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Thu, 3 Nov 2022 12:49:55 +0000 (GMT) From: "Sungjong Seo" To: "'Namjae Jeon'" Cc: "'linux-kernel'" , "'linux-fsdevel'" , In-Reply-To: Subject: RE: [PATCH v2 1/2] exfat: simplify empty entry hint Date: Thu, 3 Nov 2022 21:49:55 +0900 Message-ID: <4ea901d8ef82$c64b7310$52e25930$@samsung.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQHcv1k1HOc4p1+ptDfeX3TNB2EsPgGzhLa+rhfn5CA= Content-Language: ko X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrIJsWRmVeSWpSXmKPExsWy7bCmnu6XHcnJBudmmlpMnLaU2WLP3pMs Fpd3zWGz2PLvCKsDi8emVZ1sHn1bVjF6fN4kF8Ac1cBok1iUnJFZlqqQmpecn5KZl26rFBri pmuhpJCRX1xiqxRtaGikZ2hgrmdkZKRnbBlrZWSqpJCXmJtqq1ShC9WrpFCUXABUm1tZDDQg J1UPKq5XnJqX4pCVXwpyol5xYm5xaV66XnJ+rpJCWWJOKdAIJf2Eb4wZBy/2shf8latY9CWo gfG7eBcjJ4eEgInE+jNNrF2MXBxCAjsYJX4v+MoMkhAS+MQo8eVuHUTiM6PEkfWXWGE6Ht77 zAyR2MUoMW3CaSjnJaPEsSNTmECq2AR0JZ7c+AmU4OAQEdCWuP8iHaSGWaCJUeLq7xNgNZwC sRJrjn9iB7GFBWwkFpz4CbaaRUBFYt3PH4wgNq+ApcSK+/fYIGxBiZMzn7CA2MwC8hLb385h hrhIQWL3p6Ng14kIWEmsXXeYDaJGRGJ2ZxtUzVd2iV1vRUHukRBwkThyxA4iLCzx6vgWdghb SuJlfxuU3c0o8eccL8jNEgITGCVa7pyF+t5Y4tPnz4wgc5gFNCXW79KHCCtK7Pw9lxHCFpQ4 fa2bGeIEPol3X3tYIdbySnS0CUGUqEh8/7CTZQKj8iwkj81C8tgsJA/MQli2gJFlFaNYakFx bnpqsWGBKXJsb2IEp04tyx2M099+0DvEyMTBeIhRgoNZSYT307bkZCHelMTKqtSi/Pii0pzU 4kOMycCgnsgsJZqcD0zeeSXxhibGBgZGwERobmluTISwpYGJmZGJhbGlsZmSOG/DDK1kIYH0 xJLU7NTUgtQimC1MHJxSDUwq/+2E5974z3VKqag6o3fO7F8LlMLmuleteb846Gnv3A+fZn2W 6Ei+VXvK/I7j7Gtnuv8d3x6Y/KVC/OrJBVftp+l2SnVZat6+8Ft8tVLqq4xzRX6LPryYcjB4 W1XwD+0Zc055Js3MvNNb23bIJnZBee0rptB3ZUKLqto49G2mJ2t7LAl3vbrN9aFU1Bm2rW31 czSZNlpNmvGq/OCS2Qfrk9+KRk68fvfI27TA2/a+EydVl3zca7vhmnn0u7MeKUe4pvmwH+/r reeKDHAUrlkr8+3T6cJ7MbKTA668T9xwWlazVuDFJZX6eeH5x8+LdDO9vhp+zNiwvqR7SV/F 3EnVq5ecjvi7KNLncrMI8xQLJZbijERDLeai4kQASnCvSlQEAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrBLMWRmVeSWpSXmKPExsWy7bCSnO6XHcnJBpe+M1lMnLaU2WLP3pMs Fpd3zWGz2PLvCKsDi8emVZ1sHn1bVjF6fN4kF8AcxWWTkpqTWZZapG+XwJVx8GIve8FfuYpF X4IaGL+LdzFyckgImEg8vPeZuYuRi0NIYAejxPzl9xi7GDmAElISB/dpQpjCEocPF0OUPGeU 6Fu1iRmkl01AV+LJjZ/MIDUiAtoS91+kg9QwC7QwSsxqfMYG0bCOUaJ11mRWkAZOgViJNcc/ sYPYwgI2EgtO/AQbxCKgIrHu5w9GEJtXwFJixf17bBC2oMTJmU9YQGxmoAW9D1sZIWx5ie1v 5zBDPKAgsfvTUbD5IgJWEmvXHWaDqBGRmN3ZxjyBUXgWklGzkIyahWTULCQtCxhZVjFKphYU 56bnFhsWGOWllusVJ+YWl+al6yXn525iBEeGltYOxj2rPugdYmTiYDzEKMHBrCTC+2lbcrIQ b0piZVVqUX58UWlOavEhRmkOFiVx3gtdJ+OFBNITS1KzU1MLUotgskwcnFINTGozZmyVaPze f+Tz0/iDgQ+9ylZt3jb92y7eufMjJYQ5ao8+K3JL9pbTjetnesHXF/Q8aLl/3KGnfQHOGWdt d+iUHeUoVRI5FH6h1XFRa8+xuSdrr6rlnYpzr+EqdTlTP3/6nvebT6rF/Je3PK7/cYW0wKrw yP0sK78eeVatvUb+mYescLXLj9xv/Ucmsoq7HTokIKV4Qkb3pKm5SRkTwzt25xc13atUJRYF zS1mD9MoLTM+2bIs4ULzNA0frTOOLjGMFsumlW+vXsi14NquT1kTxSN+rt6a+vyA9c7yLD2n NSo2l8M1zl+bx3+K/aebdSnbyQXmcldTVuz5+evRzGPvVZYsW1BlNHPifH33OUosxRmJhlrM RcWJAHsTd1P7AgAA X-CMS-MailID: 20221103124956epcas1p34c9cf3f29114e4f11f387b2ce5952eb7 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-Sendblock-Type: SVC_REQ_APPROVE X-ArchiveUser: EV CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20221102071135epcas1p2ef12631e6b239dded4224aa795ee5166 References: X-Spam-Status: No, score=-5.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL,SPF_HELO_PASS,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > This commit adds exfat_set_empty_hint()/exfat_reset_empty_hint() > to reduce code complexity and make code more readable. > > Signed-off-by: Yuezhang Mo > Reviewed-by: Andy Wu > Reviewed-by: Aoyama Wataru Reviewed-by: Sungjong Seo Looks good. Thanks! > --- > fs/exfat/dir.c | 58 +++++++++++++++++++++++++++----------------------- > 1 file changed, 31 insertions(+), 27 deletions(-) > > diff --git a/fs/exfat/dir.c b/fs/exfat/dir.c index > a27b55ec060a..9f9b8435baca 100644 > --- a/fs/exfat/dir.c > +++ b/fs/exfat/dir.c > @@ -897,6 +897,29 @@ struct exfat_entry_set_cache > *exfat_get_dentry_set(struct super_block *sb, > return NULL; > } > > +static inline void exfat_reset_empty_hint(struct exfat_hint_femp > +*hint_femp) { > + hint_femp->eidx = EXFAT_HINT_NONE; > + hint_femp->count = 0; > +} > + > +static inline void exfat_set_empty_hint(struct exfat_inode_info *ei, > + struct exfat_hint_femp *candi_empty, struct exfat_chain *clu, > + int dentry, int num_entries) > +{ > + if (ei->hint_femp.eidx == EXFAT_HINT_NONE || > + ei->hint_femp.eidx > dentry) { > + if (candi_empty->count == 0) { > + candi_empty->cur = *clu; > + candi_empty->eidx = dentry; > + } > + > + candi_empty->count++; > + if (candi_empty->count == num_entries) > + ei->hint_femp = *candi_empty; > + } > +} > + > enum { > DIRENT_STEP_FILE, > DIRENT_STEP_STRM, > @@ -921,7 +944,7 @@ int exfat_find_dir_entry(struct super_block *sb, > struct exfat_inode_info *ei, { > int i, rewind = 0, dentry = 0, end_eidx = 0, num_ext = 0, len; > int order, step, name_len = 0; > - int dentries_per_clu, num_empty = 0; > + int dentries_per_clu; > unsigned int entry_type; > unsigned short *uniname = NULL; > struct exfat_chain clu; > @@ -939,10 +962,13 @@ int exfat_find_dir_entry(struct super_block *sb, > struct exfat_inode_info *ei, > end_eidx = dentry; > } > > - candi_empty.eidx = EXFAT_HINT_NONE; > + exfat_reset_empty_hint(&ei->hint_femp); > + > rewind: > order = 0; > step = DIRENT_STEP_FILE; > + exfat_reset_empty_hint(&candi_empty); > + > while (clu.dir != EXFAT_EOF_CLUSTER) { > i = dentry & (dentries_per_clu - 1); > for (; i < dentries_per_clu; i++, dentry++) { @@ -962,26 > +988,8 @@ int exfat_find_dir_entry(struct super_block *sb, struct > exfat_inode_info *ei, > entry_type == TYPE_DELETED) { > step = DIRENT_STEP_FILE; > > - num_empty++; > - if (candi_empty.eidx == EXFAT_HINT_NONE && > - num_empty == 1) { > - exfat_chain_set(&candi_empty.cur, > - clu.dir, clu.size, clu.flags); > - } > - > - if (candi_empty.eidx == EXFAT_HINT_NONE && > - num_empty >= num_entries) { > - candi_empty.eidx = > - dentry - (num_empty - 1); > - WARN_ON(candi_empty.eidx < 0); > - candi_empty.count = num_empty; > - > - if (ei->hint_femp.eidx == > - EXFAT_HINT_NONE || > - candi_empty.eidx <= > - ei->hint_femp.eidx) > - ei->hint_femp = candi_empty; > - } > + exfat_set_empty_hint(ei, &candi_empty, &clu, > + dentry, num_entries); > > brelse(bh); > if (entry_type == TYPE_UNUSED) > @@ -989,8 +997,7 @@ int exfat_find_dir_entry(struct super_block *sb, > struct exfat_inode_info *ei, > continue; > } > > - num_empty = 0; > - candi_empty.eidx = EXFAT_HINT_NONE; > + exfat_reset_empty_hint(&candi_empty); > > if (entry_type == TYPE_FILE || entry_type == TYPE_DIR) > { > step = DIRENT_STEP_FILE; > @@ -1090,9 +1097,6 @@ int exfat_find_dir_entry(struct super_block *sb, > struct exfat_inode_info *ei, > rewind = 1; > dentry = 0; > clu.dir = p_dir->dir; > - /* reset empty hint */ > - num_empty = 0; > - candi_empty.eidx = EXFAT_HINT_NONE; > goto rewind; > } > > -- > 2.25.1