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Tue, 27 Aug 2024 02:14:22 +0900 (KST) Received: from epsmtrp2.samsung.com (unknown [182.195.40.14]) by epcas5p2.samsung.com (KnoxPortal) with ESMTPA id 20240826171422epcas5p2fa8f07dfee9395745f1833a17fd89ae0~vVqgJJQK20606606066epcas5p2b; Mon, 26 Aug 2024 17:14:22 +0000 (GMT) Received: from epsmgmcp1.samsung.com (unknown [182.195.42.82]) by epsmtrp2.samsung.com (KnoxPortal) with ESMTP id 20240826171422epsmtrp2c1f602264c43742010b82095caff9901~vVqgIV8sL3048030480epsmtrp2k; Mon, 26 Aug 2024 17:14:22 +0000 (GMT) X-AuditID: b6c32a49-a57ff700000025a8-a3-66ccb7eef81b Received: from epsmtip2.samsung.com ( [182.195.34.31]) by epsmgmcp1.samsung.com (Symantec Messaging Gateway) with SMTP id 2E.51.19367.DE7BCC66; Tue, 27 Aug 2024 02:14:21 +0900 (KST) Received: from localhost.localdomain (unknown [107.99.41.245]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20240826171417epsmtip2300cf238d11e054982f5ca67e497e4ab~vVqcWaisS0040200402epsmtip2e; Mon, 26 Aug 2024 17:14:17 +0000 (GMT) From: Kanchan Joshi To: axboe@kernel.dk, kbusch@kernel.org, hch@lst.de, sagi@grimberg.me, martin.petersen@oracle.com, James.Bottomley@HansenPartnership.com, brauner@kernel.org, jack@suse.cz, jaegeuk@kernel.org, jlayton@kernel.org, chuck.lever@oracle.com, bvanassche@acm.org Cc: linux-nvme@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, gost.dev@samsung.com, vishak.g@samsung.com, javier.gonz@samsung.com, Kanchan Joshi , Nitesh Shetty Subject: [PATCH v4 3/5] fcntl: add F_{SET/GET}_RW_HINT_EX Date: Mon, 26 Aug 2024 22:36:04 +0530 Message-Id: <20240826170606.255718-4-joshi.k@samsung.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240826170606.255718-1-joshi.k@samsung.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrDJsWRmVeSWpSXmKPExsWy7bCmpu677WfSDL7/0rRYfbefzeL14U+M FtM+/GS2+H/3OZPFzQM7mSxWrj7KZDF7ejOTxZP1s5gtNvZzWDy+85nd4ueyVewWR/+/ZbOY dOgao8XeW9oWlxa5W+zZe5LFYv6yp+wW3dd3sFksP/6PyWLb7/nMFutev2exOD9rDruDmMfl K94e5+9tZPGYNukUm8fls6Uem1Z1snlsXlLvsXvBZyaP3Tcb2Dw+Pr3F4tG3ZRWjx5kFR9g9 Pm+SC+CJyrbJSE1MSS1SSM1Lzk/JzEu3VfIOjneONzUzMNQ1tLQwV1LIS8xNtVVy8QnQdcvM AXpXSaEsMacUKBSQWFyspG9nU5RfWpKqkJFfXGKrlFqQklNgUqBXnJhbXJqXrpeXWmJlaGBg ZApUmJCdMefBNOaCv1oV7aseMjYwvlHqYuTkkBAwkdhzaQtzFyMXh5DAbkaJ0x3HWSGcT4wS jRNfMsE5b1Z8Y4VpeTX7LlTVTkaJqb3tbBDOZ0aJc6eaGLsYOTjYBDQlLkwuBYmLCDQzSWxc +wusiFlgN5PEgq7/zCBFwgKWEnseWIJMZRFQlTj/dTY7iM0LFG6fvZwJYpu8xMxL38HinAJW Ev8/vIeqEZQ4OfMJC4jNDFTTvHU22BMSAj84JF5suQB1qovEvs7bLBC2sMSr41vYIWwpic/v 9rJB2NkSDx49gKqpkdixuQ+q116i4c8NVpA7mYGeWb9LH2IXn0Tv7ydMIGEJAV6JjjYhiGpF iXuTnkJ1iks8nLEEyvaQuPv3CzSwehkl5h9/wzKBUX4WkhdmIXlhFsK2BYzMqxglUwuKc9NT i00LDPNSy+Exm5yfu4kRnOy1PHcw3n3wQe8QIxMH4yFGCQ5mJRFeucsn04R4UxIrq1KL8uOL SnNSiw8xmgLDeCKzlGhyPjDf5JXEG5pYGpiYmZmZWBqbGSqJ875unZsiJJCeWJKanZpakFoE 08fEwSnVwKSau+vF5vCFhwqDZ+xtEFvmXm0p9qyzK0/VUGNvwLugNIVs/b33/vM6hve4scz6 mrfgDmNk+9RjnveaZ6s7HJaOf/Wq2+OZisu3OUu+KjTLLutawfzqOytXosyEpY++NDwQuFyT q3Ot3kdYQ1z88iTJv+cm9M0NvSrhu/+IoHL1rwrmW/m/NX4cnH3S8mmMQ5WRrOyeX2823Dct r1ofcPg4x7l15xu5hGYzCl9VmRRZt/0f2zs5U+Vsv5T56edK1hceW97A8HO+S8nWYwILfcOq 88+H12jUWF/YvzHprceeV4ohP6tbNG/nvHd1UGwJTCnVju7MPlTV/ij5tOyBz1vOBlSvs/xk t4JdjctpqhJLcUaioRZzUXEiAMWP8nd/BAAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrNIsWRmVeSWpSXmKPExsWy7bCSvO7b7WfSDC5uN7VYfbefzeL14U+M FtM+/GS2+H/3OZPFzQM7mSxWrj7KZDF7ejOTxZP1s5gtNvZzWDy+85nd4ueyVewWR/+/ZbOY dOgao8XeW9oWlxa5W+zZe5LFYv6yp+wW3dd3sFksP/6PyWLb7/nMFutev2exOD9rDruDmMfl K94e5+9tZPGYNukUm8fls6Uem1Z1snlsXlLvsXvBZyaP3Tcb2Dw+Pr3F4tG3ZRWjx5kFR9g9 Pm+SC+CJ4rJJSc3JLEst0rdL4MqY82Aac8FfrYr2VQ8ZGxjfKHUxcnJICJhIvJp9l7WLkYtD SGA7o8Tb47uZIBLiEs3XfrBD2MISK/89Z4co+sgoMa+tG6iIg4NNQFPiwuRSkLiIwGQmiaaH W1hAHGaBo0wSW2fuYwUpEhawlNjzwBJkEIuAqsT5r7PBhvIChdtnL4daJi8x89J3sDingJXE /w/vwWwhoJqVZ5ZD1QtKnJz5hAXEZgaqb946m3kCo8AsJKlZSFILGJlWMYqmFhTnpucmFxjq FSfmFpfmpesl5+duYgTHp1bQDsZl6//qHWJk4mA8xCjBwawkwit3+WSaEG9KYmVValF+fFFp TmrxIUZpDhYlcV7lnM4UIYH0xJLU7NTUgtQimCwTB6dUA5NwpdW8GdZbF6cERizt02P/Xx5j s+M8l3SYaErctgkG4R7rvUqUXU1cn4TJdrYu1l/3ZNGr83cC211mP44qNAqeeIThr7meRFzW 1PnRUwpqJ1Ws+1/V+O+P4HHLa7Ud/q0TfExbt/K0FB5dZxD8TXiHbWiftb/2J0Zz59D71ysa 5n93lq8tnZW0VUnndY/U3vDl+532KhvN/8WWFLueuyxp02KZe+K3tslvkn3Md3fZq7m50tHB bp7Zf0+/2J8pe/rYtHjnPT8vyHFMEVm84qlxfrXSUoc76ltC10Ve3im5JMkjoiox/dWt6AmH a0V1NQQvx2U47XxZlzOL5/WRGVcqXWZ9brD63/qOK2jtCSWW4oxEQy3mouJEAD2lDs0+AwAA X-CMS-MailID: 20240826171422epcas5p2fa8f07dfee9395745f1833a17fd89ae0 X-Msg-Generator: CA CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20240826171422epcas5p2fa8f07dfee9395745f1833a17fd89ae0 References: <20240826170606.255718-1-joshi.k@samsung.com> This is similar to existing F_{SET/GET}_RW_HINT but more generic/extensible. F_SET/GET_RW_HINT_EX take a pointer to a struct rw_hint_ex as argument: struct rw_hint_ex { __u8 type; __u8 pad[7]; __u64 val; }; With F_SET_RW_HINT_EX, the user passes the hint type and its value. Hint type can be either life hint (TYPE_RW_LIFE_HINT) or placement hint (TYPE_RW_PLACEMENT_HINT). The interface allows to add more hint types in future. Valid values for life hints are same as enforced by existing fcntl(F_SET_RW_HINT). Valid values for placement hints are between 0 to 127, both inclusive. The inode retains either the life hint or the placement hint, whichever is set later. The set hint type and its value can be queried by F_GET_RW_HINT_EX. The i_write_hint field of the inode is a 1-byte field. Use the most significant bit as the hint type. This bit is set for placement hint. For life hint, this bit remains zero. Signed-off-by: Kanchan Joshi Signed-off-by: Nitesh Shetty --- fs/fcntl.c | 67 ++++++++++++++++++++++++++++++++++++++ include/linux/rw_hint.h | 13 ++++++++ include/uapi/linux/fcntl.h | 14 ++++++++ 3 files changed, 94 insertions(+) diff --git a/fs/fcntl.c b/fs/fcntl.c index 46cf08f67278..d82fd4142104 100644 --- a/fs/fcntl.c +++ b/fs/fcntl.c @@ -291,6 +291,14 @@ static bool rw_life_hint_valid(u64 hint) } } +static inline bool rw_placement_hint_valid(u64 val) +{ + if (val <= MAX_PLACEMENT_HINT_VAL) + return true; + + return false; +} + static long fcntl_get_rw_life_hint(struct file *file, unsigned int cmd, unsigned long arg) { @@ -327,6 +335,59 @@ static long fcntl_set_rw_life_hint(struct file *file, unsigned int cmd, return 0; } +static long fcntl_get_rw_hint_ex(struct file *file, unsigned int cmd, + unsigned long arg) +{ + struct rw_hint_ex __user *rw_hint_ex_p = (void __user *)arg; + struct rw_hint_ex rwh = {}; + struct inode *inode = file_inode(file); + u8 hint = READ_ONCE(inode->i_write_hint); + + rwh.type = WRITE_HINT_TYPE(hint); + rwh.val = WRITE_HINT_VAL(hint); + + if (copy_to_user(rw_hint_ex_p, &rwh, sizeof(rwh))) + return -EFAULT; + + return 0; +} + +static long fcntl_set_rw_hint_ex(struct file *file, unsigned int cmd, + unsigned long arg) +{ + struct rw_hint_ex __user *rw_hint_ex_p = (void __user *)arg; + struct rw_hint_ex rwh; + struct inode *inode = file_inode(file); + u64 hint; + int i; + + if (copy_from_user(&rwh, rw_hint_ex_p, sizeof(rwh))) + return -EFAULT; + for (i = 0; i < ARRAY_SIZE(rwh.pad); i++) + if (rwh.pad[i]) + return -EINVAL; + switch (rwh.type) { + case TYPE_RW_LIFE_HINT: + if (!rw_life_hint_valid(rwh.val)) + return -EINVAL; + hint = rwh.val; + break; + case TYPE_RW_PLACEMENT_HINT: + if (!rw_placement_hint_valid(rwh.val)) + return -EINVAL; + hint = PLACEMENT_HINT_TYPE | rwh.val; + break; + default: + return -EINVAL; + } + + WRITE_ONCE(inode->i_write_hint, hint); + if (file->f_mapping->host != inode) + WRITE_ONCE(file->f_mapping->host->i_write_hint, hint); + + return 0; +} + /* Is the file descriptor a dup of the file? */ static long f_dupfd_query(int fd, struct file *filp) { @@ -454,6 +515,12 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg, case F_SET_RW_HINT: err = fcntl_set_rw_life_hint(filp, cmd, arg); break; + case F_GET_RW_HINT_EX: + err = fcntl_get_rw_hint_ex(filp, cmd, arg); + break; + case F_SET_RW_HINT_EX: + err = fcntl_set_rw_hint_ex(filp, cmd, arg); + break; default: break; } diff --git a/include/linux/rw_hint.h b/include/linux/rw_hint.h index e17fd9fa65d4..611c51d23d96 100644 --- a/include/linux/rw_hint.h +++ b/include/linux/rw_hint.h @@ -16,4 +16,17 @@ enum rw_life_hint { WRITE_LIFE_EXTREME = RWH_WRITE_LIFE_EXTREME, }; +#define WRITE_HINT_TYPE_BIT BIT(7) +#define WRITE_HINT_VAL_MASK (WRITE_HINT_TYPE_BIT - 1) +#define WRITE_HINT_TYPE(h) (((h) & WRITE_HINT_TYPE_BIT) ? \ + TYPE_RW_PLACEMENT_HINT : TYPE_RW_LIFE_HINT) +#define WRITE_HINT_VAL(h) ((h) & WRITE_HINT_VAL_MASK) + +#define WRITE_PLACEMENT_HINT(h) (((h) & WRITE_HINT_TYPE_BIT) ? \ + WRITE_HINT_VAL(h) : 0) +#define WRITE_LIFE_HINT(h) (((h) & WRITE_HINT_TYPE_BIT) ? \ + 0 : WRITE_HINT_VAL(h)) + +#define PLACEMENT_HINT_TYPE WRITE_HINT_TYPE_BIT +#define MAX_PLACEMENT_HINT_VAL WRITE_HINT_VAL_MASK #endif /* _LINUX_RW_HINT_H */ diff --git a/include/uapi/linux/fcntl.h b/include/uapi/linux/fcntl.h index c0bcc185fa48..dfe77fa86776 100644 --- a/include/uapi/linux/fcntl.h +++ b/include/uapi/linux/fcntl.h @@ -57,6 +57,8 @@ #define F_SET_RW_HINT (F_LINUX_SPECIFIC_BASE + 12) #define F_GET_FILE_RW_HINT (F_LINUX_SPECIFIC_BASE + 13) #define F_SET_FILE_RW_HINT (F_LINUX_SPECIFIC_BASE + 14) +#define F_GET_RW_HINT_EX (F_LINUX_SPECIFIC_BASE + 15) +#define F_SET_RW_HINT_EX (F_LINUX_SPECIFIC_BASE + 16) /* * Valid hint values for F_{GET,SET}_RW_HINT. 0 is "not set", or can be @@ -76,6 +78,18 @@ */ #define RWF_WRITE_LIFE_NOT_SET RWH_WRITE_LIFE_NOT_SET +enum rw_hint_type { + TYPE_RW_LIFE_HINT, + TYPE_RW_PLACEMENT_HINT +}; + +/* Exchange information with F_{GET/SET}_RW_HINT fcntl */ +struct rw_hint_ex { + __u8 type; + __u8 pad[7]; + __u64 val; +}; + /* * Types of directory notifications that may be requested. */