16 Aug 2023 05:08:20 +0000 From: Gabriel Krisman Bertazi To: viro@zeniv.linux.org.uk, brauner@kernel.org, tytso@mit.edu, ebiggers@kernel.org, jaegeuk@kernel.org Date: Wed, 16 Aug 2023 01:08:02 -0400 Message-ID: <20230816050803.15660-9-krisman@suse.de> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230816050803.15660-1-krisman@suse.de> References: <20230816050803.15660-1-krisman@suse.de> MIME-Version: 1.0 X-Headers-End: 1qW8le-006njd-Kg Subject: [f2fs-dev] [PATCH v6 8/9] ext4: Enable negative dentries on case-insensitive lookup X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-fsdevel@vger.kernel.org, Gabriel Krisman Bertazi , linux-ext4@vger.kernel.org, Gabriel Krisman Bertazi , linux-f2fs-devel@lists.sourceforge.net Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net From: Gabriel Krisman Bertazi Instead of invalidating negative dentries during case-insensitive lookups, mark them as such and let them be added to the dcache. d_ci_revalidate is able to properly filter them out if necessary based on the dentry casefold flag. Signed-off-by: Gabriel Krisman Bertazi --- Changes since v5: - Use IS_CASEFOLDED directly (Eric) Changes since v4: - Use helper to decide if should set dentry flag. Changes since v2: - Move dentry flag set closer to fscrypt code (Eric) --- fs/ext4/namei.c | 35 ++++------------------------------- 1 file changed, 4 insertions(+), 31 deletions(-) diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index 0caf6c730ce3..d8a1c59eeae1 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -1759,6 +1759,10 @@ static struct buffer_head *ext4_lookup_entry(struct inode *dir, err = ext4_fname_prepare_lookup(dir, dentry, &fname); generic_set_encrypted_ci_d_ops(dentry); + + if (IS_CASEFOLDED(dir)) + d_set_casefolded_name(dentry); + if (err == -ENOENT) return NULL; if (err) @@ -1866,16 +1870,6 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsi } } -#if IS_ENABLED(CONFIG_UNICODE) - if (!inode && IS_CASEFOLDED(dir)) { - /* Eventually we want to call d_add_ci(dentry, NULL) - * for negative dentries in the encoding case as - * well. For now, prevent the negative dentry - * from being cached. - */ - return NULL; - } -#endif return d_splice_alias(inode, dentry); } @@ -3206,17 +3200,6 @@ static int ext4_rmdir(struct inode *dir, struct dentry *dentry) ext4_fc_track_unlink(handle, dentry); retval = ext4_mark_inode_dirty(handle, dir); -#if IS_ENABLED(CONFIG_UNICODE) - /* VFS negative dentries are incompatible with Encoding and - * Case-insensitiveness. Eventually we'll want avoid - * invalidating the dentries here, alongside with returning the - * negative dentries at ext4_lookup(), when it is better - * supported by the VFS for the CI case. - */ - if (IS_CASEFOLDED(dir)) - d_invalidate(dentry); -#endif - end_rmdir: brelse(bh); if (handle) @@ -3317,16 +3300,6 @@ static int ext4_unlink(struct inode *dir, struct dentry *dentry) goto out_trace; retval = __ext4_unlink(dir, &dentry->d_name, d_inode(dentry), dentry); -#if IS_ENABLED(CONFIG_UNICODE) - /* VFS negative dentries are incompatible with Encoding and - * Case-insensitiveness. Eventually we'll want avoid - * invalidating the dentries here, alongside with returning the - * negative dentries at ext4_lookup(), when it is better - * supported by the VFS for the CI case. - */ - if (IS_CASEFOLDED(dir)) - d_invalidate(dentry); -#endif out_trace: trace_ext4_unlink_exit(dentry, retval); From patchwork Wed Aug 16 05:08:03 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gabriel Krisman Bertazi X-Patchwork-Id: 13354573 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.sourceforge.net (lists.sourceforge.net [216.105.38.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5379CC04FE0 for ; Wed, 16 Aug 2023 05:08:30 +0000 (UTC) Received: from [127.0.0.1] (helo=sfs-ml-3.v29.lw.sourceforge.com) by sfs-ml-3.v29.lw.sourceforge.com with esmtp (Exim 4.95) (envelope-from ) id 1qW8lh-0001rC-KW; 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Wed, 16 Aug 2023 05:08:21 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id iu43KMVZ3GQRTwAAMHmgww (envelope-from ); Wed, 16 Aug 2023 05:08:21 +0000 From: Gabriel Krisman Bertazi To: viro@zeniv.linux.org.uk, brauner@kernel.org, tytso@mit.edu, ebiggers@kernel.org, jaegeuk@kernel.org Date: Wed, 16 Aug 2023 01:08:03 -0400 Message-ID: <20230816050803.15660-10-krisman@suse.de> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230816050803.15660-1-krisman@suse.de> References: <20230816050803.15660-1-krisman@suse.de> MIME-Version: 1.0 X-Headers-End: 1qW8lg-0004zm-7Q Subject: [f2fs-dev] [PATCH v6 9/9] f2fs: Enable negative dentries on case-insensitive lookup X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-fsdevel@vger.kernel.org, Gabriel Krisman Bertazi , linux-ext4@vger.kernel.org, Gabriel Krisman Bertazi , linux-f2fs-devel@lists.sourceforge.net Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net From: Gabriel Krisman Bertazi Instead of invalidating negative dentries during case-insensitive lookups, mark them as such and let them be added to the dcache. d_ci_revalidate is able to properly filter them out if necessary based on the dentry casefold flag. Signed-off-by: Gabriel Krisman Bertazi --- Changes since v5: - Use IS_CASEFOLDED directly (eric) Changes since v4: - Use helper to decide if should set dentry flag. Changes since v2: - Move dentry flag set closer to fscrypt code (Eric) --- fs/f2fs/namei.c | 25 ++++--------------------- 1 file changed, 4 insertions(+), 21 deletions(-) diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c index bee0568888da..bf026ea2f220 100644 --- a/fs/f2fs/namei.c +++ b/fs/f2fs/namei.c @@ -533,6 +533,10 @@ static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry, err = f2fs_prepare_lookup(dir, dentry, &fname); generic_set_encrypted_ci_d_ops(dentry); + + if (IS_CASEFOLDED(dir)) + d_set_casefolded_name(dentry); + if (err == -ENOENT) goto out_splice; if (err) @@ -578,17 +582,6 @@ static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry, goto out_iput; } out_splice: -#if IS_ENABLED(CONFIG_UNICODE) - if (!inode && IS_CASEFOLDED(dir)) { - /* Eventually we want to call d_add_ci(dentry, NULL) - * for negative dentries in the encoding case as - * well. For now, prevent the negative dentry - * from being cached. - */ - trace_f2fs_lookup_end(dir, dentry, ino, err); - return NULL; - } -#endif new = d_splice_alias(inode, dentry); trace_f2fs_lookup_end(dir, !IS_ERR_OR_NULL(new) ? new : dentry, ino, IS_ERR(new) ? PTR_ERR(new) : err); @@ -641,16 +634,6 @@ static int f2fs_unlink(struct inode *dir, struct dentry *dentry) f2fs_delete_entry(de, page, dir, inode); f2fs_unlock_op(sbi); -#if IS_ENABLED(CONFIG_UNICODE) - /* VFS negative dentries are incompatible with Encoding and - * Case-insensitiveness. Eventually we'll want avoid - * invalidating the dentries here, alongside with returning the - * negative dentries at f2fs_lookup(), when it is better - * supported by the VFS for the CI case. - */ - if (IS_CASEFOLDED(dir)) - d_invalidate(dentry); -#endif if (IS_DIRSYNC(dir)) f2fs_sync_fs(sbi->sb, 1); fail: