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Biederman" Message-ID: <20231127172544.GJ38156@ZenIV> References: <20231123171255.GN38156@ZenIV> <20231123182426.GO38156@ZenIV> <20231123215234.GQ38156@ZenIV> <20231125220136.GB38156@ZenIV> <20231126045219.GD38156@ZenIV> <20231126184141.GF38156@ZenIV> <20231127063842.GG38156@ZenIV> <87jzq3nqos.fsf@email.froward.int.ebiederm.org> <878r6jnq1t.fsf@email.froward.int.ebiederm.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <878r6jnq1t.fsf@email.froward.int.ebiederm.org> X-Headers-End: 1r7fMw-0005gT-AV Subject: Re: [f2fs-dev] fun with d_invalidate() vs. d_splice_alias() was Re: [PATCH v6 0/9] Support negative dentries on case-insensitive ext4 and f2fs 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: Christian Brauner , tytso@mit.edu, Miklos Szeredi , linux-f2fs-devel@lists.sourceforge.net, ebiggers@kernel.org, linux-fsdevel@vger.kernel.org, jaegeuk@kernel.org, linux-ext4@vger.kernel.org, Linus Torvalds , Gabriel Krisman Bertazi Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net On Mon, Nov 27, 2023 at 10:01:34AM -0600, Eric W. Biederman wrote: > "Eric W. Biederman" writes: > > > I am confused what is going on with ext4 and f2fs. I think they > > are calling d_invalidate when all they need to call is d_drop. > > ext4 and f2f2 are buggy in how they call d_invalidate, if I am reading > the code correctly. > > d_invalidate calls detach_mounts. > > detach_mounts relies on setting D_CANT_MOUNT on the top level dentry to > prevent races with new mounts. > > ext4 and f2fs (in their case insensitive code) are calling d_invalidate > before dont_mount has been called to set D_CANT_MOUNT. Not really - note that the place where we check cant_mount() is under the lock on the mountpoint's inode, so anything inside ->unlink() or ->rmdir() is indistinguishable from the places where we do dont_mount() in vfs_{unlink,rmdir}. _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel