This patch allows privileged users to reserve nodes via the 'reserve_node' mount option, which is similar to the existing 'reserve_root' option.
"-o reserve_node=<N>" means <N> nodes are reserved for privileged users only. Signed-off-by: Chunhai Guo <guochun...@vivo.com> --- v4->v5: Apply Chao's suggestion from v4. v3->v4: Rebase this patch on https://lore.kernel.org/linux-f2fs-devel/20250731060338.1136086-1-c...@kernel.org v2->v3: Apply Chao's suggestion from v2. v1->v2: Add two missing handling parts. v1: https://lore.kernel.org/linux-f2fs-devel/20250729095238.607433-1-guochun...@vivo.com/ --- Documentation/filesystems/f2fs.rst | 9 ++++--- fs/f2fs/f2fs.h | 17 ++++++++---- fs/f2fs/super.c | 43 +++++++++++++++++++++++++----- 3 files changed, 54 insertions(+), 15 deletions(-) diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst index 03b1efa6d3b2..95dbcd7ac9a8 100644 --- a/Documentation/filesystems/f2fs.rst +++ b/Documentation/filesystems/f2fs.rst @@ -173,9 +173,12 @@ data_flush Enable data flushing before checkpoint in order to persist data of regular and symlink. reserve_root=%d Support configuring reserved space which is used for allocation from a privileged user with specified uid or - gid, unit: 4KB, the default limit is 0.2% of user blocks. -resuid=%d The user ID which may use the reserved blocks. -resgid=%d The group ID which may use the reserved blocks. + gid, unit: 4KB, the default limit is 12.5% of user blocks. +reserve_node=%d Support configuring reserved nodes which are used for + allocation from a privileged user with specified uid or + gid, the default limit is 12.5% of all nodes. +resuid=%d The user ID which may use the reserved blocks and nodes. +resgid=%d The group ID which may use the reserved blocks and nodes. fault_injection=%d Enable fault injection in all supported types with specified injection rate. fault_type=%d Support configuring fault injection type, should be diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index eb372af22edc..a4e4c3931441 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -131,6 +131,7 @@ extern const char *f2fs_fault_name[FAULT_MAX]; * string rather than using the MS_LAZYTIME flag, so this must remain. */ #define F2FS_MOUNT_LAZYTIME 0x40000000 +#define F2FS_MOUNT_RESERVE_NODE 0x80000000 #define F2FS_OPTION(sbi) ((sbi)->mount_opt) #define clear_opt(sbi, option) (F2FS_OPTION(sbi).opt &= ~F2FS_MOUNT_##option) @@ -172,6 +173,7 @@ struct f2fs_rwsem { struct f2fs_mount_info { unsigned int opt; block_t root_reserved_blocks; /* root reserved blocks */ + block_t root_reserved_nodes; /* root reserved nodes */ kuid_t s_resuid; /* reserved blocks for uid */ kgid_t s_resgid; /* reserved blocks for gid */ int active_logs; /* # of active logs */ @@ -2355,7 +2357,7 @@ static inline bool f2fs_has_xattr_block(unsigned int ofs) return ofs == XATTR_NODE_OFFSET; } -static inline bool __allow_reserved_blocks(struct f2fs_sb_info *sbi, +static inline bool __allow_reserved_root(struct f2fs_sb_info *sbi, struct inode *inode, bool cap) { if (!inode) @@ -2380,7 +2382,7 @@ static inline unsigned int get_available_block_count(struct f2fs_sb_info *sbi, avail_user_block_count = sbi->user_block_count - sbi->current_reserved_blocks; - if (test_opt(sbi, RESERVE_ROOT) && !__allow_reserved_blocks(sbi, inode, cap)) + if (test_opt(sbi, RESERVE_ROOT) && !__allow_reserved_root(sbi, inode, cap)) avail_user_block_count -= F2FS_OPTION(sbi).root_reserved_blocks; if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) { @@ -2738,7 +2740,7 @@ static inline int inc_valid_node_count(struct f2fs_sb_info *sbi, struct inode *inode, bool is_inode) { block_t valid_block_count; - unsigned int valid_node_count; + unsigned int valid_node_count, avail_user_node_count; unsigned int avail_user_block_count; int err; @@ -2760,15 +2762,20 @@ static inline int inc_valid_node_count(struct f2fs_sb_info *sbi, spin_lock(&sbi->stat_lock); valid_block_count = sbi->total_valid_block_count + 1; - avail_user_block_count = get_available_block_count(sbi, inode, false); + avail_user_block_count = get_available_block_count(sbi, inode, + test_opt(sbi, RESERVE_NODE)); if (unlikely(valid_block_count > avail_user_block_count)) { spin_unlock(&sbi->stat_lock); goto enospc; } + avail_user_node_count = sbi->total_node_count - F2FS_RESERVED_NODE_NUM; + if (test_opt(sbi, RESERVE_NODE) && + !__allow_reserved_root(sbi, inode, true)) + avail_user_node_count -= F2FS_OPTION(sbi).root_reserved_nodes; valid_node_count = sbi->total_valid_node_count + 1; - if (unlikely(valid_node_count > sbi->total_node_count)) { + if (unlikely(valid_node_count > avail_user_node_count)) { spin_unlock(&sbi->stat_lock); goto enospc; } diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 30c038413040..a24e855a38ed 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -143,6 +143,7 @@ enum { Opt_extent_cache, Opt_data_flush, Opt_reserve_root, + Opt_reserve_node, Opt_resgid, Opt_resuid, Opt_mode, @@ -265,6 +266,7 @@ static const struct fs_parameter_spec f2fs_param_specs[] = { fsparam_flag_no("extent_cache", Opt_extent_cache), fsparam_flag("data_flush", Opt_data_flush), fsparam_u32("reserve_root", Opt_reserve_root), + fsparam_u32("reserve_node", Opt_reserve_node), fsparam_gid("resgid", Opt_resgid), fsparam_uid("resuid", Opt_resuid), fsparam_enum("mode", Opt_mode, f2fs_param_mode), @@ -336,6 +338,7 @@ static match_table_t f2fs_checkpoint_tokens = { #define F2FS_SPEC_discard_unit (1 << 21) #define F2FS_SPEC_memory_mode (1 << 22) #define F2FS_SPEC_errors (1 << 23) +#define F2FS_SPEC_reserve_node (1 << 24) struct f2fs_fs_context { struct f2fs_mount_info info; @@ -437,22 +440,30 @@ static void f2fs_destroy_casefold_cache(void) { } static inline void limit_reserve_root(struct f2fs_sb_info *sbi) { - block_t limit = min((sbi->user_block_count >> 3), + block_t block_limit = min((sbi->user_block_count >> 3), sbi->user_block_count - sbi->reserved_blocks); + block_t node_limit = sbi->total_node_count >> 3; /* limit is 12.5% */ if (test_opt(sbi, RESERVE_ROOT) && - F2FS_OPTION(sbi).root_reserved_blocks > limit) { - F2FS_OPTION(sbi).root_reserved_blocks = limit; + F2FS_OPTION(sbi).root_reserved_blocks > block_limit) { + F2FS_OPTION(sbi).root_reserved_blocks = block_limit; f2fs_info(sbi, "Reduce reserved blocks for root = %u", F2FS_OPTION(sbi).root_reserved_blocks); } - if (!test_opt(sbi, RESERVE_ROOT) && + if (test_opt(sbi, RESERVE_NODE) && + F2FS_OPTION(sbi).root_reserved_nodes > node_limit) { + F2FS_OPTION(sbi).root_reserved_nodes = node_limit; + f2fs_info(sbi, "Reduce reserved nodes for root = %u", + F2FS_OPTION(sbi).root_reserved_nodes); + } + if (!test_opt(sbi, RESERVE_ROOT) && !test_opt(sbi, RESERVE_NODE) && (!uid_eq(F2FS_OPTION(sbi).s_resuid, make_kuid(&init_user_ns, F2FS_DEF_RESUID)) || !gid_eq(F2FS_OPTION(sbi).s_resgid, make_kgid(&init_user_ns, F2FS_DEF_RESGID)))) - f2fs_info(sbi, "Ignore s_resuid=%u, s_resgid=%u w/o reserve_root", + f2fs_info(sbi, "Ignore s_resuid=%u, s_resgid=%u w/o reserve_root" + " and reserve_node", from_kuid_munged(&init_user_ns, F2FS_OPTION(sbi).s_resuid), from_kgid_munged(&init_user_ns, @@ -841,6 +852,11 @@ static int f2fs_parse_param(struct fs_context *fc, struct fs_parameter *param) F2FS_CTX_INFO(ctx).root_reserved_blocks = result.uint_32; ctx->spec_mask |= F2FS_SPEC_reserve_root; break; + case Opt_reserve_node: + ctx_set_opt(ctx, F2FS_MOUNT_RESERVE_NODE); + F2FS_CTX_INFO(ctx).root_reserved_nodes = result.uint_32; + ctx->spec_mask |= F2FS_SPEC_reserve_node; + break; case Opt_resuid: F2FS_CTX_INFO(ctx).s_resuid = result.uid; ctx->spec_mask |= F2FS_SPEC_resuid; @@ -1424,6 +1440,14 @@ static int f2fs_check_opt_consistency(struct fs_context *fc, ctx_clear_opt(ctx, F2FS_MOUNT_RESERVE_ROOT); ctx->opt_mask &= ~F2FS_MOUNT_RESERVE_ROOT; } + if (test_opt(sbi, RESERVE_NODE) && + (ctx->opt_mask & F2FS_MOUNT_RESERVE_NODE) && + ctx_test_opt(ctx, F2FS_MOUNT_RESERVE_NODE)) { + f2fs_info(sbi, "Preserve previous reserve_node=%u", + F2FS_OPTION(sbi).root_reserved_nodes); + ctx_clear_opt(ctx, F2FS_MOUNT_RESERVE_NODE); + ctx->opt_mask &= ~F2FS_MOUNT_RESERVE_NODE; + } err = f2fs_check_test_dummy_encryption(fc, sb); if (err) @@ -1623,6 +1647,9 @@ static void f2fs_apply_options(struct fs_context *fc, struct super_block *sb) if (ctx->spec_mask & F2FS_SPEC_reserve_root) F2FS_OPTION(sbi).root_reserved_blocks = F2FS_CTX_INFO(ctx).root_reserved_blocks; + if (ctx->spec_mask & F2FS_SPEC_reserve_node) + F2FS_OPTION(sbi).root_reserved_nodes = + F2FS_CTX_INFO(ctx).root_reserved_nodes; if (ctx->spec_mask & F2FS_SPEC_resgid) F2FS_OPTION(sbi).s_resgid = F2FS_CTX_INFO(ctx).s_resgid; if (ctx->spec_mask & F2FS_SPEC_resuid) @@ -2342,9 +2369,11 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root) else if (F2FS_OPTION(sbi).fs_mode == FS_MODE_FRAGMENT_BLK) seq_puts(seq, "fragment:block"); seq_printf(seq, ",active_logs=%u", F2FS_OPTION(sbi).active_logs); - if (test_opt(sbi, RESERVE_ROOT)) - seq_printf(seq, ",reserve_root=%u,resuid=%u,resgid=%u", + if (test_opt(sbi, RESERVE_ROOT) || test_opt(sbi, RESERVE_NODE)) + seq_printf(seq, ",reserve_root=%u,reserve_node=%u,resuid=%u," + "resgid=%u", F2FS_OPTION(sbi).root_reserved_blocks, + F2FS_OPTION(sbi).root_reserved_nodes, from_kuid_munged(&init_user_ns, F2FS_OPTION(sbi).s_resuid), from_kgid_munged(&init_user_ns, -- 2.34.1 _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
