cregit-Linux how code gets into the kernel

Release 4.12 include/linux/quota.h

Directory: include/linux
/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Robert Elz at The University of Melbourne.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
#ifndef _LINUX_QUOTA_

#define _LINUX_QUOTA_

#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/rwsem.h>
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/percpu_counter.h>

#include <linux/dqblk_xfs.h>
#include <linux/dqblk_v1.h>
#include <linux/dqblk_v2.h>

#include <linux/atomic.h>
#include <linux/uidgid.h>
#include <linux/projid.h>
#include <uapi/linux/quota.h>


#undef USRQUOTA

#undef GRPQUOTA

#undef PRJQUOTA

enum quota_type {
	
USRQUOTA = 0,		/* element used for user quotas */
	
GRPQUOTA = 1,		/* element used for group quotas */
	
PRJQUOTA = 2,		/* element used for project quotas */
};

/* Masks for quota types when used as a bitmask */

#define QTYPE_MASK_USR (1 << USRQUOTA)

#define QTYPE_MASK_GRP (1 << GRPQUOTA)

#define QTYPE_MASK_PRJ (1 << PRJQUOTA)


typedef __kernel_uid32_t qid_t; 
/* Type in which we store ids in memory */

typedef long long qsize_t;	
/* Type in which we store sizes */


struct kqid {			/* Type in which we store the quota identifier */
	union {
		
kuid_t uid;
		
kgid_t gid;
		
kprojid_t projid;
	};
	
enum quota_type type;  /* USRQUOTA (uid) or GRPQUOTA (gid) or PRJQUOTA (projid) */
};

extern bool qid_eq(struct kqid left, struct kqid right);
extern bool qid_lt(struct kqid left, struct kqid right);
extern qid_t from_kqid(struct user_namespace *to, struct kqid qid);
extern qid_t from_kqid_munged(struct user_namespace *to, struct kqid qid);
extern bool qid_valid(struct kqid qid);

/**
 *      make_kqid - Map a user-namespace, type, qid tuple into a kqid.
 *      @from: User namespace that the qid is in
 *      @type: The type of quota
 *      @qid: Quota identifier
 *
 *      Maps a user-namespace, type qid tuple into a kernel internal
 *      kqid, and returns that kqid.
 *
 *      When there is no mapping defined for the user-namespace, type,
 *      qid tuple an invalid kqid is returned.  Callers are expected to
 *      test for and handle handle invalid kqids being returned.
 *      Invalid kqids may be tested for using qid_valid().
 */

static inline struct kqid make_kqid(struct user_namespace *from, enum quota_type type, qid_t qid) { struct kqid kqid; kqid.type = type; switch (type) { case USRQUOTA: kqid.uid = make_kuid(from, qid); break; case GRPQUOTA: kqid.gid = make_kgid(from, qid); break; case PRJQUOTA: kqid.projid = make_kprojid(from, qid); break; default: BUG(); } return kqid; }

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Eric W. Biedermann88100.00%1100.00%
Total88100.00%1100.00%

/** * make_kqid_invalid - Explicitly make an invalid kqid * @type: The type of quota identifier * * Returns an invalid kqid with the specified type. */
static inline struct kqid make_kqid_invalid(enum quota_type type) { struct kqid kqid; kqid.type = type; switch (type) { case USRQUOTA: kqid.uid = INVALID_UID; break; case GRPQUOTA: kqid.gid = INVALID_GID; break; case PRJQUOTA: kqid.projid = INVALID_PROJID; break; default: BUG(); } return kqid; }

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Eric W. Biedermann65100.00%1100.00%
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/** * make_kqid_uid - Make a kqid from a kuid * @uid: The kuid to make the quota identifier from */
static inline struct kqid make_kqid_uid(kuid_t uid) { struct kqid kqid; kqid.type = USRQUOTA; kqid.uid = uid; return kqid; }

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Eric W. Biedermann30100.00%1100.00%
Total30100.00%1100.00%

/** * make_kqid_gid - Make a kqid from a kgid * @gid: The kgid to make the quota identifier from */
static inline struct kqid make_kqid_gid(kgid_t gid) { struct kqid kqid; kqid.type = GRPQUOTA; kqid.gid = gid; return kqid; }

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Eric W. Biedermann30100.00%1100.00%
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/** * make_kqid_projid - Make a kqid from a projid * @projid: The kprojid to make the quota identifier from */
static inline struct kqid make_kqid_projid(kprojid_t projid) { struct kqid kqid; kqid.type = PRJQUOTA; kqid.projid = projid; return kqid; }

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Eric W. Biedermann30100.00%1100.00%
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/** * qid_has_mapping - Report if a qid maps into a user namespace. * @ns: The user namespace to see if a value maps into. * @qid: The kernel internal quota identifier to test. */
static inline bool qid_has_mapping(struct user_namespace *ns, struct kqid qid) { return from_kqid(ns, qid) != (qid_t) -1; }

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Eric W. Biedermann30100.00%1100.00%
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extern spinlock_t dq_data_lock; /* Maximal numbers of writes for quota operation (insert/delete/update) * (over VFS all formats) */ #define DQUOT_INIT_ALLOC max(V1_INIT_ALLOC, V2_INIT_ALLOC) #define DQUOT_INIT_REWRITE max(V1_INIT_REWRITE, V2_INIT_REWRITE) #define DQUOT_DEL_ALLOC max(V1_DEL_ALLOC, V2_DEL_ALLOC) #define DQUOT_DEL_REWRITE max(V1_DEL_REWRITE, V2_DEL_REWRITE) /* * Data for one user/group kept in memory */ struct mem_dqblk { qsize_t dqb_bhardlimit; /* absolute limit on disk blks alloc */ qsize_t dqb_bsoftlimit; /* preferred limit on disk blks */ qsize_t dqb_curspace; /* current used space */ qsize_t dqb_rsvspace; /* current reserved space for delalloc*/ qsize_t dqb_ihardlimit; /* absolute limit on allocated inodes */ qsize_t dqb_isoftlimit; /* preferred inode limit */ qsize_t dqb_curinodes; /* current # allocated inodes */ time64_t dqb_btime; /* time limit for excessive disk use */ time64_t dqb_itime; /* time limit for excessive inode use */ }; /* * Data for one quotafile kept in memory */ struct quota_format_type; struct mem_dqinfo { struct quota_format_type *dqi_format; int dqi_fmt_id; /* Id of the dqi_format - used when turning * quotas on after remount RW */ struct list_head dqi_dirty_list; /* List of dirty dquots */ unsigned long dqi_flags; unsigned int dqi_bgrace; unsigned int dqi_igrace; qsize_t dqi_max_spc_limit; qsize_t dqi_max_ino_limit; void *dqi_priv; }; struct super_block; /* Mask for flags passed to userspace */ #define DQF_GETINFO_MASK (DQF_ROOT_SQUASH | DQF_SYS_FILE) /* Mask for flags modifiable from userspace */ #define DQF_SETINFO_MASK DQF_ROOT_SQUASH enum { DQF_INFO_DIRTY_B = DQF_PRIVATE, }; #define DQF_INFO_DIRTY (1 << DQF_INFO_DIRTY_B) /* Is info dirty? */ extern void mark_info_dirty(struct super_block *sb, int type);
static inline int info_dirty(struct mem_dqinfo *info) { return test_bit(DQF_INFO_DIRTY_B, &info->dqi_flags); }

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Jan Kara23100.00%2100.00%
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enum { DQST_LOOKUPS, DQST_DROPS, DQST_READS, DQST_WRITES, DQST_CACHE_HITS, DQST_ALLOC_DQUOTS, DQST_FREE_DQUOTS, DQST_SYNCS, _DQST_DQSTAT_LAST }; struct dqstats { int stat[_DQST_DQSTAT_LAST]; struct percpu_counter counter[_DQST_DQSTAT_LAST]; }; extern struct dqstats *dqstats_pcpu; extern struct dqstats dqstats;
static inline void dqstats_inc(unsigned int type) { percpu_counter_inc(&dqstats.counter[type]); }

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static inline void dqstats_dec(unsigned int type) { percpu_counter_dec(&dqstats.counter[type]); }

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Dmitriy Monakhov22100.00%2100.00%
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#define DQ_MOD_B 0 /* dquot modified since read */ #define DQ_BLKS_B 1 /* uid/gid has been warned about blk limit */ #define DQ_INODES_B 2 /* uid/gid has been warned about inode limit */ #define DQ_FAKE_B 3 /* no limits only usage */ #define DQ_READ_B 4 /* dquot was read into memory */ #define DQ_ACTIVE_B 5 /* dquot is active (dquot_release not called) */ #define DQ_LASTSET_B 6 /* Following 6 bits (see QIF_) are reserved\ * for the mask of entries set via SETQUOTA\ * quotactl. They are set under dq_data_lock\ * and the quota format handling dquot can\ * clear them when it sees fit. */ struct dquot { struct hlist_node dq_hash; /* Hash list in memory */ struct list_head dq_inuse; /* List of all quotas */ struct list_head dq_free; /* Free list element */ struct list_head dq_dirty; /* List of dirty dquots */ struct mutex dq_lock; /* dquot IO lock */ atomic_t dq_count; /* Use count */ wait_queue_head_t dq_wait_unused; /* Wait queue for dquot to become unused */ struct super_block *dq_sb; /* superblock this applies to */ struct kqid dq_id; /* ID this applies to (uid, gid, projid) */ loff_t dq_off; /* Offset of dquot on disk */ unsigned long dq_flags; /* See DQ_* */ struct mem_dqblk dq_dqb; /* Diskquota usage */ }; /* Operations which must be implemented by each quota format */ struct quota_format_ops { int (*check_quota_file)(struct super_block *sb, int type); /* Detect whether file is in our format */ int (*read_file_info)(struct super_block *sb, int type); /* Read main info about file - called on quotaon() */ int (*write_file_info)(struct super_block *sb, int type); /* Write main info about file */ int (*free_file_info)(struct super_block *sb, int type); /* Called on quotaoff() */ int (*read_dqblk)(struct dquot *dquot); /* Read structure for one user */ int (*commit_dqblk)(struct dquot *dquot); /* Write structure for one user */ int (*release_dqblk)(struct dquot *dquot); /* Called when last reference to dquot is being dropped */ int (*get_next_id)(struct super_block *sb, struct kqid *qid); /* Get next ID with existing structure in the quota file */ }; /* Operations working with dquots */ struct dquot_operations { int (*write_dquot) (struct dquot *); /* Ordinary dquot write */ struct dquot *(*alloc_dquot)(struct super_block *, int); /* Allocate memory for new dquot */ void (*destroy_dquot)(struct dquot *); /* Free memory for dquot */ int (*acquire_dquot) (struct dquot *); /* Quota is going to be created on disk */ int (*release_dquot) (struct dquot *); /* Quota is going to be deleted from disk */ int (*mark_dirty) (struct dquot *); /* Dquot is marked dirty */ int (*write_info) (struct super_block *, int); /* Write of quota "superblock" */ /* get reserved quota for delayed alloc, value returned is managed by * quota code only */ qsize_t *(*get_reserved_space) (struct inode *); int (*get_projid) (struct inode *, kprojid_t *);/* Get project ID */ /* Get next ID with active quota structure */ int (*get_next_id) (struct super_block *sb, struct kqid *qid); }; struct path; /* Structure for communicating via ->get_dqblk() & ->set_dqblk() */ struct qc_dqblk { int d_fieldmask; /* mask of fields to change in ->set_dqblk() */ u64 d_spc_hardlimit; /* absolute limit on used space */ u64 d_spc_softlimit; /* preferred limit on used space */ u64 d_ino_hardlimit; /* maximum # allocated inodes */ u64 d_ino_softlimit; /* preferred inode limit */ u64 d_space; /* Space owned by the user */ u64 d_ino_count; /* # inodes owned by the user */ s64 d_ino_timer; /* zero if within inode limits */ /* if not, we refuse service */ s64 d_spc_timer; /* similar to above; for space */ int d_ino_warns; /* # warnings issued wrt num inodes */ int d_spc_warns; /* # warnings issued wrt used space */ u64 d_rt_spc_hardlimit; /* absolute limit on realtime space */ u64 d_rt_spc_softlimit; /* preferred limit on RT space */ u64 d_rt_space; /* realtime space owned */ s64 d_rt_spc_timer; /* similar to above; for RT space */ int d_rt_spc_warns; /* # warnings issued wrt RT space */ }; /* * Field specifiers for ->set_dqblk() in struct qc_dqblk and also for * ->set_info() in struct qc_info */ #define QC_INO_SOFT (1<<0) #define QC_INO_HARD (1<<1) #define QC_SPC_SOFT (1<<2) #define QC_SPC_HARD (1<<3) #define QC_RT_SPC_SOFT (1<<4) #define QC_RT_SPC_HARD (1<<5) #define QC_LIMIT_MASK (QC_INO_SOFT | QC_INO_HARD | QC_SPC_SOFT | QC_SPC_HARD | \ QC_RT_SPC_SOFT | QC_RT_SPC_HARD) #define QC_SPC_TIMER (1<<6) #define QC_INO_TIMER (1<<7) #define QC_RT_SPC_TIMER (1<<8) #define QC_TIMER_MASK (QC_SPC_TIMER | QC_INO_TIMER | QC_RT_SPC_TIMER) #define QC_SPC_WARNS (1<<9) #define QC_INO_WARNS (1<<10) #define QC_RT_SPC_WARNS (1<<11) #define QC_WARNS_MASK (QC_SPC_WARNS | QC_INO_WARNS | QC_RT_SPC_WARNS) #define QC_SPACE (1<<12) #define QC_INO_COUNT (1<<13) #define QC_RT_SPACE (1<<14) #define QC_ACCT_MASK (QC_SPACE | QC_INO_COUNT | QC_RT_SPACE) #define QC_FLAGS (1<<15) #define QCI_SYSFILE (1 << 0) /* Quota file is hidden from userspace */ #define QCI_ROOT_SQUASH (1 << 1) /* Root squash turned on */ #define QCI_ACCT_ENABLED (1 << 2) /* Quota accounting enabled */ #define QCI_LIMITS_ENFORCED (1 << 3) /* Quota limits enforced */ /* Structures for communicating via ->get_state */ struct qc_type_state { unsigned int flags; /* Flags QCI_* */ unsigned int spc_timelimit; /* Time after which space softlimit is * enforced */ unsigned int ino_timelimit; /* Ditto for inode softlimit */ unsigned int rt_spc_timelimit; /* Ditto for real-time space */ unsigned int spc_warnlimit; /* Limit for number of space warnings */ unsigned int ino_warnlimit; /* Ditto for inodes */ unsigned int rt_spc_warnlimit; /* Ditto for real-time space */ unsigned long long ino; /* Inode number of quota file */ blkcnt_t blocks; /* Number of 512-byte blocks in the file */ blkcnt_t nextents; /* Number of extents in the file */ }; struct qc_state { unsigned int s_incoredqs; /* Number of dquots in core */ /* * Per quota type information. The array should really have * max(MAXQUOTAS, XQM_MAXQUOTAS) entries. BUILD_BUG_ON in * quota_getinfo() makes sure XQM_MAXQUOTAS is large enough. Once VFS * supports project quotas, this can be changed to MAXQUOTAS */ struct qc_type_state s_state[XQM_MAXQUOTAS]; }; /* Structure for communicating via ->set_info */ struct qc_info { int i_fieldmask; /* mask of fields to change in ->set_info() */ unsigned int i_flags; /* Flags QCI_* */ unsigned int i_spc_timelimit; /* Time after which space softlimit is * enforced */ unsigned int i_ino_timelimit; /* Ditto for inode softlimit */ unsigned int i_rt_spc_timelimit;/* Ditto for real-time space */ unsigned int i_spc_warnlimit; /* Limit for number of space warnings */ unsigned int i_ino_warnlimit; /* Limit for number of inode warnings */ unsigned int i_rt_spc_warnlimit; /* Ditto for real-time space */ }; /* Operations handling requests from userspace */ struct quotactl_ops { int (*quota_on)(struct super_block *, int, int, const struct path *); int (*quota_off)(struct super_block *, int); int (*quota_enable)(struct super_block *, unsigned int); int (*quota_disable)(struct super_block *, unsigned int); int (*quota_sync)(struct super_block *, int); int (*set_info)(struct super_block *, int, struct qc_info *); int (*get_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *); int (*get_nextdqblk)(struct super_block *, struct kqid *, struct qc_dqblk *); int (*set_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *); int (*get_state)(struct super_block *, struct qc_state *); int (*rm_xquota)(struct super_block *, unsigned int); }; struct quota_format_type { int qf_fmt_id; /* Quota format id */ const struct quota_format_ops *qf_ops; /* Operations of format */ struct module *qf_owner; /* Module implementing quota format */ struct quota_format_type *qf_next; }; /** * Quota state flags - they actually come in two flavors - for users and groups. * * Actual typed flags layout: * USRQUOTA GRPQUOTA * DQUOT_USAGE_ENABLED 0x0001 0x0002 * DQUOT_LIMITS_ENABLED 0x0004 0x0008 * DQUOT_SUSPENDED 0x0010 0x0020 * * Following bits are used for non-typed flags: * DQUOT_QUOTA_SYS_FILE 0x0040 * DQUOT_NEGATIVE_USAGE 0x0080 */ enum { _DQUOT_USAGE_ENABLED = 0, /* Track disk usage for users */ _DQUOT_LIMITS_ENABLED, /* Enforce quota limits for users */ _DQUOT_SUSPENDED, /* User diskquotas are off, but * we have necessary info in * memory to turn them on */ _DQUOT_STATE_FLAGS }; #define DQUOT_USAGE_ENABLED (1 << _DQUOT_USAGE_ENABLED * MAXQUOTAS) #define DQUOT_LIMITS_ENABLED (1 << _DQUOT_LIMITS_ENABLED * MAXQUOTAS) #define DQUOT_SUSPENDED (1 << _DQUOT_SUSPENDED * MAXQUOTAS) #define DQUOT_STATE_FLAGS (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED | \ DQUOT_SUSPENDED) /* Other quota flags */ #define DQUOT_STATE_LAST (_DQUOT_STATE_FLAGS * MAXQUOTAS) #define DQUOT_QUOTA_SYS_FILE (1 << DQUOT_STATE_LAST) /* Quota file is a special * system file and user cannot * touch it. Filesystem is * responsible for setting * S_NOQUOTA, S_NOATIME flags */ #define DQUOT_NEGATIVE_USAGE (1 << (DQUOT_STATE_LAST + 1)) /* Allow negative quota usage */
static inline unsigned int dquot_state_flag(unsigned int flags, int type) { return flags << type; }

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Jan Kara1995.00%150.00%
Dmitriy Monakhov15.00%150.00%
Total20100.00%2100.00%


static inline unsigned int dquot_generic_flag(unsigned int flags, int type) { return (flags >> type) & DQUOT_STATE_FLAGS; }

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Jan Kara1979.17%150.00%
Dmitriy Monakhov520.83%150.00%
Total24100.00%2100.00%

/* Bitmap of quota types where flag is set in flags */
static __always_inline unsigned dquot_state_types(unsigned flags, unsigned flag) { BUILD_BUG_ON_NOT_POWER_OF_2(flag); return (flags / flag) & ((1 << MAXQUOTAS) - 1); }

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Konstantin Khlebnikov35100.00%1100.00%
Total35100.00%1100.00%

#ifdef CONFIG_QUOTA_NETLINK_INTERFACE extern void quota_send_warning(struct kqid qid, dev_t dev, const char warntype); #else
static inline void quota_send_warning(struct kqid qid, dev_t dev, const char warntype) { return; }

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Steven Whitehouse1684.21%150.00%
Eric W. Biedermann315.79%150.00%
Total19100.00%2100.00%

#endif /* CONFIG_QUOTA_NETLINK_INTERFACE */ struct quota_info { unsigned int flags; /* Flags for diskquotas on this device */ struct mutex dqio_mutex; /* lock device while I/O in progress */ struct inode *files[MAXQUOTAS]; /* inodes of quotafiles */ struct mem_dqinfo info[MAXQUOTAS]; /* Information for each quota type */ const struct quota_format_ops *ops[MAXQUOTAS]; /* Operations for each type */ }; int register_quota_format(struct quota_format_type *fmt); void unregister_quota_format(struct quota_format_type *fmt); struct quota_module_name { int qm_fmt_id; char *qm_mod_name; }; #define INIT_QUOTA_MODULE_NAMES {\ {QFMT_VFS_OLD, "quota_v1"},\ {QFMT_VFS_V0, "quota_v2"},\ {QFMT_VFS_V1, "quota_v2"},\ {0, NULL}} #endif /* _QUOTA_ */

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Jan Kara90849.19%3242.67%
Eric W. Biedermann41122.26%56.67%
Andrew Morton1518.18%810.67%
Dmitriy Monakhov995.36%45.33%
Linus Torvalds (pre-git)764.12%45.33%
Konstantin Khlebnikov402.17%11.33%
Steven Whitehouse372.00%11.33%
Eric Sandeen331.79%22.67%
Li Xi180.98%11.33%
Mingming Cao150.81%22.67%
Chandra Seetharaman130.70%11.33%
Matthew Wilcox100.54%11.33%
Linus Torvalds60.33%11.33%
Andrew Perepechko40.22%11.33%
Mike Frysinger40.22%11.33%
David Woodhouse40.22%11.33%
Robert P. J. Day30.16%11.33%
David Howells30.16%11.33%
Ingo Molnar30.16%11.33%
Alexey Dobriyan20.11%11.33%
Arnd Bergmann20.11%11.33%
Arun Sharma10.05%11.33%
Theodore Y. Ts'o10.05%11.33%
Al Viro10.05%11.33%
Adrian Bunk10.05%11.33%
Total1846100.00%75100.00%
Directory: include/linux
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