kernel/linux.git/fs/9p/fid.c, branch linux-7.1.y

9p: v9fs_fid_find: also lookup by inode if not found dentry

2024-09-22T20:51:27+00:00

It's possible for v9fs_fid_find "find by dentry" branch to not turn up anything despite having an entry set (because e.g. uid doesn't match), in which case the calling code will generally make an extra lookup to the server. In this case we might have had better luck looking by inode, so fall back to look up by inode if we have one and the lookup by dentry failed. Message-Id: <20240523210024.1214386-1-asmadeus@codewreck.org> Reviewed-by: Christian Schoenebeck Signed-off-by: Dominique Martinet

fs/9p: remove writeback fid and fix per-file modes

2023-03-27T02:33:48+00:00

This patch removes the creating of an additional writeback_fid for opened files. The patch addresses problems when files were opened write-only or getattr on files with dirty caches. This patch also incorporates information about cache behavior in the fid for every file. This allows us to reflect cache behavior from mount flags, open mode, and information from the server to inform readahead and writeback behavior. This includes adding support for a 9p semantic that qid.version==0 is used to mark a file as non-cachable which is important for synthetic files. This may have a side-effect of not supporting caching on certain legacy file servers that do not properly set qid.version. There is also now a mount flag which can disable the qid.version behavior. Signed-off-by: Eric Van Hensbergen

9p/fs: Remove unneeded idr.h #include

2022-12-02T14:59:15+00:00

The 9p fs does not use IDR or IDA functionalities. So there is no point in including . Remove it. Link: https://lkml.kernel.org/r/3d1e0ed9714eaee7e18d9f5b0b4bfa49b00b286d.1669553950.git.christophe.jaillet@wanadoo.fr Signed-off-by: Christophe JAILLET Reviewed-by: Christian Schoenebeck [Dominique: reword subject] Signed-off-by: Dominique Martinet

9p: Fix some kernel-doc comments

2022-07-02T09:52:21+00:00

Remove warnings found by running scripts/kernel-doc, which is caused by using 'make W=1'. fs/9p/fid.c:35: warning: Function parameter or member 'pfid' not described in 'v9fs_fid_add' fs/9p/fid.c:35: warning: Excess function parameter 'fid' description in 'v9fs_fid_add' fs/9p/fid.c:80: warning: Function parameter or member 'pfid' not described in 'v9fs_open_fid_add' fs/9p/fid.c:80: warning: Excess function parameter 'fid' description in 'v9fs_open_fid_add' Link: https://lkml.kernel.org/r/20220615012039.43479-1-yang.lee@linux.alibaba.com Reported-by: Abaci Robot Signed-off-by: Yang Li [Dominique: further adjust comment] Signed-off-by: Dominique Martinet

9p fid refcount: cleanup p9_fid_put calls

2022-07-02T09:52:21+00:00

Simplify p9_fid_put cleanup path in many 9p functions since the function is noop on null or error fids. Also make the *_add_fid() helpers "steal" the fid by nulling its pointer, so put after them will be noop. This should lead to no change of behaviour Link: https://lkml.kernel.org/r/20220612085330.1451496-7-asmadeus@codewreck.org Reviewed-by: Tyler Hicks Signed-off-by: Dominique Martinet

9p fid refcount: add p9_fid_get/put wrappers

2022-07-02T09:52:21+00:00

I was recently reminded that it is not clear that p9_client_clunk() was actually just decrementing refcount and clunking only when that reaches zero: make it clear through a set of helpers. This will also allow instrumenting refcounting better for debugging next patch Link: https://lkml.kernel.org/r/20220612085330.1451496-5-asmadeus@codewreck.org Reviewed-by: Tyler Hicks Reviewed-by: Christian Schoenebeck Signed-off-by: Dominique Martinet

9p: Fix minor typo in code comment

2022-07-02T09:52:21+00:00

Fix s/patch/path/ typo and make it clear that we're talking about multiple path components. Link: https://lkml.kernel.org/r/20220527000003.355812-6-tyhicks@linux.microsoft.com Signed-off-by: Tyler Hicks Signed-off-by: Dominique Martinet

9p: Remove unnecessary variable for old fids while walking from d_parent

2022-07-02T09:52:21+00:00

Remove the ofid variable that's local to the conditional block in favor of the old_fid variable that's local to the entire function. Link: https://lkml.kernel.org/r/20220527000003.355812-5-tyhicks@linux.microsoft.com Signed-off-by: Tyler Hicks Signed-off-by: Dominique Martinet

9p: Make the path walk logic more clear about when cloning is required

2022-07-02T09:52:21+00:00

Cloning during a path component walk is only needed when the old fid used for the walk operation is the root fid. Make that clear by comparing the two fids rather than using an additional variable. Link: https://lkml.kernel.org/r/20220527000003.355812-4-tyhicks@linux.microsoft.com Signed-off-by: Tyler Hicks Signed-off-by: Dominique Martinet

9p: Track the root fid with its own variable during lookups

2022-07-02T09:52:21+00:00

Improve readability by using a new variable when dealing with the root fid. The root fid requires special handling in comparison to other fids used during fid lookup. Link: https://lkml.kernel.org/r/20220527000003.355812-3-tyhicks@linux.microsoft.com Signed-off-by: Tyler Hicks Signed-off-by: Dominique Martinet